4 This directory contains Device Tree overlays. Device Tree makes it possible
5 to support many hardware configurations with a single kernel and without the
6 need to explicitly load or blacklist kernel modules. Note that this isn't a
7 "pure" Device Tree configuration (c.f. MACH_BCM2835) - some on-board devices
8 are still configured by the board support code, but the intention is to
9 eventually reach that goal.
11 On Raspberry Pi, Device Tree usage is controlled from /boot/config.txt. By
12 default, the Raspberry Pi kernel boots with device tree enabled. You can
13 completely disable DT usage (for now) by adding:
17 to your config.txt, which should cause your Pi to revert to the old way of
18 doing things after a reboot.
20 In /boot you will find a .dtb for each base platform. This describes the
21 hardware that is part of the Raspberry Pi board. The loader (start.elf and its
22 siblings) selects the .dtb file appropriate for the platform by name, and reads
23 it into memory. At this point, all of the optional interfaces (i2c, i2s, spi)
24 are disabled, but they can be enabled using Device Tree parameters:
26 dtparam=i2c=on,i2s=on,spi=on
28 However, this shouldn't be necessary in many use cases because loading an
29 overlay that requires one of those interfaces will cause it to be enabled
30 automatically, and it is advisable to only enable interfaces if they are
33 Configuring additional, optional hardware is done using Device Tree overlays
36 GPIO numbering uses the hardware pin numbering scheme (aka BCM scheme) and
37 not the physical pin numbers.
42 The Advanced Options section of the raspi-config utility can enable and disable
43 Device Tree use, as well as toggling the I2C and SPI interfaces. Note that it
44 is possible to both enable an interface and blacklist the driver, if for some
45 reason you should want to defer the loading.
50 As well as describing the hardware, Device Tree also gives enough information
51 to allow suitable driver modules to be located and loaded, with the corollary
52 that unneeded modules are not loaded. As a result it should be possible to
53 remove lines from /etc/modules, and /etc/modprobe.d/raspi-blacklist.conf can
54 have its contents deleted (or commented out).
59 Overlays are loaded using the "dtoverlay" config.txt setting. As an example,
60 consider I2C Real Time Clock drivers. In the pre-DT world these would be loaded
61 by writing a magic string comprising a device identifier and an I2C address to
62 a special file in /sys/class/i2c-adapter, having first loaded the driver for
63 the I2C interface and the RTC device - something like this:
67 echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
69 With DT enabled, this becomes a line in config.txt:
71 dtoverlay=i2c-rtc,ds1307
73 This causes the file /boot/overlays/i2c-rtc.dtbo to be loaded and a "node"
74 describing the DS1307 I2C device to be added to the Device Tree for the Pi. By
75 default it usees address 0x68, but this can be modified with an additional DT
78 dtoverlay=i2c-rtc,ds1307,addr=0x68
80 Parameters usually have default values, although certain parameters are
81 mandatory. See the list of overlays below for a description of the parameters
84 Making new Overlays based on existing Overlays
85 ==============================================
87 Recent overlays have been designed in a more general way, so that they can be
88 adapted to hardware by changing their parameters. When you have additional
89 hardware with more than one device of a kind, you end up using the same overlay
90 multiple times with other parameters, e.g.
92 # 2 CAN FD interfaces on spi but with different pins
93 dtoverlay=mcp251xfd,spi0-0,interrupt=25
94 dtoverlay=mcp251xfd,spi0-1,interrupt=24
96 # a realtime clock on i2c
97 dtoverlay=i2c-rtc,pcf85063
99 While this approach does work, it requires knowledge about the hardware design.
100 It is more feasible to simplify things for the end user by providing a single
101 overlay as it is done the traditional way.
103 A new overlay can be generated by using ovmerge utility.
104 https://github.com/raspberrypi/utils/blob/master/ovmerge/ovmerge
106 To generate an overlay for the above configuration we pass the configuration
107 to ovmerge and add the -c flag.
109 ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 \
110 mcp251xfd-overlay.dts,spi0-1,interrupt=24 \
111 i2c-rtc-overlay.dts,pcf85063 \
112 >> merged-overlay.dts
114 The -c option writes the command above as a comment into the overlay as
115 a marker that this overlay is generated and how it was generated.
116 After compiling the overlay it can be loaded in a single line.
120 It does the same as the original configuration but without parameters.
122 The Overlay and Parameter Reference
123 ===================================
125 N.B. When editing this file, please preserve the indentation levels to make it
126 simple to parse programmatically. NO HARD TABS.
130 Info: Configures the base Raspberry Pi hardware
131 Load: <loaded automatically>
133 ant1 Select antenna 1 (default). CM4 only.
135 ant2 Select antenna 2. CM4 only.
137 noant Disable both antennas. CM4 only.
139 audio Set to "on" to enable the onboard ALSA audio
140 interface (default "off")
142 axiperf Set to "on" to enable the AXI bus performance
144 See /sys/kernel/debug/raspberrypi_axi_monitor
147 bdaddr Set an alternative Bluetooth address (BDADDR).
148 The value should be a 6-byte hexadecimal value,
149 with or without colon separators, written least-
150 significant-byte first. For example,
151 bdaddr=06:05:04:03:02:01
152 will set the BDADDR to 01:02:03:04:05:06.
154 button_debounce Set the debounce delay (in ms) on the power/
155 shutdown button (default 50ms)
157 cam0_reg Enables CAM 0 regulator.
158 Only required on CM1 & 3.
160 cam0_reg_gpio Set GPIO for CAM 0 regulator.
161 Default 31 on CM1, 3, and 4S.
162 Default of GPIO expander 5 on CM4, but override
163 switches to normal GPIO.
165 cam1_reg Enables CAM 1 regulator.
166 Only required on CM1 & 3.
168 cam1_reg_gpio Set GPIO for CAM 1 regulator.
169 Default 3 on CM1, 3, and 4S.
170 Default of GPIO expander 5 on CM4, but override
171 switches to normal GPIO.
173 cooling_fan Enables the Pi 5 cooling fan (enabled
174 automatically by the firmware)
176 drm_fb0_rp1_dpi Assign /dev/fb0 to the RP1 DPI output
178 drm_fb0_rp1_dsi0 Assign /dev/fb0 to the RP1 DSI0 output
180 drm_fb0_rp1_dsi1 Assign /dev/fb0 to the RP1 DSI1 output
182 drm_fb0_vc4 Assign /dev/fb0 to the vc4 outputs
184 drm_fb1_rp1_dpi Assign /dev/fb1 to the RP1 DPI output
186 drm_fb1_rp1_dsi0 Assign /dev/fb1 to the RP1 DSI0 output
188 drm_fb1_rp1_dsi1 Assign /dev/fb1 to the RP1 DSI1 output
190 drm_fb1_vc4 Assign /dev/fb1 to the vc4 outputs
192 drm_fb2_rp1_dpi Assign /dev/fb2 to the RP1 DPI output
194 drm_fb2_rp1_dsi0 Assign /dev/fb2 to the RP1 DSI0 output
196 drm_fb2_rp1_dsi1 Assign /dev/fb2 to the RP1 DSI1 output
198 drm_fb2_vc4 Assign /dev/fb2 to the vc4 outputs
200 eee Enable Energy Efficient Ethernet support for
201 compatible devices (default "on"). See also
202 "tx_lpi_timer". Pi3B+ only.
204 eth_downshift_after Set the number of auto-negotiation failures
205 after which the 1000Mbps modes are disabled.
206 Legal values are 2, 3, 4, 5 and 0, where
207 0 means never downshift (default 2). Pi3B+ only.
209 eth_led0 Set mode of LED0 - amber on Pi3B+ (default "1"),
210 green on Pi4 (default "0").
211 The legal values are:
215 0=link/activity 1=link1000/activity
216 2=link100/activity 3=link10/activity
217 4=link100/1000/activity 5=link10/1000/activity
218 6=link10/100/activity 14=off 15=on
222 0=Speed/Activity 1=Speed
223 2=Flash activity 3=FDX
228 eth_led1 Set mode of LED1 - green on Pi3B+ (default "6"),
229 amber on Pi4 (default "8"). See eth_led0 for
232 eth_max_speed Set the maximum speed a link is allowed
233 to negotiate. Legal values are 10, 100 and
234 1000 (default 1000). Pi3B+ only.
236 hdmi Set to "off" to disable the HDMI interface
239 i2c An alias for i2c_arm
241 i2c_arm Set to "on" to enable the ARM's i2c interface
244 i2c_arm_baudrate Set the baudrate of the ARM's i2c interface
247 i2c_baudrate An alias for i2c_arm_baudrate
249 i2c_csi_dsi Set to "on" to enable the i2c_csi_dsi interface
251 i2c_csi_dsi0 Set to "on" to enable the i2c_csi_dsi0 interface
253 i2c_csi_dsi1 Set to "on" to enable the i2c_csi_dsi1 interface
255 i2c_vc Set to "on" to enable the i2c interface
256 usually reserved for the VideoCore processor
259 i2c_vc_baudrate Set the baudrate of the VideoCore i2c interface
262 i2s Set to "on" to enable the i2s interface
265 i2s_dma4 Use to enable 40-bit DMA on the i2s interface
266 (the assigned value doesn't matter)
269 krnbt Set to "off" to disable autoprobing of Bluetooth
270 driver without need of hciattach/btattach
273 krnbt_baudrate Set the baudrate of the PL011 UART when used
276 nvme Alias for "pciex1" (2712 only)
278 pcie Set to "off" to disable the PCIe interface
280 (2711 only, but not applicable on CM4S)
281 N.B. USB-A ports on 4B are subsequently disabled
283 pcie_tperst_clk_ms Add N milliseconds between PCIe reference clock
284 activation and PERST# deassertion
285 (CM4 and 2712, default "0")
287 pciex1 Set to "on" to enable the external PCIe link
288 (2712 only, default "off")
290 pciex1_gen Sets the PCIe "GEN"/speed for the external PCIe
291 link (2712 only, default "2")
293 pciex1_no_l0s Set to "on" to disable ASPM L0s on the external
294 PCIe link for devices that have broken
295 implementations (2712 only, default "off")
297 pciex1_tperst_clk_ms Alias for pcie_tperst_clk_ms
298 (2712 only, default "0")
300 spi Set to "on" to enable the spi interfaces
303 spi_dma4 Use to enable 40-bit DMA on spi interfaces
304 (the assigned value doesn't matter)
307 random Set to "on" to enable the hardware random
308 number generator (default "on")
310 rtc_bbat_vchg Set the RTC backup battery charging voltage in
311 microvolts. If set to 0 or not specified, the
312 trickle charger is disabled.
313 (2712 only, default "0")
315 sd Set to "off" to disable the SD card (or eMMC on
316 non-lite SKU of CM4).
319 sd_overclock Clock (in MHz) to use when the MMC framework
322 sd_poll_once Looks for a card once after booting. Useful
323 for network booting scenarios to avoid the
324 overhead of continuous polling. N.B. Using
325 this option restricts the system to using a
326 single card per boot (or none at all).
329 sd_force_pio Disable DMA support for SD driver (default off)
331 sd_pio_limit Number of blocks above which to use DMA for
334 sd_debug Enable debug output from SD driver (default off)
336 sdio_overclock Clock (in MHz) to use when the MMC framework
337 requests 50MHz for the SDIO/WLAN interface.
339 suspend Make the power button trigger a suspend rather
340 than a power-off (2712 only, default "off")
342 tx_lpi_timer Set the delay in microseconds between going idle
343 and entering the low power state (default 600).
344 Requires EEE to be enabled - see "eee".
346 uart0 Set to "off" to disable uart0 (default "on")
348 uart0_console Move the kernel boot console to UART0 on pins
349 6, 8 and 10 of the 40-way header (2712 only,
352 uart1 Set to "on" or "off" to enable or disable uart1
355 watchdog Set to "on" to enable the hardware watchdog
358 wifiaddr Set an alternative WiFi MAC address.
359 The value should be a 6-byte hexadecimal value,
360 with or without colon separators, written in the
361 natural (big-endian) order.
363 act_led_trigger Choose which activity the LED tracks.
364 Use "heartbeat" for a nice load indicator.
367 act_led_activelow Set to "on" to invert the sense of the LED
369 N.B. For Pi 3B, 3B+, 3A+ and 4B, use the act-led
372 act_led_gpio Set which GPIO to use for the activity LED
373 (in case you want to connect it to an external
375 (default "16" on a non-Plus board, "47" on a
377 N.B. For Pi 3B, 3B+, 3A+ and 4B, use the act-led
383 As for act_led_*, but using the PWR LED.
384 Not available on Model A/B boards.
386 N.B. It is recommended to only enable those interfaces that are needed.
387 Leaving all interfaces enabled can lead to unwanted behaviour (i2c_vc
388 interfering with Pi Camera, I2S and SPI hogging GPIO pins, etc.)
389 Note also that i2c, i2c_arm and i2c_vc are aliases for the physical
390 interfaces i2c0 and i2c1. Use of the numeric variants is still possible
391 but deprecated because the ARM/VC assignments differ between board
392 revisions. The same board-specific mapping applies to i2c_baudrate,
393 and the other i2c baudrate parameters.
397 Info: Pi 3B, 3B+, 3A+ and 4B use a GPIO expander to drive the LEDs which can
398 only be accessed from the VPU. There is a special driver for this with a
399 separate DT node, which has the unfortunate consequence of breaking the
400 act_led_gpio and act_led_activelow dtparams.
401 This overlay changes the GPIO controller back to the standard one and
402 restores the dtparams.
403 Load: dtoverlay=act-led,<param>=<val>
404 Params: activelow Set to "on" to invert the sense of the LED
407 gpio Set which GPIO to use for the activity LED
408 (in case you want to connect it to an external
413 Name: adafruit-st7735r
414 Info: Overlay for the SPI-connected Adafruit 1.8" 160x128 or 128x128 displays,
415 based on the ST7735R chip.
416 This overlay uses the newer DRM/KMS "Tiny" driver.
417 Load: dtoverlay=adafruit-st7735r,<param>=<val>
418 Params: 128x128 Select the 128x128 driver (default 160x128)
419 rotate Display rotation {0,90,180,270} (default 90)
420 speed SPI bus speed in Hz (default 4000000)
421 dc_pin GPIO pin for D/C (default 24)
422 reset_pin GPIO pin for RESET (default 25)
423 led_pin GPIO used to control backlight (default 18)
427 Info: Overlay for the SPI-connected Adafruit 1.8" display (based on the
428 ST7735R chip). It includes support for the "green tab" version.
429 This overlay uses the older fbtft driver.
430 Load: dtoverlay=adafruit18,<param>=<val>
431 Params: green Use the adafruit18_green variant.
432 rotate Display rotation {0,90,180,270}
433 speed SPI bus speed in Hz (default 4000000)
434 fps Display frame rate in Hz
435 bgr Enable BGR mode (default off)
436 debug Debug output level {0-7}
437 dc_pin GPIO pin for D/C (default 24)
438 reset_pin GPIO pin for RESET (default 25)
439 led_pin GPIO used to control backlight (default 18)
443 Info: Overlay for activation of ADAU1977 ADC codec over I2C for control
445 Load: dtoverlay=adau1977-adc
449 Name: adau7002-simple
450 Info: Overlay for the activation of ADAU7002 stereo PDM to I2S converter.
451 Load: dtoverlay=adau7002-simple,<param>=<val>
452 Params: card-name Override the default, "adau7002", card name.
456 Info: Overlay for activation of Texas Instruments ADS1015 ADC over I2C
457 Load: dtoverlay=ads1015,<param>=<val>
458 Params: addr I2C bus address of device. Set based on how the
459 addr pin is wired. (default=0x48 assumes addr
461 cha_enable Enable virtual channel a. (default=true)
462 cha_cfg Set the configuration for virtual channel a.
463 (default=4 configures this channel for the
464 voltage at A0 with respect to GND)
465 cha_datarate Set the datarate (samples/sec) for this channel.
466 (default=4 sets 1600 sps)
467 cha_gain Set the gain of the Programmable Gain
468 Amplifier for this channel. (default=2 sets the
469 full scale of the channel to 2.048 Volts)
471 Channel (ch) parameters can be set for each enabled channel.
472 A maximum of 4 channels can be enabled (letters a thru d).
473 For more information refer to the device datasheet at:
474 http://www.ti.com/lit/ds/symlink/ads1015.pdf
478 Info: Texas Instruments ADS1115 ADC
479 Load: dtoverlay=ads1115,<param>[=<val>]
480 Params: addr I2C bus address of device. Set based on how the
481 addr pin is wired. (default=0x48 assumes addr
483 cha_enable Enable virtual channel a.
484 cha_cfg Set the configuration for virtual channel a.
485 (default=4 configures this channel for the
486 voltage at A0 with respect to GND)
487 cha_datarate Set the datarate (samples/sec) for this channel.
488 (default=7 sets 860 sps)
489 cha_gain Set the gain of the Programmable Gain
490 Amplifier for this channel. (Default 1 sets the
491 full scale of the channel to 4.096 Volts)
493 Channel parameters can be set for each enabled channel.
494 A maximum of 4 channels can be enabled (letters a thru d).
495 For more information refer to the device datasheet at:
496 http://www.ti.com/lit/ds/symlink/ads1115.pdf
500 Info: ADS7846 Touch controller
501 Load: dtoverlay=ads7846,<param>=<val>
502 Params: cs SPI bus Chip Select (default 1)
503 speed SPI bus speed (default 2MHz, max 3.25MHz)
504 penirq GPIO used for PENIRQ. REQUIRED
505 penirq_pull Set GPIO pull (default 0=none, 2=pullup)
506 swapxy Swap x and y axis
507 xmin Minimum value on the X axis (default 0)
508 ymin Minimum value on the Y axis (default 0)
509 xmax Maximum value on the X axis (default 4095)
510 ymax Maximum value on the Y axis (default 4095)
511 pmin Minimum reported pressure value (default 0)
512 pmax Maximum reported pressure value (default 65535)
513 xohms Touchpanel sensitivity (X-plate resistance)
516 penirq is required and usually xohms (60-100) has to be set as well.
517 Apart from that, pmax (255) and swapxy are also common.
518 The rest of the calibration can be done with xinput-calibrator.
519 See: github.com/notro/fbtft/wiki/FBTFT-on-Raspian
520 Device Tree binding document:
521 www.kernel.org/doc/Documentation/devicetree/bindings/input/ads7846.txt
525 Info: Analog Devices ADV7282M analogue video to CSI2 bridge.
526 Uses Unicam1, which is the standard camera connector on most Pi
528 Load: dtoverlay=adv7282m,<param>=<val>
529 Params: addr Overrides the I2C address (default 0x21)
530 media-controller Configure use of Media Controller API for
531 configuring the sensor (default off)
535 Info: Analog Devices ADV728[0|1|2]-M analogue video to CSI2 bridges.
536 This is a wrapper for adv7282m, and defaults to ADV7282M.
537 Load: dtoverlay=adv728x-m,<param>=<val>
538 Params: addr Overrides the I2C address (default 0x21)
539 adv7280m Select ADV7280-M.
540 adv7281m Select ADV7281-M.
541 adv7281ma Select ADV7281-MA.
542 media-controller Configure use of Media Controller API for
543 configuring the sensor (default off)
546 Name: akkordion-iqdacplus
547 Info: Configures the Digital Dreamtime Akkordion Music Player (based on the
548 OEM IQAudIO DAC+ or DAC Zero module).
549 Load: dtoverlay=akkordion-iqdacplus,<param>=<val>
550 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
551 Digital volume control. Enable with
552 dtoverlay=akkordion-iqdacplus,24db_digital_gain
553 (The default behaviour is that the Digital
554 volume control is limited to a maximum of
555 0dB. ie. it can attenuate but not provide
556 gain. For most users, this will be desired
557 as it will prevent clipping. By appending
558 the 24db_digital_gain parameter, the Digital
559 volume control will allow up to 24dB of
560 gain. If this parameter is enabled, it is the
561 responsibility of the user to ensure that
562 the Digital volume control is set to a value
563 that does not result in clipping/distortion!)
566 Name: allo-boss-dac-pcm512x-audio
567 Info: Configures the Allo Boss DAC audio cards.
568 Load: dtoverlay=allo-boss-dac-pcm512x-audio,<param>
569 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
570 Digital volume control. Enable with
571 "dtoverlay=allo-boss-dac-pcm512x-audio,
573 (The default behaviour is that the Digital
574 volume control is limited to a maximum of
575 0dB. ie. it can attenuate but not provide
576 gain. For most users, this will be desired
577 as it will prevent clipping. By appending
578 the 24db_digital_gain parameter, the Digital
579 volume control will allow up to 24dB of
580 gain. If this parameter is enabled, it is the
581 responsibility of the user to ensure that
582 the Digital volume control is set to a value
583 that does not result in clipping/distortion!)
584 slave Force Boss DAC into slave mode, using Pi a
585 master for bit clock and frame clock. Enable
586 with "dtoverlay=allo-boss-dac-pcm512x-audio,
590 Name: allo-boss2-dac-audio
591 Info: Configures the Allo Boss2 DAC audio card
592 Load: dtoverlay=allo-boss2-dac-audio
597 Info: Configures the Allo Digione audio card
598 Load: dtoverlay=allo-digione
602 Name: allo-katana-dac-audio
603 Info: Configures the Allo Katana DAC audio card
604 Load: dtoverlay=allo-katana-dac-audio
608 Name: allo-piano-dac-pcm512x-audio
609 Info: Configures the Allo Piano DAC (2.0/2.1) audio cards.
610 (NB. This initial support is for 2.0 channel audio ONLY! ie. stereo.
611 The subwoofer outputs on the Piano 2.1 are not currently supported!)
612 Load: dtoverlay=allo-piano-dac-pcm512x-audio,<param>
613 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
614 Digital volume control.
615 (The default behaviour is that the Digital
616 volume control is limited to a maximum of
617 0dB. ie. it can attenuate but not provide
618 gain. For most users, this will be desired
619 as it will prevent clipping. By appending
620 the 24db_digital_gain parameter, the Digital
621 volume control will allow up to 24dB of
622 gain. If this parameter is enabled, it is the
623 responsibility of the user to ensure that
624 the Digital volume control is set to a value
625 that does not result in clipping/distortion!)
628 Name: allo-piano-dac-plus-pcm512x-audio
629 Info: Configures the Allo Piano DAC (2.1) audio cards.
630 Load: dtoverlay=allo-piano-dac-plus-pcm512x-audio,<param>
631 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
632 Digital volume control.
633 (The default behaviour is that the Digital
634 volume control is limited to a maximum of
635 0dB. ie. it can attenuate but not provide
636 gain. For most users, this will be desired
637 as it will prevent clipping. By appending
638 the 24db_digital_gain parameter, the Digital
639 volume control will allow up to 24dB of
640 gain. If this parameter is enabled, it is the
641 responsibility of the user to ensure that
642 the Digital volume control is set to a value
643 that does not result in clipping/distortion!)
644 glb_mclk This option is only with Kali board. If enabled,
645 MCLK for Kali is used and PLL is disabled for
646 better voice quality. (default Off)
650 Info: Universal device tree overlay for SPI devices
652 Just specify the SPI address and device name ("compatible" property).
653 This overlay lacks any device-specific parameter support!
655 For devices on spi1 or spi2, the interfaces should be enabled
656 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
659 1. SPI NOR flash on spi0.1, maximum SPI clock frequency 45MHz:
660 dtoverlay=anyspi:spi0-1,dev="jedec,spi-nor",speed=45000000
661 2. MCP3204 ADC on spi1.2, maximum SPI clock frequency 500kHz:
662 dtoverlay=anyspi:spi1-2,dev="microchip,mcp3204"
663 Load: dtoverlay=anyspi,<param>=<val>
664 Params: spi<n>-<m> Configure device at spi<n>, cs<m>
666 dev Set device name to search compatible module
668 speed Set SPI clock frequency in Hz
669 (integer, optional, default 500000)
673 Info: Configures the AVAGO APDS9960 digital proximity, ambient light, RGB and
675 Load: dtoverlay=apds9960,<param>=<val>
676 Params: gpiopin GPIO used for INT (default 4)
677 noints Disable the interrupt GPIO line.
681 Info: Configures the Orchard Audio ApplePi-DAC audio card
682 Load: dtoverlay=applepi-dac
687 Info: Arducam 64MP camera module.
688 Uses Unicam 1, which is the standard camera connector on most Pi
690 Load: dtoverlay=arducam-64mp,<param>=<val>
691 Params: rotation Mounting rotation of the camera sensor (0 or
693 orientation Sensor orientation (0 = front, 1 = rear,
694 2 = external, default external)
695 media-controller Configure use of Media Controller API for
696 configuring the sensor (default on)
697 cam0 Adopt the default configuration for CAM0 on a
698 Compute Module (CSI0, i2c_vc, and cam0_reg).
699 vcm Select lens driver state. Default is enabled,
700 but vcm=off will disable.
703 Name: arducam-pivariety
704 Info: Arducam Pivariety camera module.
705 Uses Unicam 1, which is the standard camera connector on most Pi
707 Load: dtoverlay=arducam-pivariety,<param>=<val>
708 Params: rotation Mounting rotation of the camera sensor (0 or
710 orientation Sensor orientation (0 = front, 1 = rear,
711 2 = external, default external)
712 media-controller Configure use of Media Controller API for
713 configuring the sensor (default on)
714 cam0 Adopt the default configuration for CAM0 on a
715 Compute Module (CSI0, i2c_vc, and cam0_reg).
719 Info: Configures the Atmel AT86RF233 802.15.4 low-power WPAN transceiver,
721 Load: dtoverlay=at86rf233,<param>=<val>
722 Params: interrupt GPIO used for INT (default 23)
723 reset GPIO used for Reset (default 24)
724 sleep GPIO used for Sleep (default 25)
725 speed SPI bus speed in Hz (default 3000000)
726 trim Fine tuning of the internal capacitance
727 arrays (0=+0pF, 15=+4.5pF, default 15)
730 Name: audioinjector-addons
731 Info: Configures the audioinjector.net audio add on soundcards
732 Load: dtoverlay=audioinjector-addons,<param>=<val>
733 Params: non-stop-clocks Keeps the clocks running even when the stream
734 is paused or stopped (default off)
737 Name: audioinjector-bare-i2s
738 Info: Configures the audioinjector.net audio bare i2s soundcard
739 Load: dtoverlay=audioinjector-bare-i2s
743 Name: audioinjector-isolated-soundcard
744 Info: Configures the audioinjector.net isolated soundcard
745 Load: dtoverlay=audioinjector-isolated-soundcard
749 Name: audioinjector-ultra
750 Info: Configures the audioinjector.net ultra soundcard
751 Load: dtoverlay=audioinjector-ultra
755 Name: audioinjector-wm8731-audio
756 Info: Configures the audioinjector.net audio add on soundcard
757 Load: dtoverlay=audioinjector-wm8731-audio
762 Info: Configures the audiosense-pi add on soundcard
763 For more information refer to
764 https://gitlab.com/kakar0t/audiosense-pi
765 Load: dtoverlay=audiosense-pi
770 Info: Switches PWM sound output to GPIOs on the 40-pin header
771 Load: dtoverlay=audremap,<param>=<val>
772 Params: swap_lr Reverse the channel allocation, which will also
773 swap the audio jack outputs (default off)
774 enable_jack Don't switch off the audio jack output. Does
775 nothing on BCM2711 (default off)
776 pins_12_13 Select GPIOs 12 & 13 (default)
777 pins_18_19 Select GPIOs 18 & 19
778 pins_40_41 Select GPIOs 40 & 41 (not available on CM4, used
780 pins_40_45 Select GPIOs 40 & 45 (don't use on BCM2711 - the
781 pins are on different controllers)
785 Info: Overlay that enables WLAN, Bluetooth and the GPIO expander on the
786 balenaFin carrier board for the Raspberry Pi Compute Module 3/3+ Lite.
787 Load: dtoverlay=balena-fin
791 Name: bmp085_i2c-sensor
792 Info: This overlay is now deprecated - see i2c-sensor
796 Name: camera-mux-2port
797 Info: Configures a 2 port camera multiplexer
798 Note that currently ALL IMX290 modules share a common clock, therefore
799 all modules will need to have the same clock frequency.
800 Load: dtoverlay=camera-mux-2port,<param>=<val>
801 Params: cam0-arducam-64mp Select Arducam64MP for camera on port 0
802 cam0-imx219 Select IMX219 for camera on port 0
803 cam0-imx258 Select IMX258 for camera on port 0
804 cam0-imx290 Select IMX290 for camera on port 0
805 cam0-imx477 Select IMX477 for camera on port 0
806 cam0-imx519 Select IMX519 for camera on port 0
807 cam0-imx708 Select IMX708 for camera on port 0
808 cam0-ov2311 Select OV2311 for camera on port 0
809 cam0-ov5647 Select OV5647 for camera on port 0
810 cam0-ov7251 Select OV7251 for camera on port 0
811 cam0-ov9281 Select OV9281 for camera on port 0
812 cam0-imx290-clk-freq Set clock frequency for an IMX290 on port 0
813 cam1-arducam-64mp Select Arducam64MP for camera on port 1
814 cam1-imx219 Select IMX219 for camera on port 1
815 cam1-imx258 Select IMX258 for camera on port 1
816 cam1-imx290 Select IMX290 for camera on port 1
817 cam1-imx477 Select IMX477 for camera on port 1
818 cam1-imx519 Select IMX519 for camera on port 1
819 cam1-imx708 Select IMX708 for camera on port 1
820 cam1-ov2311 Select OV2311 for camera on port 1
821 cam1-ov5647 Select OV5647 for camera on port 1
822 cam1-ov7251 Select OV7251 for camera on port 1
823 cam1-ov9281 Select OV9281 for camera on port 1
824 cam1-imx290-clk-freq Set clock frequency for an IMX290 on port 1
827 Name: camera-mux-4port
828 Info: Configures a 4 port camera multiplexer
829 Note that currently ALL IMX290 modules share a common clock, therefore
830 all modules will need to have the same clock frequency.
831 Load: dtoverlay=camera-mux-4port,<param>=<val>
832 Params: cam0-arducam-64mp Select Arducam64MP for camera on port 0
833 cam0-imx219 Select IMX219 for camera on port 0
834 cam0-imx258 Select IMX258 for camera on port 0
835 cam0-imx290 Select IMX290 for camera on port 0
836 cam0-imx477 Select IMX477 for camera on port 0
837 cam0-imx519 Select IMX519 for camera on port 0
838 cam0-imx708 Select IMX708 for camera on port 0
839 cam0-ov2311 Select OV2311 for camera on port 0
840 cam0-ov5647 Select OV5647 for camera on port 0
841 cam0-ov7251 Select OV7251 for camera on port 0
842 cam0-ov9281 Select OV9281 for camera on port 0
843 cam0-imx290-clk-freq Set clock frequency for an IMX290 on port 0
844 cam1-arducam-64mp Select Arducam64MP for camera on port 1
845 cam1-imx219 Select IMX219 for camera on port 1
846 cam1-imx258 Select IMX258 for camera on port 1
847 cam1-imx290 Select IMX290 for camera on port 1
848 cam1-imx477 Select IMX477 for camera on port 1
849 cam1-imx519 Select IMX519 for camera on port 1
850 cam1-imx708 Select IMX708 for camera on port 1
851 cam1-ov2311 Select OV2311 for camera on port 1
852 cam1-ov5647 Select OV5647 for camera on port 1
853 cam1-ov7251 Select OV7251 for camera on port 1
854 cam1-ov9281 Select OV9281 for camera on port 1
855 cam1-imx290-clk-freq Set clock frequency for an IMX290 on port 1
856 cam2-arducam-64mp Select Arducam64MP for camera on port 2
857 cam2-imx219 Select IMX219 for camera on port 2
858 cam2-imx258 Select IMX258 for camera on port 2
859 cam2-imx290 Select IMX290 for camera on port 2
860 cam2-imx477 Select IMX477 for camera on port 2
861 cam2-imx519 Select IMX519 for camera on port 2
862 cam2-imx708 Select IMX708 for camera on port 2
863 cam2-ov2311 Select OV2311 for camera on port 2
864 cam2-ov5647 Select OV5647 for camera on port 2
865 cam2-ov7251 Select OV7251 for camera on port 2
866 cam2-ov9281 Select OV9281 for camera on port 2
867 cam2-imx290-clk-freq Set clock frequency for an IMX290 on port 2
868 cam3-arducam-64mp Select Arducam64MP for camera on port 3
869 cam3-imx219 Select IMX219 for camera on port 3
870 cam3-imx258 Select IMX258 for camera on port 3
871 cam3-imx290 Select IMX290 for camera on port 3
872 cam3-imx477 Select IMX477 for camera on port 3
873 cam3-imx519 Select IMX519 for camera on port 3
874 cam3-imx708 Select IMX708 for camera on port 3
875 cam3-ov2311 Select OV2311 for camera on port 3
876 cam3-ov5647 Select OV5647 for camera on port 3
877 cam3-ov7251 Select OV7251 for camera on port 3
878 cam3-ov9281 Select OV9281 for camera on port 3
879 cam3-imx290-clk-freq Set clock frequency for an IMX290 on port 3
883 Info: Enables the ability to use the cap1106 touch sensor as a keyboard
884 Load: dtoverlay=cap1106,<param>=<val>
885 Params: int_pin GPIO pin for interrupt signal (default 23)
889 Info: Configures Chip Dip audio cards.
890 Load: dtoverlay=chipdip-dac
895 Info: Configures the Cirrus Logic Audio Card
896 Load: dtoverlay=cirrus-wm5102
901 Info: Largely for Compute Modules 1&3 where the original instructions for
902 adding a camera used GPIOs 0&1 for CAM1 and 28&29 for CAM0, whilst all
903 other platforms use 28&29 (or 44&45) for CAM1.
904 The default assignment through using this overlay is for
905 i2c0 to use 28&29, and i2c10 (aka i2c_csi_dsi) to use 28&29, but the
906 overrides allow this to be changed.
907 Load: dtoverlay=cm-swap-i2c0,<param>=<val>
908 Params: i2c0-gpio0 Use GPIOs 0&1 for i2c0
909 i2c0-gpio28 Use GPIOs 28&29 for i2c0 (default)
910 i2c0-gpio44 Use GPIOs 44&45 for i2c0
911 i2c10-gpio0 Use GPIOs 0&1 for i2c0 (default)
912 i2c10-gpio28 Use GPIOs 28&29 for i2c0
913 i2c10-gpio44 Use GPIOs 44&45 for i2c0
917 Info: Set custom CMA sizes, only use if you know what you are doing, might
918 clash with other overlays like vc4-fkms-v3d and vc4-kms-v3d.
919 Load: dtoverlay=cma,<param>=<val>
920 Params: cma-512 CMA is 512MB (needs 1GB)
921 cma-448 CMA is 448MB (needs 1GB)
922 cma-384 CMA is 384MB (needs 1GB)
923 cma-320 CMA is 320MB (needs 1GB)
924 cma-256 CMA is 256MB (needs 1GB)
925 cma-192 CMA is 192MB (needs 1GB)
929 cma-size CMA size in bytes, 4MB aligned
930 cma-default Use upstream's default value
933 Name: crystalfontz-cfa050_pi_m
934 Info: Configures the Crystalfontz CFA050-PI-M series of Raspberry Pi CM4
935 based modules using the CFA7201280A0_050Tx 7" TFT LCD displays,
936 with or without capacitive touch screen.
937 Requires use of vc4-kms-v3d.
938 Load: dtoverlay=crystalfontz-cfa050_pi_m,<param>=<val>
939 Params: captouch Enable capacitive touch display
943 Info: 8" TFT LCD display and touch panel used by cutiepi.io
944 Load: dtoverlay=cutiepi-panel
949 Info: Configures the dacberry400 add on soundcard
950 Load: dtoverlay=dacberry400
955 Info: Overlay for the DHT11/DHT21/DHT22 humidity/temperature sensors
956 Also sometimes found with the part number(s) AM230x.
957 Load: dtoverlay=dht11,<param>=<val>
958 Params: gpiopin GPIO connected to the sensor's DATA output.
963 Info: Configures the Dion Audio KIWI STREAMER
964 Load: dtoverlay=dionaudio-kiwi
969 Info: Configures the Dion Audio LOCO DAC-AMP
970 Load: dtoverlay=dionaudio-loco
974 Name: dionaudio-loco-v2
975 Info: Configures the Dion Audio LOCO-V2 DAC-AMP
976 Load: dtoverlay=dionaudio-loco-v2,<param>=<val>
977 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
978 Digital volume control. Enable with
979 "dtoverlay=hifiberry-dacplus,24db_digital_gain"
980 (The default behaviour is that the Digital
981 volume control is limited to a maximum of
982 0dB. ie. it can attenuate but not provide
983 gain. For most users, this will be desired
984 as it will prevent clipping. By appending
985 the 24dB_digital_gain parameter, the Digital
986 volume control will allow up to 24dB of
987 gain. If this parameter is enabled, it is the
988 responsibility of the user to ensure that
989 the Digital volume control is set to a value
990 that does not result in clipping/distortion!)
994 Info: Disable onboard Bluetooth on Bluetooth-capable Raspberry Pis. On Pis
995 prior to Pi 5 this restores UART0/ttyAMA0 over GPIOs 14 & 15.
996 Load: dtoverlay=disable-bt
1000 Name: disable-bt-pi5
1001 Info: See disable-bt
1005 Info: Disable EMMC2 controller on BCM2711.
1006 The allows the onboard EMMC storage on Compute Module 4 to be disabled
1007 e.g. if a fault has occurred.
1008 Load: dtoverlay=disable-emmc2
1013 Info: Disable onboard WLAN on WiFi-capable Raspberry Pis.
1014 Load: dtoverlay=disable-wifi
1018 Name: disable-wifi-pi5
1019 Info: See disable-wifi
1023 Info: Overlay for a generic 18-bit DPI display
1024 This uses GPIOs 0-21 (so no I2C, uart etc.), and activates the output
1025 2-3 seconds after the kernel has started.
1026 Load: dtoverlay=dpi18
1031 Info: Overlay for a generic 18-bit DPI display (in 'mode 6' connection scheme)
1032 This uses GPIOs 0-9,12-17,20-25 (so no I2C, uart etc.), and activates
1033 the output 3-3 seconds after the kernel has started.
1034 Load: dtoverlay=dpi18cpadhi
1039 Info: Overlay for a generic 24-bit DPI display
1040 This uses GPIOs 0-27 (so no I2C, uart etc.), and activates the output
1041 2-3 seconds after the kernel has started.
1042 Load: dtoverlay=dpi24
1047 Info: Configures the NW Digital Radio DRAWS Hat
1049 The board includes an ADC to measure various board values and also
1050 provides two analog user inputs on the expansion header. The ADC
1051 can be configured for various sample rates and gain values to adjust
1052 the input range. Tables describing the two parameters follow.
1064 ADC Datarate Values:
1069 4 = 1600sps (default)
1073 Load: dtoverlay=draws,<param>=<val>
1074 Params: draws_adc_ch4_gain Sets the full scale resolution of the ADCs
1075 input voltage sensor (default 1)
1077 draws_adc_ch4_datarate Sets the datarate of the ADCs input voltage
1080 draws_adc_ch5_gain Sets the full scale resolution of the ADCs
1081 5V rail voltage sensor (default 1)
1083 draws_adc_ch5_datarate Sets the datarate of the ADCs 4V rail voltage
1086 draws_adc_ch6_gain Sets the full scale resolution of the ADCs
1087 AIN2 input (default 2)
1089 draws_adc_ch6_datarate Sets the datarate of the ADCs AIN2 input
1091 draws_adc_ch7_gain Sets the full scale resolution of the ADCs
1092 AIN3 input (default 2)
1094 draws_adc_ch7_datarate Sets the datarate of the ADCs AIN3 input
1096 alsaname Name of the ALSA audio device (default "draws")
1100 Info: Selects the dwc_otg USB controller driver which has fiq support. This
1101 is the default on all except the Pi Zero which defaults to dwc2.
1102 Load: dtoverlay=dwc-otg
1107 Info: Selects the dwc2 USB controller driver
1108 Load: dtoverlay=dwc2,<param>=<val>
1109 Params: dr_mode Dual role mode: "host", "peripheral" or "otg"
1111 g-rx-fifo-size Size of rx fifo size in gadget mode
1113 g-np-tx-fifo-size Size of non-periodic tx fifo size in gadget
1118 Info: See dwc2 (this is the Pi 5 version)
1121 [ The ds1307-rtc overlay has been deleted. See i2c-rtc. ]
1125 Info: Overlay for the EDT FT5406 touchscreen.
1126 This works with the Raspberry Pi 7" touchscreen when not being polled
1128 By default the overlay uses the i2c_csi_dsi I2C interface, but this
1130 You MUST use either "disable_touchscreen=1" or "ignore_lcd=1" in
1131 config.txt to stop the firmware polling the touchscreen.
1132 Load: dtoverlay=edt-ft5406,<param>=<val>
1133 Params: sizex Touchscreen size x (default 800)
1134 sizey Touchscreen size y (default 480)
1135 invx Touchscreen inverted x axis
1136 invy Touchscreen inverted y axis
1137 swapxy Touchscreen swapped x y axis
1138 i2c0 Choose the I2C0 bus on GPIOs 0&1
1139 i2c1 Choose the I2C1 bus on GPIOs 2&3
1140 i2c3 Choose the I2C3 bus (configure with the i2c3
1141 overlay - BCM2711 only)
1142 i2c4 Choose the I2C4 bus (configure with the i2c4
1143 overlay - BCM2711 only)
1144 i2c5 Choose the I2C5 bus (configure with the i2c5
1145 overlay - BCM2711 only)
1146 i2c6 Choose the I2C6 bus (configure with the i2c6
1147 overlay - BCM2711 only)
1148 addr Sets the address for the touch controller. Note
1149 that the device must be configured to use the
1154 Info: Overlay for the Microchip ENC28J60 Ethernet Controller on SPI0
1155 Load: dtoverlay=enc28j60,<param>=<val>
1156 Params: int_pin GPIO used for INT (default 25)
1158 speed SPI bus speed (default 12000000)
1162 Info: Overlay for the Microchip ENC28J60 Ethernet Controller on SPI2
1163 Load: dtoverlay=enc28j60-spi2,<param>=<val>
1164 Params: int_pin GPIO used for INT (default 39)
1166 speed SPI bus speed (default 12000000)
1170 Info: Enables I2C connected EETI EXC3000 multiple touch controller using
1171 GPIO 4 (pin 7 on GPIO header) for interrupt.
1172 Load: dtoverlay=exc3000,<param>=<val>
1173 Params: interrupt GPIO used for interrupt (default 4)
1174 sizex Touchscreen size x (default 4096)
1175 sizey Touchscreen size y (default 4096)
1176 invx Touchscreen inverted x axis
1177 invy Touchscreen inverted y axis
1178 swapxy Touchscreen swapped x y axis
1182 Info: Overlay for SPI-connected displays using the fbtft drivers.
1184 This overlay seeks to replace the functionality provided by fbtft_device
1185 which is now gone from the kernel.
1187 Most displays from fbtft_device have been ported over.
1189 dtoverlay=fbtft,spi0-0,rpi-display,reset_pin=23,dc_pin=24,led_pin=18,rotate=270
1191 It is also possible to specify the controller (this will use the default
1192 init sequence in the driver).
1194 dtoverlay=fbtft,spi0-0,ili9341,bgr,reset_pin=23,dc_pin=24,led_pin=18,rotate=270
1196 For devices on spi1 or spi2, the interfaces should be enabled
1197 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
1199 The following features of fbtft_device have not been ported over:
1200 - parallel bus is not supported
1201 - the init property which overrides the controller initialization
1202 sequence is not supported as a parameter due to memory limitations in
1203 the bootloader responsible for applying the overlay.
1205 See https://github.com/notro/fbtft/wiki/FBTFT-RPI-overlays for how to
1208 Load: dtoverlay=fbtft,<param>=<val>
1210 spi<n>-<m> Configure device at spi<n>, cs<m>
1212 speed SPI bus speed in Hz (default 32000000)
1213 cpha Shifted clock phase (CPHA) mode
1214 cpol Inverse clock polarity (CPOL) mode
1216 adafruit18 Adafruit 1.8
1217 adafruit22 Adafruit 2.2 (old)
1218 adafruit22a Adafruit 2.2
1219 adafruit28 Adafruit 2.8
1220 adafruit13m Adafruit 1.3 OLED
1221 admatec_c-berry28 C-Berry28
1223 er_tftm050_2 ER-TFTM070-2
1224 er_tftm070_5 ER-TFTM070-5
1226 ew24ha0_9bit EW24HA0 in 9-bit mode
1227 freetronicsoled128 Freetronics OLED128
1230 itdb28_spi ITDB02-2.8 with SPI interface circuit
1231 mi0283qt-2 Watterott MI0283QT-2
1232 mi0283qt-9a Watterott MI0283QT-9A
1233 nokia3310 Nokia 3310
1234 nokia3310a Nokia 3310a
1235 nokia5110 Nokia 5110
1237 pitft Adafruit PiTFT 2.8
1239 rpi-display Watterott rpi-display
1240 sainsmart18 Sainsmart 1.8
1241 sainsmart32_spi Sainsmart 3.2 with SPI interfce circuit
1242 tinylcd35 TinyLCD 3.5
1243 tm022hdh26 Tianma TM022HDH26
1244 tontec35_9481 Tontect 3.5 with ILI9481 controller
1245 tontec35_9486 Tontect 3.5 with ILI9486 controller
1246 waveshare32b Waveshare 3.2
1247 waveshare22 Waveshare 2.2
1249 bd663474 BD663474 display controller
1250 hx8340bn HX8340BN display controller
1251 hx8347d HX8347D display controller
1252 hx8353d HX8353D display controller
1253 hx8357d HX8357D display controller
1254 ili9163 ILI9163 display controller
1255 ili9320 ILI9320 display controller
1256 ili9325 ILI9325 display controller
1257 ili9340 ILI9340 display controller
1258 ili9341 ILI9341 display controller
1259 ili9481 ILI9481 display controller
1260 ili9486 ILI9486 display controller
1261 pcd8544 PCD8544 display controller
1262 ra8875 RA8875 display controller
1263 s6d02a1 S6D02A1 display controller
1264 s6d1121 S6D1121 display controller
1265 seps525 SEPS525 display controller
1266 sh1106 SH1106 display controller
1267 ssd1289 SSD1289 display controller
1268 ssd1305 SSD1305 display controller
1269 ssd1306 SSD1306 display controller
1270 ssd1325 SSD1325 display controller
1271 ssd1331 SSD1331 display controller
1272 ssd1351 SSD1351 display controller
1273 st7735r ST7735R display controller
1274 st7789v ST7789V display controller
1275 tls8204 TLS8204 display controller
1276 uc1611 UC1611 display controller
1277 uc1701 UC1701 display controller
1278 upd161704 UPD161704 display controller
1280 width Display width in pixels
1281 height Display height in pixels
1282 regwidth Display controller register width (default is
1284 buswidth Display bus interface width (default 8)
1285 debug Debug output level {0-7}
1286 rotate Display rotation {0, 90, 180, 270} (counter
1287 clockwise). Not supported by all drivers.
1288 bgr Enable BGR mode (default off). Use if Red and
1289 Blue are swapped. Not supported by all drivers.
1290 fps Frames per second (default 30). In effect this
1291 states how long the driver will wait after video
1292 memory has been changed until display update
1293 transfer is started.
1294 txbuflen Length of the FBTFT transmit buffer
1296 startbyte Sets the Start byte used by fb_ili9320,
1297 fb_ili9325 and fb_hx8347d. Common value is 0x70.
1298 gamma String representation of Gamma Curve(s). Driver
1299 specific. Not supported by all drivers.
1300 reset_pin GPIO pin for RESET
1301 dc_pin GPIO pin for D/C
1302 led_pin GPIO pin for LED backlight
1306 Info: Configures the Fe-Pi Audio Sound Card
1307 Load: dtoverlay=fe-pi-audio
1312 Info: A demonstration of the gpio-fsm driver. The GPIOs are chosen to work
1313 nicely with a "traffic-light" display of red, amber and green LEDs on
1314 GPIOs 7, 8 and 25 respectively.
1315 Load: dtoverlay=fsm-demo,<param>=<val>
1316 Params: fsm_debug Enable debug logging (default off)
1320 Info: Enables GalaxyCore's GC9A01 single chip driver based displays on
1321 SPI0 as fb1, using GPIOs DC=25, RST=27 and BL=18 (physical
1322 GPIO header pins 22, 13 and 12 respectively) in addition to the
1323 SPI0 pins DIN=10, CLK=11 and CS=8 (physical GPIO header pins 19,
1324 23 and 24 respectively).
1325 Load: dtoverlay=gc9a01,<param>=<val>
1326 Params: speed Display SPI bus speed
1328 rotate Display rotation {0,90,180,270}
1330 width Width of the display
1332 height Height of the display
1334 fps Delay between frame updates
1336 debug Debug output level {0-7}
1340 Info: An overlay for the Ghost amplifier.
1341 Load: dtoverlay=ghost-amp,<param>=<val>
1342 Params: fsm_debug Enable debug logging of the GPIO FSM (default
1347 Info: Enables I2C connected Goodix gt9271 multiple touch controller using
1348 GPIOs 4 and 17 (pins 7 and 11 on GPIO header) for interrupt and reset.
1349 Load: dtoverlay=goodix,<param>=<val>
1350 Params: interrupt GPIO used for interrupt (default 4)
1351 reset GPIO used for reset (default 17)
1354 Name: googlevoicehat-soundcard
1355 Info: Configures the Google voiceHAT soundcard
1356 Load: dtoverlay=googlevoicehat-soundcard
1361 Info: This is a generic overlay for detecting charger with GPIO.
1362 Load: dtoverlay=gpio-charger,<param>=<val>
1363 Params: gpio GPIO pin to trigger on (default 4)
1364 active_low When this is 1 (active low), a falling
1365 edge generates a charging event and a
1366 rising edge generates a discharging event.
1367 When this is 0 (active high), this is
1368 reversed. The default is 0 (active high)
1369 gpio_pull Desired pull-up/down state (off, down, up)
1371 type Set a charger type for the pin. (Default: mains)
1375 Info: Configure a GPIO pin to control a cooling fan.
1376 Load: dtoverlay=gpio-fan,<param>=<val>
1377 Params: gpiopin GPIO used to control the fan (default 12)
1378 temp Temperature at which the fan switches on, in
1379 millicelcius (default 55000)
1380 hyst Temperature delta (in millicelcius) below
1381 temp at which the fan will drop to minrpm
1386 Info: Activate a "hog" for a GPIO - request that the kernel configures it as
1387 an output, driven low or high as indicated by the presence or absence
1388 of the active_low parameter. Note that a hogged GPIO is not available
1389 to other drivers or for gpioset/gpioget.
1390 Load: dtoverlay=gpio-hog,<param>=<val>
1391 Params: gpio GPIO pin to hog (default 26)
1392 active_low If set, the hog drives the GPIO low (defaults
1393 to off - the GPIO is driven high)
1397 Info: Use GPIO pin as rc-core style infrared receiver input. The rc-core-
1398 based gpio_ir_recv driver maps received keys directly to a
1399 /dev/input/event* device, all decoding is done by the kernel - LIRC is
1400 not required! The key mapping and other decoding parameters can be
1401 configured by "ir-keytable" tool.
1402 Load: dtoverlay=gpio-ir,<param>=<val>
1403 Params: gpio_pin Input pin number. Default is 18.
1405 gpio_pull Desired pull-up/down state (off, down, up)
1408 invert "1" = invert the input (active-low signalling).
1409 "0" = non-inverted input (active-high
1410 signalling). Default is "1".
1412 rc-map-name Default rc keymap (can also be changed by
1413 ir-keytable), defaults to "rc-rc6-mce"
1417 Info: Use GPIO pin as bit-banged infrared transmitter output.
1418 This is an alternative to "pwm-ir-tx". gpio-ir-tx doesn't require
1419 a PWM so it can be used together with onboard analog audio.
1420 Load: dtoverlay=gpio-ir-tx,<param>=<val>
1421 Params: gpio_pin Output GPIO (default 18)
1423 invert "1" = invert the output (make it active-low).
1424 Default is "0" (active-high).
1428 Info: This is a generic overlay for activating GPIO keypresses using
1429 the gpio-keys library and this dtoverlay. Multiple keys can be
1430 set up using multiple calls to the overlay for configuring
1431 additional buttons or joysticks. You can see available keycodes
1432 at https://github.com/torvalds/linux/blob/v4.12/include/uapi/
1433 linux/input-event-codes.h#L64
1434 Load: dtoverlay=gpio-key,<param>=<val>
1435 Params: gpio GPIO pin to trigger on (default 3)
1436 active_low When this is 1 (active low), a falling
1437 edge generates a key down event and a
1438 rising edge generates a key up event.
1439 When this is 0 (active high), this is
1440 reversed. The default is 1 (active low)
1441 gpio_pull Desired pull-up/down state (off, down, up)
1442 Default is "up". Note that the default pin
1443 (GPIO3) has an external pullup
1444 label Set a label for the key
1445 keycode Set the key code for the button
1450 Info: This is a generic overlay for activating LEDs (or any other component)
1451 by a GPIO pin. Multiple LEDs can be set up using multiple calls to the
1452 overlay. While there are many existing methods to activate LEDs on the
1453 RPi, this method offers some advantages:
1454 1) Does not require any userspace programs.
1455 2) LEDs can be connected to the kernel's led-trigger framework,
1456 and drive the LED based on triggers such as cpu load, heartbeat,
1457 kernel panic, key input, timers and others.
1458 3) LED can be tied to the input state of another GPIO pin.
1459 4) The LED is setup early during the kernel boot process (useful
1460 for cpu/heartbeat/panic triggers).
1462 Typical electrical connection is:
1463 RPI-GPIO.19 -> LED -> 300ohm resister -> RPI-GND
1464 The GPIO pin number can be changed with the 'gpio=' parameter.
1466 To control an LED from userspace, write a 0 or 1 value:
1467 echo 1 > /sys/class/leds/myled1/brightness
1468 The 'myled1' name can be changed with the 'label=' parameter.
1470 To connect the LED to a kernel trigger from userspace:
1471 echo cpu > /sys/class/leds/myled1/trigger
1472 echo heartbeat > /sys/class/leds/myled1/trigger
1473 echo none > /sys/class/leds/myled1/trigger
1474 To connect the LED to GPIO.26 pin (physical pin 37):
1475 echo gpio > /sys/class/leds/myled1/trigger
1476 echo 26 > /sys/class/leds/myled1/gpio
1478 cat /sys/class/leds/myled1/trigger
1480 More information about the Linux kernel LED/Trigger system:
1481 https://www.kernel.org/doc/Documentation/leds/leds-class.rst
1482 https://www.kernel.org/doc/Documentation/leds/ledtrig-oneshot.rst
1483 Load: dtoverlay=gpio-led,<param>=<val>
1484 Params: gpio GPIO pin connected to the LED (default 19)
1485 label The label for this LED. It will appear under
1486 /sys/class/leds/<label> . Default 'myled1'.
1487 trigger Set the led-trigger to connect to this LED.
1488 default 'none' (LED is user-controlled).
1489 Some possible triggers:
1490 cpu - CPU load (all CPUs)
1491 cpu0 - CPU load of first CPU.
1492 mmc - disk activity (all disks)
1493 panic - turn on on kernel panic
1494 heartbeat - indicate system health
1495 gpio - connect to a GPIO input pin (note:
1496 currently the GPIO PIN can not be set
1497 using overlay parameters, must be
1498 done in userspace, see examples above.
1499 active_low Set to 1 to turn invert the LED control
1500 (writing 0 to /sys/class/leds/XXX/brightness
1501 will turn on the GPIO/LED). Default '0'.
1504 Name: gpio-no-bank0-irq
1505 Info: Use this overlay to disable GPIO interrupts for GPIOs in bank 0 (0-27),
1506 which can be useful for UIO drivers.
1507 N.B. Using this overlay will trigger a kernel WARN during booting, but
1508 this can safely be ignored - the system should work as expected.
1509 Load: dtoverlay=gpio-no-bank0-irq
1514 Info: Use this overlay to disable all GPIO interrupts, which can be useful
1515 for user-space GPIO edge detection systems.
1516 Load: dtoverlay=gpio-no-irq
1521 Info: Drives a GPIO high or low on poweroff (including halt). Using this
1522 overlay interferes with the normal power-down sequence, preventing the
1523 kernel from resetting the SoC (a necessary step in a normal power-off
1524 or reboot). This also disables the ability to trigger a boot by driving
1527 The GPIO starts in an inactive state. At poweroff time it is driven
1528 active for 100ms, then inactive for 100ms, then active again. It is
1529 safe to remove the power at any point after the initial activation of
1532 Users of this overlay are required to provide an external mechanism to
1533 switch off the power supply when signalled - failure to do so results
1534 in a kernel BUG, increased power consumption and undefined behaviour.
1535 Load: dtoverlay=gpio-poweroff,<param>=<val>
1536 Params: gpiopin GPIO for signalling (default 26)
1538 active_low Set if the power control device requires a
1539 high->low transition to trigger a power-down.
1540 Note that this will require the support of a
1541 custom dt-blob.bin to prevent a power-down
1542 during the boot process, and that a reboot
1543 will also cause the pin to go low.
1544 input Set if the gpio pin should be configured as
1546 export Set to export the configured pin to sysfs
1547 active_delay_ms Initial GPIO active period (default 100)
1548 inactive_delay_ms Subsequent GPIO inactive period (default 100)
1549 timeout_ms Specify (in ms) how long the kernel waits for
1550 power-down before issuing a WARN (default 3000).
1554 Info: Initiates a shutdown when GPIO pin changes. The given GPIO pin
1555 is configured as an input key that generates KEY_POWER events.
1557 This event is handled by systemd-logind by initiating a
1558 shutdown. Systemd versions older than 225 need an udev rule
1559 enable listening to the input device:
1561 ACTION!="REMOVE", SUBSYSTEM=="input", KERNEL=="event*", \
1562 SUBSYSTEMS=="platform", DRIVERS=="gpio-keys", \
1563 ATTRS{keys}=="116", TAG+="power-switch"
1565 Alternatively this event can be handled also on systems without
1566 systemd, just by traditional SysV init daemon. KEY_POWER event
1567 (keycode 116) needs to be mapped to KeyboardSignal on console
1568 and then kb::kbrequest inittab action which is triggered by
1569 KeyboardSignal from console can be configured to issue system
1570 shutdown. Steps for this configuration are:
1572 Add following lines to the /etc/console-setup/remap.inc file:
1574 # Key Power as special keypress
1575 keycode 116 = KeyboardSignal
1577 Then add following lines to /etc/inittab file:
1579 # Action on special keypress (Key Power)
1580 kb::kbrequest:/sbin/shutdown -t1 -a -h -P now
1582 And finally reload configuration by calling following commands:
1584 # dpkg-reconfigure console-setup
1585 # service console-setup reload
1588 This overlay only handles shutdown. After shutdown, the system
1589 can be powered up again by driving GPIO3 low. The default
1590 configuration uses GPIO3 with a pullup, so if you connect a
1591 button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
1592 you get a shutdown and power-up button. Please note that
1593 Raspberry Pi 1 Model B rev 1 uses GPIO1 instead of GPIO3.
1594 Load: dtoverlay=gpio-shutdown,<param>=<val>
1595 Params: gpio_pin GPIO pin to trigger on (default 3)
1596 For Raspberry Pi 1 Model B rev 1 set this
1597 explicitly to value 1, e.g.:
1599 dtoverlay=gpio-shutdown,gpio_pin=1
1601 active_low When this is 1 (active low), a falling
1602 edge generates a key down event and a
1603 rising edge generates a key up event.
1604 When this is 0 (active high), this is
1605 reversed. The default is 1 (active low).
1607 gpio_pull Desired pull-up/down state (off, down, up)
1610 Note that the default pin (GPIO3) has an
1611 external pullup. Same applies for GPIO1
1612 on Raspberry Pi 1 Model B rev 1.
1614 debounce Specify the debounce interval in milliseconds
1619 Info: Configures an HD44780 compatible LCD display. Uses 4 gpio pins for
1620 data, 2 gpio pins for enable and register select and 1 optional pin
1621 for enabling/disabling the backlight display.
1622 Load: dtoverlay=hd44780-lcd,<param>=<val>
1623 Params: pin_d4 GPIO pin for data pin D4 (default 6)
1625 pin_d5 GPIO pin for data pin D5 (default 13)
1627 pin_d6 GPIO pin for data pin D6 (default 19)
1629 pin_d7 GPIO pin for data pin D7 (default 26)
1631 pin_en GPIO pin for "Enable" (default 21)
1633 pin_rs GPIO pin for "Register Select" (default 20)
1635 pin_bl Optional pin for enabling/disabling the
1636 display backlight. (default disabled)
1638 display_height Height of the display in characters
1640 display_width Width of the display in characters
1643 Name: hdmi-backlight-hwhack-gpio
1644 Info: Devicetree overlay for GPIO based backlight on/off capability.
1645 Use this if you have one of those HDMI displays whose backlight cannot
1646 be controlled via DPMS over HDMI and plan to do a little soldering to
1647 use an RPi gpio pin for on/off switching. See:
1648 https://www.waveshare.com/wiki/7inch_HDMI_LCD_(C)#Backlight_Control
1649 Load: dtoverlay=hdmi-backlight-hwhack-gpio,<param>=<val>
1650 Params: gpio_pin GPIO pin used (default 17)
1651 active_low Set this to 1 if the display backlight is
1652 switched on when the wire goes low.
1653 Leave the default (value 0) if the backlight
1654 expects a high to switch it on.
1658 Info: Configures the HifiBerry Amp and Amp+ audio cards
1659 Load: dtoverlay=hifiberry-amp
1663 Name: hifiberry-amp100
1664 Info: Configures the HifiBerry AMP100 audio card
1665 Load: dtoverlay=hifiberry-amp100,<param>=<val>
1666 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
1667 Digital volume control. Enable with
1668 "dtoverlay=hifiberry-amp100,24db_digital_gain"
1669 (The default behaviour is that the Digital
1670 volume control is limited to a maximum of
1671 0dB. ie. it can attenuate but not provide
1672 gain. For most users, this will be desired
1673 as it will prevent clipping. By appending
1674 the 24dB_digital_gain parameter, the Digital
1675 volume control will allow up to 24dB of
1676 gain. If this parameter is enabled, it is the
1677 responsibility of the user to ensure that
1678 the Digital volume control is set to a value
1679 that does not result in clipping/distortion!)
1680 slave Force AMP100 into slave mode, using Pi as
1681 master for bit clock and frame clock.
1682 leds_off If set to 'true' the onboard indicator LEDs
1683 are switched off at all times.
1684 auto_mute If set to 'true' the amplifier is automatically
1685 muted when the DAC is not playing.
1686 mute_ext_ctl The amplifier's HW mute control is enabled
1687 in ALSA mixer and set to <val>.
1688 Will be overwritten by ALSA user settings.
1691 Name: hifiberry-amp3
1692 Info: Configures the HifiBerry Amp3 audio card
1693 Load: dtoverlay=hifiberry-amp3
1698 Info: Configures the HifiBerry DAC audio cards
1699 Load: dtoverlay=hifiberry-dac
1703 Name: hifiberry-dacplus
1704 Info: Configures the HifiBerry DAC+ audio card
1705 Load: dtoverlay=hifiberry-dacplus,<param>=<val>
1706 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
1707 Digital volume control. Enable with
1708 "dtoverlay=hifiberry-dacplus,24db_digital_gain"
1709 (The default behaviour is that the Digital
1710 volume control is limited to a maximum of
1711 0dB. ie. it can attenuate but not provide
1712 gain. For most users, this will be desired
1713 as it will prevent clipping. By appending
1714 the 24dB_digital_gain parameter, the Digital
1715 volume control will allow up to 24dB of
1716 gain. If this parameter is enabled, it is the
1717 responsibility of the user to ensure that
1718 the Digital volume control is set to a value
1719 that does not result in clipping/distortion!)
1720 slave Force DAC+ into slave mode, using Pi as
1721 master for bit clock and frame clock.
1722 leds_off If set to 'true' the onboard indicator LEDs
1723 are switched off at all times.
1726 Name: hifiberry-dacplusadc
1727 Info: Configures the HifiBerry DAC+ADC audio card
1728 Load: dtoverlay=hifiberry-dacplusadc,<param>=<val>
1729 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
1730 Digital volume control. Enable with
1731 "dtoverlay=hifiberry-dacplus,24db_digital_gain"
1732 (The default behaviour is that the Digital
1733 volume control is limited to a maximum of
1734 0dB. ie. it can attenuate but not provide
1735 gain. For most users, this will be desired
1736 as it will prevent clipping. By appending
1737 the 24dB_digital_gain parameter, the Digital
1738 volume control will allow up to 24dB of
1739 gain. If this parameter is enabled, it is the
1740 responsibility of the user to ensure that
1741 the Digital volume control is set to a value
1742 that does not result in clipping/distortion!)
1743 slave Force DAC+ADC into slave mode, using Pi as
1744 master for bit clock and frame clock.
1745 leds_off If set to 'true' the onboard indicator LEDs
1746 are switched off at all times.
1749 Name: hifiberry-dacplusadcpro
1750 Info: Configures the HifiBerry DAC+ADC PRO audio card
1751 Load: dtoverlay=hifiberry-dacplusadcpro,<param>=<val>
1752 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
1753 Digital volume control. Enable with
1754 "dtoverlay=hifiberry-dacplusadcpro,24db_digital_gain"
1755 (The default behaviour is that the Digital
1756 volume control is limited to a maximum of
1757 0dB. ie. it can attenuate but not provide
1758 gain. For most users, this will be desired
1759 as it will prevent clipping. By appending
1760 the 24dB_digital_gain parameter, the Digital
1761 volume control will allow up to 24dB of
1762 gain. If this parameter is enabled, it is the
1763 responsibility of the user to ensure that
1764 the Digital volume control is set to a value
1765 that does not result in clipping/distortion!)
1766 slave Force DAC+ADC Pro into slave mode, using Pi as
1767 master for bit clock and frame clock.
1768 leds_off If set to 'true' the onboard indicator LEDs
1769 are switched off at all times.
1772 Name: hifiberry-dacplusdsp
1773 Info: Configures the HifiBerry DAC+DSP audio card
1774 Load: dtoverlay=hifiberry-dacplusdsp
1778 Name: hifiberry-dacplushd
1779 Info: Configures the HifiBerry DAC+ HD audio card
1780 Load: dtoverlay=hifiberry-dacplushd
1784 Name: hifiberry-digi
1785 Info: Configures the HifiBerry Digi and Digi+ audio card
1786 Load: dtoverlay=hifiberry-digi
1790 Name: hifiberry-digi-pro
1791 Info: Configures the HifiBerry Digi+ Pro and Digi2 Pro audio card
1792 Load: dtoverlay=hifiberry-digi-pro
1797 Info: Enables "High Peripheral" mode
1798 Load: dtoverlay=highperi
1803 Info: HY28A - 2.8" TFT LCD Display Module by HAOYU Electronics
1804 Default values match Texy's display shield
1805 Load: dtoverlay=hy28a,<param>=<val>
1806 Params: speed Display SPI bus speed
1808 rotate Display rotation {0,90,180,270}
1810 fps Delay between frame updates
1812 debug Debug output level {0-7}
1814 xohms Touchpanel sensitivity (X-plate resistance)
1816 resetgpio GPIO used to reset controller
1818 ledgpio GPIO used to control backlight
1822 Info: HY28B - 2.8" TFT LCD Display Module by HAOYU Electronics
1823 Default values match Texy's display shield
1824 Load: dtoverlay=hy28b,<param>=<val>
1825 Params: speed Display SPI bus speed
1827 rotate Display rotation {0,90,180,270}
1829 fps Delay between frame updates
1831 debug Debug output level {0-7}
1833 xohms Touchpanel sensitivity (X-plate resistance)
1835 resetgpio GPIO used to reset controller
1837 ledgpio GPIO used to control backlight
1841 Info: HY28B 2017 version - 2.8" TFT LCD Display Module by HAOYU Electronics
1842 Default values match Texy's display shield
1843 Load: dtoverlay=hy28b-2017,<param>=<val>
1844 Params: speed Display SPI bus speed
1846 rotate Display rotation {0,90,180,270}
1848 fps Delay between frame updates
1850 debug Debug output level {0-7}
1852 xohms Touchpanel sensitivity (X-plate resistance)
1854 resetgpio GPIO used to reset controller
1856 ledgpio GPIO used to control backlight
1860 Info: Configures the Audiophonics I-SABRE Q2M DAC
1861 Load: dtoverlay=i-sabre-q2m
1866 Info: Fall back to the i2c_bcm2708 driver for the i2c_arm bus.
1867 Load: dtoverlay=i2c-bcm2708
1872 Info: Adds support for a number of I2C fan controllers
1873 Load: dtoverlay=i2c-fan,<param>=<val>
1874 Params: addr Sets the address for the fan controller. Note
1875 that the device must be configured to use the
1878 i2c0 Choose the I2C0 bus on GPIOs 0&1
1880 i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
1882 i2c3 Choose the I2C3 bus (configure with the i2c3
1883 overlay - BCM2711 only)
1885 i2c4 Choose the I2C4 bus (configure with the i2c4
1886 overlay - BCM2711 only)
1888 i2c5 Choose the I2C5 bus (configure with the i2c5
1889 overlay - BCM2711 only)
1891 i2c6 Choose the I2C6 bus (configure with the i2c6
1892 overlay - BCM2711 only)
1894 minpwm PWM setting for the fan when the SoC is below
1895 mintemp (range 0-255. default 0)
1896 maxpwm PWM setting for the fan when the SoC is above
1897 maxtemp (range 0-255. default 255)
1898 midtemp Temperature (in millicelcius) at which the fan
1899 begins to speed up (default 50000)
1901 midtemp_hyst Temperature delta (in millicelcius) below
1902 mintemp at which the fan will drop to minrpm
1905 maxtemp Temperature (in millicelcius) at which the fan
1906 will be held at maxrpm (default 70000)
1908 maxtemp_hyst Temperature delta (in millicelcius) below
1909 maxtemp at which the fan begins to slow down
1912 emc2301 Select the Microchip EMC230x controller family
1913 - EMC2301, EMC2302, EMC2303, EMC2305.
1917 Info: Adds support for software i2c controller on gpio pins
1918 Load: dtoverlay=i2c-gpio,<param>=<val>
1919 Params: i2c_gpio_sda GPIO used for I2C data (default "23")
1921 i2c_gpio_scl GPIO used for I2C clock (default "24")
1923 i2c_gpio_delay_us Clock delay in microseconds
1924 (default "2" = ~100kHz)
1926 bus Set to a unique, non-zero value if wanting
1927 multiple i2c-gpio busses. If set, will be used
1928 as the preferred bus number (/dev/i2c-<n>). If
1929 not set, the default value is 0, but the bus
1930 number will be dynamically assigned - probably
1935 Info: Adds support for a number of I2C bus multiplexers on i2c_arm
1936 Load: dtoverlay=i2c-mux,<param>=<val>
1937 Params: pca9542 Select the NXP PCA9542 device
1939 pca9545 Select the NXP PCA9545 device
1941 pca9548 Select the NXP PCA9548 device
1943 addr Change I2C address of the device (default 0x70)
1945 i2c0 Choose the I2C0 bus on GPIOs 0&1
1947 i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
1949 i2c3 Choose the I2C3 bus (configure with the i2c3
1950 overlay - BCM2711 only)
1952 i2c4 Choose the I2C3 bus (configure with the i2c3
1953 overlay - BCM2711 only)
1955 i2c5 Choose the I2C5 bus (configure with the i2c4
1956 overlay - BCM2711 only)
1958 i2c6 Choose the I2C6 bus (configure with the i2c6
1959 overlay - BCM2711 only)
1962 [ The i2c-mux-pca9548a overlay has been deleted. See i2c-mux. ]
1965 Name: i2c-pwm-pca9685a
1966 Info: Adds support for an NXP PCA9685A I2C PWM controller on i2c_arm
1967 Load: dtoverlay=i2c-pwm-pca9685a,<param>=<val>
1968 Params: addr I2C address of PCA9685A (default 0x40)
1969 i2c0 Choose the I2C0 bus on GPIOs 0&1
1970 i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
1971 i2c3 Choose the I2C3 bus (configure with the i2c3
1972 overlay - BCM2711 only)
1973 i2c4 Choose the I2C3 bus (configure with the i2c3
1974 overlay - BCM2711 only)
1975 i2c5 Choose the I2C5 bus (configure with the i2c4
1976 overlay - BCM2711 only)
1977 i2c6 Choose the I2C6 bus (configure with the i2c6
1978 overlay - BCM2711 only)
1982 Info: Adds support for a number of I2C Real Time Clock devices
1983 Load: dtoverlay=i2c-rtc,<param>=<val>
1984 Params: abx80x Select one of the ABx80x family:
1985 AB0801, AB0803, AB0804, AB0805,
1986 AB1801, AB1803, AB1804, AB1805
1988 bq32000 Select the TI BQ32000 device
1990 ds1307 Select the DS1307 device
1992 ds1339 Select the DS1339 device
1994 ds1340 Select the DS1340 device
1996 ds3231 Select the DS3231 device
1998 m41t62 Select the M41T62 device
2000 mcp7940x Select the MCP7940x device
2002 mcp7941x Select the MCP7941x device
2004 pcf2127 Select the PCF2127 device
2006 pcf2129 Select the PCF2129 device
2008 pcf85063 Select the PCF85063 device
2010 pcf85063a Select the PCF85063A device
2012 pcf8523 Select the PCF8523 device
2014 pcf85363 Select the PCF85363 device
2016 pcf8563 Select the PCF8563 device
2018 rv1805 Select the Micro Crystal RV1805 device
2020 rv3028 Select the Micro Crystal RV3028 device
2022 rv3032 Select the Micro Crystal RV3032 device
2024 rv8803 Select the Micro Crystal RV8803 device
2026 sd3078 Select the ZXW Shenzhen whwave SD3078 device
2028 s35390a Select the ABLIC S35390A device
2030 i2c0 Choose the I2C0 bus on GPIOs 0&1
2032 i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
2034 i2c3 Choose the I2C3 bus (configure with the i2c3
2035 overlay - BCM2711 only)
2037 i2c4 Choose the I2C3 bus (configure with the i2c3
2038 overlay - BCM2711 only)
2040 i2c5 Choose the I2C5 bus (configure with the i2c4
2041 overlay - BCM2711 only)
2043 i2c6 Choose the I2C6 bus (configure with the i2c6
2044 overlay - BCM2711 only)
2046 addr Sets the address for the RTC. Note that the
2047 device must be configured to use the specified
2050 trickle-diode-disable Do not use the internal trickle charger diode
2053 trickle-diode-type Diode type for trickle charge - "standard" or
2054 "schottky" (ABx80x and RV1805 only)
2056 trickle-resistor-ohms Resistor value for trickle charge (DS1339,
2057 ABx80x, BQ32000, RV1805, RV3028, RV3032)
2059 trickle-voltage-mv Charge pump voltage for trickle charge (RV3032)
2061 wakeup-source Specify that the RTC can be used as a wakeup
2064 backup-switchover-mode Backup power supply switch mode. Must be 0 for
2065 off or 1 for Vdd < VBackup (RV3028, RV3032)
2069 Info: Adds support for a number of I2C Real Time Clock devices
2070 using the software i2c controller
2071 Load: dtoverlay=i2c-rtc-gpio,<param>=<val>
2072 Params: abx80x Select one of the ABx80x family:
2073 AB0801, AB0803, AB0804, AB0805,
2074 AB1801, AB1803, AB1804, AB1805
2076 bq32000 Select the TI BQ32000 device
2078 ds1307 Select the DS1307 device
2080 ds1339 Select the DS1339 device
2082 ds1340 Select the DS1340 device
2084 ds3231 Select the DS3231 device
2086 m41t62 Select the M41T62 device
2088 mcp7940x Select the MCP7940x device
2090 mcp7941x Select the MCP7941x device
2092 pcf2127 Select the PCF2127 device
2094 pcf2129 Select the PCF2129 device
2096 pcf85063 Select the PCF85063 device
2098 pcf85063a Select the PCF85063A device
2100 pcf8523 Select the PCF8523 device
2102 pcf85363 Select the PCF85363 device
2104 pcf8563 Select the PCF8563 device
2106 rv1805 Select the Micro Crystal RV1805 device
2108 rv3028 Select the Micro Crystal RV3028 device
2110 rv3032 Select the Micro Crystal RV3032 device
2112 rv8803 Select the Micro Crystal RV8803 device
2114 sd3078 Select the ZXW Shenzhen whwave SD3078 device
2116 s35390a Select the ABLIC S35390A device
2118 addr Sets the address for the RTC. Note that the
2119 device must be configured to use the specified
2122 trickle-diode-disable Do not use the internal trickle charger diode
2125 trickle-diode-type Diode type for trickle charge - "standard" or
2126 "schottky" (ABx80x and RV1805 only)
2128 trickle-resistor-ohms Resistor value for trickle charge (DS1339,
2129 ABx80x, BQ32000, RV1805, RV3028, RV3032)
2131 trickle-voltage-mv Charge pump voltage for trickle charge (RV3032)
2133 wakeup-source Specify that the RTC can be used as a wakeup
2136 backup-switchover-mode Backup power supply switch mode. Must be 0 for
2137 off or 1 for Vdd < VBackup (RV3028, RV3032)
2139 i2c_gpio_sda GPIO used for I2C data (default "23")
2141 i2c_gpio_scl GPIO used for I2C clock (default "24")
2143 i2c_gpio_delay_us Clock delay in microseconds
2144 (default "2" = ~100kHz)
2148 Info: Adds support for a number of I2C barometric pressure, temperature,
2149 light level and chemical sensors on i2c_arm
2150 Load: dtoverlay=i2c-sensor,<param>=<val>
2151 Params: addr Set the address for the BH1750, BME280, BME680,
2152 BMP280, BMP380, CCS811, DS1621, HDC100X, JC42,
2153 LM75, MCP980x, MPU6050, MPU9250, MS5637, MS5803,
2154 MS5805, MS5837, MS8607, SHT3x or TMP102
2156 aht10 Select the Aosong AHT10 temperature and humidity
2159 bh1750 Select the Rohm BH1750 ambient light sensor
2160 Valid addresses 0x23 or 0x5c, default 0x23
2162 bme280 Select the Bosch Sensortronic BME280
2163 Valid addresses 0x76-0x77, default 0x76
2165 bme680 Select the Bosch Sensortronic BME680
2166 Valid addresses 0x76-0x77, default 0x76
2168 bmp085 Select the Bosch Sensortronic BMP085
2170 bmp180 Select the Bosch Sensortronic BMP180
2172 bmp280 Select the Bosch Sensortronic BMP280
2173 Valid addresses 0x76-0x77, default 0x76
2175 bmp380 Select the Bosch Sensortronic BMP380
2176 Valid addresses 0x76-0x77, default 0x76
2178 bno055 Select the Bosch Sensortronic BNO055 IMU
2179 Valid address 0x28-0x29, default 0x29
2181 ccs811 Select the AMS CCS811 digital gas sensor
2182 Valid addresses 0x5a-0x5b, default 0x5b
2184 ds1621 Select the Dallas Semiconductors DS1621 temp
2185 sensor. Valid addresses 0x48-0x4f, default 0x48
2187 hdc100x Select the Texas Instruments HDC100x temp sensor
2188 Valid addresses 0x40-0x43, default 0x40
2190 htu21 Select the HTU21 temperature and humidity sensor
2192 int_pin Set the GPIO to use for interrupts (max30102,
2193 mpu6050 and mpu9250 only)
2195 jc42 Select any of the many JEDEC JC42.4-compliant
2196 temperature sensors, including:
2197 ADT7408, AT30TS00, CAT34TS02, CAT6095,
2198 MAX6604, MCP9804, MCP9805, MCP9808,
2199 MCP98242, MCP98243, MCP98244, MCP9843,
2200 SE97, SE98, STTS424(E), STTS2002, STTS3000,
2201 TSE2002, TSE2004, TS3000, and TS3001.
2202 The default address is 0x18.
2204 lm75 Select the Maxim LM75 temperature sensor
2205 Valid addresses 0x48-0x4f, default 0x4f
2207 lm75addr Deprecated - use addr parameter instead
2209 max17040 Select the Maxim Integrated MAX17040 battery
2212 max30102 Select the Maxim Integrated MAX30102 heart-rate
2213 and blood-oxygen sensor
2215 mcp980x Select the Maxim MCP980x range of temperature
2216 sensors (i.e. MCP9800, MCP9801, MCP9802 and
2217 MCP9803). N.B. For MCP9804, MCP9805 and MCP9808,
2218 use the "jc42" option.
2219 Valid addresses are 0x18-0x1f (default 0x18)
2221 mpu6050 Select the InvenSense MPU6050 IMU. Valid
2222 valid addresses are 0x68 and 0x69 (default 0x68)
2224 mpu9250 Select the InvenSense MPU9250 IMU. Valid
2225 valid addresses are 0x68 and 0x69 (default 0x68)
2227 ms5637 Select the Measurement Specialities MS5637
2228 pressure and temperature sensor.
2230 ms5803 Select the Measurement Specialities MS5803
2231 pressure and temperature sensor.
2233 ms5805 Select the Measurement Specialities MS5805
2234 pressure and temperature sensor.
2236 ms5837 Select the Measurement Specialities MS5837
2237 pressure and temperature sensor.
2239 ms8607 Select the Measurement Specialities MS8607
2240 pressure and temperature sensor.
2242 no_timeout Disable the SMBUS timeout. N.B. Only supported
2243 by some jc42 devices - using with an
2244 incompatible device can stop it from being
2247 reset_pin GPIO to be used to reset the device (bno055
2248 only, disabled by default)
2250 sht3x Select the Sensirion SHT3x temperature and
2251 humidity sensors. Valid addresses 0x44-0x45,
2254 sht4x Select the Sensirion SHT4x temperature and
2255 humidity sensors. Valid addresses 0x44-0x45,
2258 si7020 Select the Silicon Labs Si7013/20/21 humidity/
2261 sps30 Select the Sensirion SPS30 particulate matter
2262 sensor. Fixed address 0x69.
2264 sgp30 Select the Sensirion SGP30 VOC sensor.
2267 tmp102 Select the Texas Instruments TMP102 temp sensor
2268 Valid addresses 0x48-0x4b, default 0x48
2270 tsl4531 Select the AMS TSL4531 digital ambient light
2273 veml6070 Select the Vishay VEML6070 ultraviolet light
2276 i2c0 Choose the I2C0 bus on GPIOs 0&1
2278 i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
2280 i2c3 Choose the I2C3 bus (configure with the i2c3
2281 overlay - BCM2711 only)
2283 i2c4 Choose the I2C3 bus (configure with the i2c3
2284 overlay - BCM2711 only)
2286 i2c5 Choose the I2C5 bus (configure with the i2c4
2287 overlay - BCM2711 only)
2289 i2c6 Choose the I2C6 bus (configure with the i2c6
2290 overlay - BCM2711 only)
2294 Info: Change i2c0 pin usage. Not all pin combinations are usable on all
2295 platforms - platforms other then Compute Modules can only use this
2296 to disable transaction combining.
2297 Do NOT use in conjunction with dtparam=i2c_vc=on. From the 5.4 kernel
2298 onwards the base DT includes the use of i2c_mux_pinctrl to expose two
2299 muxings of BSC0 - GPIOs 0&1, and whichever combination is used for the
2300 camera and display connectors. This overlay disables that mux and
2301 configures /dev/i2c0 to point at whichever set of pins is requested.
2302 dtparam=i2c_vc=on will try and enable the mux, so combining the two
2303 will cause conflicts.
2304 Load: dtoverlay=i2c0,<param>=<val>
2305 Params: pins_0_1 Use pins 0 and 1 (default)
2306 pins_28_29 Use pins 28 and 29
2307 pins_44_45 Use pins 44 and 45
2308 pins_46_47 Use pins 46 and 47
2309 combine Allow transactions to be combined (default
2314 Info: Deprecated, legacy version of i2c0.
2319 Info: Enable i2c0 (Pi 5 only)
2320 Load: dtoverlay=i2c0-pi5,<param>=<val>
2321 Params: pins_0_1 Use GPIOs 0 and 1 (default)
2322 pins_8_9 Use GPIOs 8 and 9
2323 baudrate Set the baudrate for the interface (default
2328 Info: Change i2c1 pin usage. Not all pin combinations are usable on all
2329 platforms - platforms other then Compute Modules can only use this
2330 to disable transaction combining.
2331 Load: dtoverlay=i2c1,<param>=<val>
2332 Params: pins_2_3 Use pins 2 and 3 (default)
2333 pins_44_45 Use pins 44 and 45
2334 combine Allow transactions to be combined (default
2339 Info: Deprecated, legacy version of i2c1.
2344 Info: Enable i2c1 (Pi 5 only)
2345 Load: dtoverlay=i2c1-pi5,<param>=<val>
2346 Params: pins_2_3 Use GPIOs 2 and 3 (default)
2347 pins_10_11 Use GPIOs 10 and 11
2348 baudrate Set the baudrate for the interface (default
2353 Info: Enable i2c2 (Pi 5 only)
2354 Load: dtoverlay=i2c2-pi5,<param>=<val>
2355 Params: pins_4_5 Use GPIOs 4 and 5 (default)
2356 pins_12_13 Use GPIOs 12 and 13
2357 baudrate Set the baudrate for the interface (default
2362 Info: Enable the i2c3 bus. BCM2711 only.
2363 Load: dtoverlay=i2c3,<param>
2364 Params: pins_2_3 Use GPIOs 2 and 3
2365 pins_4_5 Use GPIOs 4 and 5 (default)
2366 baudrate Set the baudrate for the interface (default
2371 Info: Enable i2c3 (Pi 5 only)
2372 Load: dtoverlay=i2c3-pi5,<param>=<val>
2373 Params: pins_6_7 Use GPIOs 6 and 7 (default)
2374 pins_14_15 Use GPIOs 14 and 15
2375 pins_22_23 Use GPIOs 22 and 23
2376 baudrate Set the baudrate for the interface (default
2381 Info: Enable the i2c4 bus. BCM2711 only.
2382 Load: dtoverlay=i2c4,<param>
2383 Params: pins_6_7 Use GPIOs 6 and 7
2384 pins_8_9 Use GPIOs 8 and 9 (default)
2385 baudrate Set the baudrate for the interface (default
2390 Info: Enable the i2c5 bus. BCM2711 only.
2391 Load: dtoverlay=i2c5,<param>
2392 Params: pins_10_11 Use GPIOs 10 and 11
2393 pins_12_13 Use GPIOs 12 and 13 (default)
2394 baudrate Set the baudrate for the interface (default
2399 Info: Enable the i2c6 bus. BCM2711 only.
2400 Load: dtoverlay=i2c6,<param>
2401 Params: pins_0_1 Use GPIOs 0 and 1
2402 pins_22_23 Use GPIOs 22 and 23 (default)
2403 baudrate Set the baudrate for the interface (default
2408 Info: Configures any passive I2S DAC soundcard.
2409 Load: dtoverlay=i2s-dac
2414 Info: move I2S function block to GPIO 28 to 31
2415 Load: dtoverlay=i2s-gpio28-31
2420 Info: Enables I2C connected Ilitek 251x multiple touch controller using
2421 GPIO 4 (pin 7 on GPIO header) for interrupt.
2422 Load: dtoverlay=ilitek251x,<param>=<val>
2423 Params: interrupt GPIO used for interrupt (default 4)
2424 sizex Touchscreen size x, horizontal resolution of
2425 touchscreen (in pixels)
2426 sizey Touchscreen size y, vertical resolution of
2427 touchscreen (in pixels)
2431 Info: Sony IMX219 camera module.
2432 Uses Unicam 1, which is the standard camera connector on most Pi
2434 Load: dtoverlay=imx219,<param>=<val>
2435 Params: rotation Mounting rotation of the camera sensor (0 or
2437 orientation Sensor orientation (0 = front, 1 = rear,
2438 2 = external, default external)
2439 media-controller Configure use of Media Controller API for
2440 configuring the sensor (default on)
2441 cam0 Adopt the default configuration for CAM0 on a
2442 Compute Module (CSI0, i2c_vc, and cam0_reg).
2443 vcm Configure a VCM focus drive on the sensor.
2447 Info: Sony IMX258 camera module.
2448 Uses Unicam 1, which is the standard camera connector on most Pi
2450 Load: dtoverlay=imx258,<param>=<val>
2451 Params: rotation Mounting rotation of the camera sensor (0 or
2453 orientation Sensor orientation (0 = front, 1 = rear,
2454 2 = external, default external)
2455 media-controller Configure use of Media Controller API for
2456 configuring the sensor (default on)
2457 cam0 Adopt the default configuration for CAM0 on a
2458 Compute Module (CSI0, i2c_vc, and cam0_reg).
2459 vcm Configure a VCM focus drive on the sensor.
2460 4lane Enable 4 CSI2 lanes. This requires a Compute
2461 Module (1, 3, or 4).
2465 Info: Sony IMX290 camera module.
2466 Uses Unicam 1, which is the standard camera connector on most Pi
2468 Load: dtoverlay=imx290,<param>
2469 Params: 4lane Enable 4 CSI2 lanes. This requires a Compute
2470 Module (1, 3, or 4).
2471 clock-frequency Sets the clock frequency to match that used on
2473 Modules from Vision Components use 37.125MHz
2474 (the default), whilst those from Innomaker use
2476 mono Denote that the module is a mono sensor.
2477 orientation Sensor orientation (0 = front, 1 = rear,
2478 2 = external, default external)
2479 rotation Mounting rotation of the camera sensor (0 or
2481 media-controller Configure use of Media Controller API for
2482 configuring the sensor (default on)
2483 cam0 Adopt the default configuration for CAM0 on a
2484 Compute Module (CSI0, i2c_vc, and cam0_reg).
2488 Info: Sony IMX296 camera module.
2489 Uses Unicam 1, which is the standard camera connector on most Pi
2491 Load: dtoverlay=imx296,<param>=<val>
2492 Params: rotation Mounting rotation of the camera sensor (0 or
2494 orientation Sensor orientation (0 = front, 1 = rear,
2495 2 = external, default external)
2496 media-controller Configure use of Media Controller API for
2497 configuring the sensor (default on)
2498 cam0 Adopt the default configuration for CAM0 on a
2499 Compute Module (CSI0, i2c_vc, and cam0_reg).
2500 clock-frequency Sets the clock frequency to match that used on
2501 the board, which should be one of 54000000
2502 (the default), 37125000 or 74250000.
2506 Info: Sony IMX327 camera module.
2507 Uses Unicam 1, which is the standard camera connector on most Pi
2509 Load: dtoverlay=imx327,<param>
2510 Params: 4lane Enable 4 CSI2 lanes. This requires a Compute
2511 Module (1, 3, or 4).
2512 clock-frequency Sets the clock frequency to match that used on
2514 Modules from Vision Components use 37.125MHz
2515 (the default), whilst those from Innomaker use
2517 mono Denote that the module is a mono sensor.
2518 orientation Sensor orientation (0 = front, 1 = rear,
2519 2 = external, default external)
2520 rotation Mounting rotation of the camera sensor (0 or
2522 media-controller Configure use of Media Controller API for
2523 configuring the sensor (default on)
2524 cam0 Adopt the default configuration for CAM0 on a
2525 Compute Module (CSI0, i2c_vc, and cam0_reg).
2529 Info: Sony IMX378 camera module.
2530 Uses Unicam 1, which is the standard camera connector on most Pi
2532 Load: dtoverlay=imx378,<param>=<val>
2533 Params: rotation Mounting rotation of the camera sensor (0 or
2535 orientation Sensor orientation (0 = front, 1 = rear,
2536 2 = external, default external)
2537 media-controller Configure use of Media Controller API for
2538 configuring the sensor (default on)
2539 cam0 Adopt the default configuration for CAM0 on a
2540 Compute Module (CSI0, i2c_vc, and cam0_reg).
2544 Info: Sony IMX462 camera module.
2545 Uses Unicam 1, which is the standard camera connector on most Pi
2547 Load: dtoverlay=imx462,<param>
2548 Params: 4lane Enable 4 CSI2 lanes. This requires a Compute
2549 Module (1, 3, or 4).
2550 clock-frequency Sets the clock frequency to match that used on
2552 Modules from Vision Components use 37.125MHz
2553 (the default), whilst those from Innomaker use
2555 mono Denote that the module is a mono sensor.
2556 orientation Sensor orientation (0 = front, 1 = rear,
2557 2 = external, default external)
2558 rotation Mounting rotation of the camera sensor (0 or
2560 media-controller Configure use of Media Controller API for
2561 configuring the sensor (default on)
2562 cam0 Adopt the default configuration for CAM0 on a
2563 Compute Module (CSI0, i2c_vc, and cam0_reg).
2567 Info: Sony IMX477 camera module.
2568 Uses Unicam 1, which is the standard camera connector on most Pi
2570 Load: dtoverlay=imx477,<param>=<val>
2571 Params: rotation Mounting rotation of the camera sensor (0 or
2573 orientation Sensor orientation (0 = front, 1 = rear,
2574 2 = external, default external)
2575 media-controller Configure use of Media Controller API for
2576 configuring the sensor (default on)
2577 cam0 Adopt the default configuration for CAM0 on a
2578 Compute Module (CSI0, i2c_vc, and cam0_reg).
2582 Info: Sony IMX519 camera module.
2583 Uses Unicam 1, which is the standard camera connector on most Pi
2585 Load: dtoverlay=imx519,<param>=<val>
2586 Params: rotation Mounting rotation of the camera sensor (0 or
2588 orientation Sensor orientation (0 = front, 1 = rear,
2589 2 = external, default external)
2590 media-controller Configure use of Media Controller API for
2591 configuring the sensor (default on)
2592 cam0 Adopt the default configuration for CAM0 on a
2593 Compute Module (CSI0, i2c_vc, and cam0_reg).
2594 vcm Select lens driver state. Default is enabled,
2595 but vcm=off will disable.
2599 Info: Sony IMX708 camera module.
2600 Uses Unicam 1, which is the standard camera connector on most Pi
2602 Load: dtoverlay=imx708,<param>=<val>
2603 Params: rotation Mounting rotation of the camera sensor (0 or
2605 orientation Sensor orientation (0 = front, 1 = rear,
2606 2 = external, default external)
2607 vcm Select lens driver state. Default is enabled,
2608 but vcm=off will disable.
2609 media-controller Configure use of Media Controller API for
2610 configuring the sensor (default on)
2611 cam0 Adopt the default configuration for CAM0 on a
2612 Compute Module (CSI0, i2c_vc, and cam0_reg).
2613 link-frequency Allowable link frequency values to use in Hz:
2614 450000000 (default), 447000000, 453000000.
2618 Info: Configures the IQaudio Codec audio card
2619 Load: dtoverlay=iqaudio-codec
2624 Info: Configures the IQaudio DAC audio card
2625 Load: dtoverlay=iqaudio-dac,<param>
2626 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
2627 Digital volume control. Enable with
2628 "dtoverlay=iqaudio-dac,24db_digital_gain"
2629 (The default behaviour is that the Digital
2630 volume control is limited to a maximum of
2631 0dB. ie. it can attenuate but not provide
2632 gain. For most users, this will be desired
2633 as it will prevent clipping. By appending
2634 the 24db_digital_gain parameter, the Digital
2635 volume control will allow up to 24dB of
2636 gain. If this parameter is enabled, it is the
2637 responsibility of the user to ensure that
2638 the Digital volume control is set to a value
2639 that does not result in clipping/distortion!)
2642 Name: iqaudio-dacplus
2643 Info: Configures the IQaudio DAC+ audio card
2644 Load: dtoverlay=iqaudio-dacplus,<param>=<val>
2645 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
2646 Digital volume control. Enable with
2647 "dtoverlay=iqaudio-dacplus,24db_digital_gain"
2648 (The default behaviour is that the Digital
2649 volume control is limited to a maximum of
2650 0dB. ie. it can attenuate but not provide
2651 gain. For most users, this will be desired
2652 as it will prevent clipping. By appending
2653 the 24db_digital_gain parameter, the Digital
2654 volume control will allow up to 24dB of
2655 gain. If this parameter is enabled, it is the
2656 responsibility of the user to ensure that
2657 the Digital volume control is set to a value
2658 that does not result in clipping/distortion!)
2659 auto_mute_amp If specified, unmute/mute the IQaudIO amp when
2660 starting/stopping audio playback.
2661 unmute_amp If specified, unmute the IQaudIO amp once when
2662 the DAC driver module loads.
2665 Name: iqaudio-digi-wm8804-audio
2666 Info: Configures the IQAudIO Digi WM8804 audio card
2667 Load: dtoverlay=iqaudio-digi-wm8804-audio,<param>=<val>
2668 Params: card_name Override the default, "IQAudIODigi", card name.
2669 dai_name Override the default, "IQAudIO Digi", dai name.
2670 dai_stream_name Override the default, "IQAudIO Digi HiFi",
2675 Info: Enables I2C connected Azoteq IQS550 trackpad/touchscreen controller
2676 using GPIO 4 (pin 7 on GPIO header) for interrupt.
2677 Load: dtoverlay=iqs550,<param>=<val>
2678 Params: interrupt GPIO used for interrupt (default 4)
2679 reset GPIO used for reset (optional)
2680 sizex Touchscreen size x (default 800)
2681 sizey Touchscreen size y (default 480)
2682 invx Touchscreen inverted x axis
2683 invy Touchscreen inverted y axis
2684 swapxy Touchscreen swapped x y axis
2688 Info: Infineon irs1125 TOF camera module.
2689 Uses Unicam 1, which is the standard camera connector on most Pi
2691 Load: dtoverlay=irs1125,<param>=<val>
2692 Params: media-controller Configure use of Media Controller API for
2693 configuring the sensor (default off)
2694 cam0 Adopt the default configuration for CAM0 on a
2695 Compute Module (CSI0, i2c_vc, and cam0_reg).
2699 Info: Adds support for JEDEC-compliant SPI NOR flash devices. (Note: The
2700 "jedec,spi-nor" kernel driver was formerly known as "m25p80".)
2701 Load: dtoverlay=jedec-spi-nor,<param>=<val>
2702 Params: spi<n>-<m> Enable flash device on SPI<n>, CS#<m>
2703 fastr Add fast read capability to the flash device
2704 speed Maximum SPI frequency (Hz)
2705 flash-spi<n>-<m> Same as spi<n>-<m> (deprecated)
2706 flash-fastr-spi<n>-<m> Same as spi<n>->m>,fastr (deprecated)
2710 Info: Simultaneous usage of an justboom-dac and justboom-digi based
2712 Load: dtoverlay=justboom-both,<param>=<val>
2713 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
2714 Digital volume control. Enable with
2715 "dtoverlay=justboom-dac,24db_digital_gain"
2716 (The default behaviour is that the Digital
2717 volume control is limited to a maximum of
2718 0dB. ie. it can attenuate but not provide
2719 gain. For most users, this will be desired
2720 as it will prevent clipping. By appending
2721 the 24dB_digital_gain parameter, the Digital
2722 volume control will allow up to 24dB of
2723 gain. If this parameter is enabled, it is the
2724 responsibility of the user to ensure that
2725 the Digital volume control is set to a value
2726 that does not result in clipping/distortion!)
2730 Info: Configures the JustBoom DAC HAT, Amp HAT, DAC Zero and Amp Zero audio
2732 Load: dtoverlay=justboom-dac,<param>=<val>
2733 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
2734 Digital volume control. Enable with
2735 "dtoverlay=justboom-dac,24db_digital_gain"
2736 (The default behaviour is that the Digital
2737 volume control is limited to a maximum of
2738 0dB. ie. it can attenuate but not provide
2739 gain. For most users, this will be desired
2740 as it will prevent clipping. By appending
2741 the 24dB_digital_gain parameter, the Digital
2742 volume control will allow up to 24dB of
2743 gain. If this parameter is enabled, it is the
2744 responsibility of the user to ensure that
2745 the Digital volume control is set to a value
2746 that does not result in clipping/distortion!)
2750 Info: Configures the JustBoom Digi HAT and Digi Zero audio cards
2751 Load: dtoverlay=justboom-digi
2756 Info: This overlay has been deprecated and removed - see gpio-ir
2761 Info: Adds support for the ltc294x family of battery gauges
2762 Load: dtoverlay=ltc294x,<param>=<val>
2763 Params: ltc2941 Select the ltc2941 device
2765 ltc2942 Select the ltc2942 device
2767 ltc2943 Select the ltc2943 device
2769 ltc2944 Select the ltc2944 device
2771 resistor-sense The sense resistor value in milli-ohms.
2772 Can be a 32-bit negative value when the battery
2773 has been connected to the wrong end of the
2776 prescaler-exponent Range and accuracy of the gauge. The value is
2777 programmed into the chip only if it differs
2778 from the current setting.
2780 - Default value is 128
2781 - the exponent is in the range 0-7 (default 7)
2782 See the datasheet for more information.
2786 Info: Configures the Maxim MAX98357A I2S DAC
2787 Load: dtoverlay=max98357a,<param>=<val>
2788 Params: no-sdmode Driver does not manage the state of the DAC's
2789 SD_MODE pin (i.e. chip is always on).
2790 sdmode-pin integer, GPIO pin connected to the SD_MODE input
2791 of the DAC (default GPIO4 if parameter omitted).
2795 Info: Configure a MAX6675, MAX31855 or MAX31856 thermocouple as an IIO device.
2797 For devices on spi1 or spi2, the interfaces should be enabled
2798 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
2799 The overlay expects to disable the relevant spidev node, so also using
2800 e.g. cs0_spidev=off is unnecessary.
2803 MAX31855 on /dev/spidev0.0
2804 dtoverlay=maxtherm,spi0-0,max31855
2805 MAX31856 using a type J thermocouple on /dev/spidev2.1
2807 dtoverlay=maxtherm,spi2-1,max31856,type_j
2809 Load: dtoverlay=maxtherm,<param>=<val>
2810 Params: spi<n>-<m> Configure device at spi<n>, cs<m>
2812 max6675 Enable support for the MAX6675 (default)
2813 max31855 Enable support for the MAX31855
2814 max31855e Enable support for the MAX31855E
2815 max31855j Enable support for the MAX31855J
2816 max31855k Enable support for the MAX31855K
2817 max31855n Enable support for the MAX31855N
2818 max31855r Enable support for the MAX31855R
2819 max31855s Enable support for the MAX31855S
2820 max31855t Enable support for the MAX31855T
2821 max31856 Enable support for the MAX31856 (with type K)
2822 type_b Select a type B sensor for max31856
2823 type_e Select a type E sensor for max31856
2824 type_j Select a type J sensor for max31856
2825 type_k Select a type K sensor for max31856
2826 type_n Select a type N sensor for max31856
2827 type_r Select a type R sensor for max31856
2828 type_s Select a type S sensor for max31856
2829 type_t Select a type T sensor for max31856
2833 Info: Configures the mbed AudioCODEC (TLV320AIC23B)
2834 Load: dtoverlay=mbed-dac
2839 Info: Configures the MCP23017 I2C GPIO expander
2840 Load: dtoverlay=mcp23017,<param>=<val>
2841 Params: gpiopin Gpio pin connected to the INTA output of the
2842 MCP23017 (default: 4)
2844 addr I2C address of the MCP23017 (default: 0x20)
2846 mcp23008 Configure an MCP23008 instead.
2847 noints Disable the interrupt GPIO line.
2848 i2c0 Choose the I2C0 bus on GPIOs 0&1
2849 i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
2850 i2c3 Choose the I2C3 bus (configure with the i2c3
2851 overlay - BCM2711 only)
2852 i2c4 Choose the I2C4 bus (configure with the i2c4
2853 overlay - BCM2711 only)
2854 i2c5 Choose the I2C5 bus (configure with the i2c5
2855 overlay - BCM2711 only)
2856 i2c6 Choose the I2C6 bus (configure with the i2c6
2857 overlay - BCM2711 only)
2861 Info: Configures the MCP23S08/17 SPI GPIO expanders.
2862 If devices are present on SPI1 or SPI2, those interfaces must be enabled
2863 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
2864 If interrupts are enabled for a device on a given CS# on a SPI bus, that
2865 device must be the only one present on that SPI bus/CS#.
2866 Load: dtoverlay=mcp23s17,<param>=<val>
2867 Params: s08-spi<n>-<m>-present 4-bit integer, bitmap indicating MCP23S08
2868 devices present on SPI<n>, CS#<m>
2870 s17-spi<n>-<m>-present 8-bit integer, bitmap indicating MCP23S17
2871 devices present on SPI<n>, CS#<m>
2873 s08-spi<n>-<m>-int-gpio integer, enables interrupts on a single
2874 MCP23S08 device on SPI<n>, CS#<m>, specifies
2875 the GPIO pin to which INT output of MCP23S08
2878 s17-spi<n>-<m>-int-gpio integer, enables mirrored interrupts on a
2879 single MCP23S17 device on SPI<n>, CS#<m>,
2880 specifies the GPIO pin to which either INTA
2881 or INTB output of MCP23S17 is connected.
2885 Info: Configures the MCP2515 CAN controller on spi0/1/2
2886 For devices on spi1 or spi2, the interfaces should be enabled
2887 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
2888 Load: dtoverlay=mcp2515,<param>=<val>
2889 Params: spi<n>-<m> Configure device at spi<n>, cs<m>
2892 oscillator Clock frequency for the CAN controller (Hz)
2894 speed Maximum SPI frequence (Hz)
2896 interrupt GPIO for interrupt signal
2900 Info: Configures the MCP2515 CAN controller on spi0.0
2901 Load: dtoverlay=mcp2515-can0,<param>=<val>
2902 Params: oscillator Clock frequency for the CAN controller (Hz)
2904 spimaxfrequency Maximum SPI frequence (Hz)
2906 interrupt GPIO for interrupt signal
2910 Info: Configures the MCP2515 CAN controller on spi0.1
2911 Load: dtoverlay=mcp2515-can1,<param>=<val>
2912 Params: oscillator Clock frequency for the CAN controller (Hz)
2914 spimaxfrequency Maximum SPI frequence (Hz)
2916 interrupt GPIO for interrupt signal
2920 Info: Configures the MCP251XFD CAN controller family
2921 For devices on spi1 or spi2, the interfaces should be enabled
2922 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
2923 Load: dtoverlay=mcp251xfd,<param>=<val>
2924 Params: spi<n>-<m> Configure device at spi<n>, cs<m>
2927 oscillator Clock frequency for the CAN controller (Hz)
2929 speed Maximum SPI frequence (Hz)
2931 interrupt GPIO for interrupt signal
2933 rx_interrupt GPIO for RX interrupt signal (nINT1) (optional)
2935 xceiver_enable GPIO for CAN transceiver enable (optional)
2937 xceiver_active_high specifiy if CAN transceiver enable pin is
2938 active high (optional, default: active low)
2942 Info: Configures MCP3008 A/D converters
2943 For devices on spi1 or spi2, the interfaces should be enabled
2944 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
2945 Load: dtoverlay=mcp3008,<param>[=<val>]
2946 Params: spi<n>-<m>-present boolean, configure device at spi<n>, cs<m>
2947 spi<n>-<m>-speed integer, set the spi bus speed for this device
2951 Info: Configures MCP3202 A/D converters
2952 For devices on spi1 or spi2, the interfaces should be enabled
2953 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
2954 Load: dtoverlay=mcp3202,<param>[=<val>]
2955 Params: spi<n>-<m>-present boolean, configure device at spi<n>, cs<m>
2956 spi<n>-<m>-speed integer, set the spi bus speed for this device
2960 Info: Overlay for activation of Microchip MCP3421-3428 ADCs over I2C
2961 Load: dtoverlay=mcp342x,<param>=<val>
2962 Params: addr I2C bus address of device, for devices with
2963 addresses that are configurable, e.g. by
2964 hardware links (default=0x68)
2965 mcp3421 The device is an MCP3421
2966 mcp3422 The device is an MCP3422
2967 mcp3423 The device is an MCP3423
2968 mcp3424 The device is an MCP3424
2969 mcp3425 The device is an MCP3425
2970 mcp3426 The device is an MCP3426
2971 mcp3427 The device is an MCP3427
2972 mcp3428 The device is an MCP3428
2976 Info: Media Center HAT - 2.83" Touch Display + extras by Pi Supply
2977 Load: dtoverlay=media-center,<param>=<val>
2978 Params: speed Display SPI bus speed
2979 rotate Display rotation {0,90,180,270}
2980 fps Delay between frame updates
2981 xohms Touchpanel sensitivity (X-plate resistance)
2982 swapxy Swap x and y axis
2983 backlight Change backlight GPIO pin {e.g. 12, 18}
2984 debug "on" = enable additional debug messages
2989 Info: Configures the merus-amp audio card
2990 Load: dtoverlay=merus-amp
2995 Info: Configures UART0 (ttyAMA0) so that a requested 38.4kbaud actually gets
2996 31.25kbaud, the frequency required for MIDI
2997 Load: dtoverlay=midi-uart0
3001 Name: midi-uart0-pi5
3002 Info: See midi-uart0 (this is the Pi 5 version)
3006 Info: Configures UART1 (ttyS0) so that a requested 38.4kbaud actually gets
3007 31.25kbaud, the frequency required for MIDI
3008 Load: dtoverlay=midi-uart1
3012 Name: midi-uart1-pi5
3013 Info: See midi-uart1 (this is the Pi 5 version)
3017 Info: Configures UART2 (ttyAMA2) so that a requested 38.4kbaud actually gets
3018 31.25kbaud, the frequency required for MIDI
3019 Load: dtoverlay=midi-uart2
3023 Name: midi-uart2-pi5
3024 Info: See midi-uart2 (this is the Pi 5 version)
3028 Info: Configures UART3 (ttyAMA3) so that a requested 38.4kbaud actually gets
3029 31.25kbaud, the frequency required for MIDI
3030 Load: dtoverlay=midi-uart3
3034 Name: midi-uart3-pi5
3035 Info: See midi-uart3 (this is the Pi 5 version)
3039 Info: Configures UART4 (ttyAMA4) so that a requested 38.4kbaud actually gets
3040 31.25kbaud, the frequency required for MIDI
3041 Load: dtoverlay=midi-uart4
3045 Name: midi-uart4-pi5
3046 Info: See midi-uart4 (this is the Pi 5 version)
3050 Info: Configures UART5 (ttyAMA5) so that a requested 38.4kbaud actually gets
3051 31.25kbaud, the frequency required for MIDI
3052 Load: dtoverlay=midi-uart5
3057 Info: Overlay for AdaFruit Mini Pi 1.3" TFT via SPI using fbtft driver.
3058 Load: dtoverlay=minipitft13,<param>=<val>
3059 Params: speed SPI bus speed (default 32000000)
3060 rotate Display rotation (0, 90, 180 or 270; default 0)
3061 width Display width (default 240)
3062 height Display height (default 240)
3063 fps Delay between frame updates (default 25)
3064 debug Debug output level (0-7; default 0)
3068 Info: Switch the onboard Bluetooth function of a BT-equipped Raspberry Pi
3069 to use the mini-UART (ttyS0) and restore UART0/ttyAMA0 over GPIOs 14 &
3070 15. Note that this option uses a lower baudrate, and should only be used
3071 with low-bandwidth peripherals.
3072 Load: dtoverlay=miniuart-bt,<param>=<val>
3073 Params: krnbt Set to "off" to disable autoprobing of Bluetooth
3074 driver without need of hciattach/btattach
3078 Info: Overlay for SPI-connected MIPI DBI displays using the panel-mipi-dbi
3079 driver. The driver will load a file /lib/firmware/panel.bin containing
3080 the initialisation commands.
3083 dtoverlay=mipi-dbi-spi,spi0-0,speed=70000000
3084 dtparam=width=320,height=240
3085 dtparam=reset-gpio=23,dc-gpio=24
3086 dtparam=backlight-gpio=18
3088 Compared to fbtft panel-mipi-dbi runs pixel data at spi-max-frequency
3089 and init commands at 10MHz. This makes it possible to push the envelope
3090 without messing up the controller configuration due to command
3091 transmission errors.
3093 For devices on spi1 or spi2, the interfaces should be enabled
3094 with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
3096 See https://github.com/notro/panel-mipi-dbi/wiki for more info.
3098 Load: dtoverlay=mipi-dbi-spi,<param>=<val>
3100 compatible Set the compatible string to load a different
3101 firmware file. Both the panel compatible value
3102 used to load the firmware file and the value
3103 used to load the driver has to be set having a
3104 NUL (\0) separator between them.
3106 dtparam=compatible=mypanel\0panel-mipi-dbi-spi
3107 spi<n>-<m> Configure device at spi<n>, cs<m>
3109 speed SPI bus speed in Hz (default 32000000)
3110 cpha Shifted SPI clock phase (CPHA) mode
3111 cpol Inverse SPI clock polarity (CPOL) mode
3112 write-only Controller is not readable
3113 (ie. MISO is not wired up).
3115 width Panel width in pixels (required)
3116 height Panel height in pixels (required)
3117 width-mm Panel width in mm
3118 height-mm Panel height in mm
3119 x-offset Panel x-offset in controller RAM
3120 y-offset Panel y-offset in controller RAM
3122 clock-frequency Panel clock frequency in Hz
3123 (optional, just informational).
3125 reset-gpio GPIO pin to be used for RESET
3126 dc-gpio GPIO pin to be used for D/C
3128 backlight-gpio GPIO pin to be used for backlight control
3130 backlight-pwm PWM channel to be used for backlight control
3131 (default of none). NB Disables audio headphone
3132 output as that also uses PWM.
3133 backlight-pwm-chan Choose channel on &pwm node for backlight
3134 control (default 0).
3135 backlight-pwm-gpio GPIO pin to be used for the PWM backlight. See
3136 pwm-2chan for valid options (default 18).
3137 backlight-pwm-func Pin function of GPIO used for the PWM backlight.
3138 See pwm-2chan for valid options (default 2).
3139 backlight-def-brightness
3140 Set the default brightness. Normal range 1-16.
3145 Info: Overlay for i2c connected mlx90640 thermal camera
3146 Load: dtoverlay=mlx90640
3151 Info: Selects the bcm2835-mmc SD/MMC driver, optionally with overclock
3152 Load: dtoverlay=mmc,<param>=<val>
3153 Params: overclock_50 Clock (in MHz) to use when the MMC framework
3158 Info: This overlay has been deprecated - use "dtoverlay=i2c-sensor,mpu6050"
3159 instead. Note that "int_pin" is the new name for the "interrupt"
3165 Info: MZ61581 display by Tontec
3166 Load: dtoverlay=mz61581,<param>=<val>
3167 Params: speed Display SPI bus speed
3169 rotate Display rotation {0,90,180,270}
3171 fps Delay between frame updates
3173 txbuflen Transmit buffer length (default 32768)
3175 debug Debug output level {0-7}
3177 xohms Touchpanel sensitivity (X-plate resistance)
3181 Info: Omnivision OV2311 camera module.
3182 Uses Unicam 1, which is the standard camera connector on most Pi
3184 Load: dtoverlay=ov2311,<param>=<val>
3185 Params: rotation Mounting rotation of the camera sensor (0 or
3187 orientation Sensor orientation (0 = front, 1 = rear,
3188 2 = external, default external)
3189 media-controller Configure use of Media Controller API for
3190 configuring the sensor (default on)
3191 cam0 Adopt the default configuration for CAM0 on a
3192 Compute Module (CSI0, i2c_vc, and cam0_reg).
3196 Info: Omnivision OV5647 camera module.
3197 Uses Unicam 1, which is the standard camera connector on most Pi
3199 Load: dtoverlay=ov5647,<param>=<val>
3200 Params: rotation Mounting rotation of the camera sensor (0 or
3202 orientation Sensor orientation (0 = front, 1 = rear,
3203 2 = external, default external)
3204 media-controller Configure use of Media Controller API for
3205 configuring the sensor (default on)
3206 cam0 Adopt the default configuration for CAM0 on a
3207 Compute Module (CSI0, i2c_vc, and cam0_reg).
3208 vcm Configure a VCM focus drive on the sensor.
3212 Info: Omnivision OV7251 camera module.
3213 Uses Unicam 1, which is the standard camera connector on most Pi
3215 Load: dtoverlay=ov7251,<param>=<val>
3216 Params: rotation Mounting rotation of the camera sensor (0 or
3218 orientation Sensor orientation (0 = front, 1 = rear,
3219 2 = external, default external)
3220 media-controller Configure use of Media Controller API for
3221 configuring the sensor (default off)
3222 cam0 Adopt the default configuration for CAM0 on a
3223 Compute Module (CSI0, i2c_vc, and cam0_reg).
3227 Info: Omnivision OV9281 camera module.
3228 Uses Unicam 1, which is the standard camera connector on most Pi
3230 Load: dtoverlay=ov9281,<param>=<val>
3231 Params: rotation Mounting rotation of the camera sensor (0 or
3233 orientation Sensor orientation (0 = front, 1 = rear,
3234 2 = external, default external)
3235 media-controller Configure use of Media Controller API for
3236 configuring the sensor (default on)
3237 cam0 Adopt the default configuration for CAM0 on a
3238 Compute Module (CSI0, i2c_vc, and cam0_reg).
3242 Info: PaPiRus ePaper Screen by Pi Supply (both HAT and pHAT)
3243 Load: dtoverlay=papirus,<param>=<val>
3244 Params: panel Display panel (required):
3249 speed Display SPI bus speed
3253 Info: TI PCA953x family of I2C GPIO expanders. Default is for NXP PCA9534.
3254 Load: dtoverlay=pca953x,<param>=<val>
3255 Params: addr I2C address of expander. Default 0x20.
3256 pca6416 Select the NXP PCA6416 (16 bit)
3257 pca9505 Select the NXP PCA9505 (40 bit)
3258 pca9535 Select the NXP PCA9535 (16 bit)
3259 pca9536 Select the NXP PCA9536 or TI PCA9536 (4 bit)
3260 pca9537 Select the NXP PCA9537 (4 bit)
3261 pca9538 Select the NXP PCA9538 (8 bit)
3262 pca9539 Select the NXP PCA9539 (16 bit)
3263 pca9554 Select the NXP PCA9554 (8 bit)
3264 pca9555 Select the NXP PCA9555 (16 bit)
3265 pca9556 Select the NXP PCA9556 (8 bit)
3266 pca9557 Select the NXP PCA9557 (8 bit)
3267 pca9574 Select the NXP PCA9574 (8 bit)
3268 pca9575 Select the NXP PCA9575 (16 bit)
3269 pca9698 Select the NXP PCA9698 (40 bit)
3270 pcal6416 Select the NXP PCAL6416 (16 bit)
3271 pcal6524 Select the NXP PCAL6524 (24 bit)
3272 pcal9555a Select the NXP PCAL9555A (16 bit)
3273 max7310 Select the Maxim MAX7310 (8 bit)
3274 max7312 Select the Maxim MAX7312 (16 bit)
3275 max7313 Select the Maxim MAX7313 (16 bit)
3276 max7315 Select the Maxim MAX7315 (8 bit)
3277 pca6107 Select the TI PCA6107 (8 bit)
3278 tca6408 Select the TI TCA6408 (8 bit)
3279 tca6416 Select the TI TCA6416 (16 bit)
3280 tca6424 Select the TI TCA6424 (24 bit)
3281 tca9539 Select the TI TCA9539 (16 bit)
3282 tca9554 Select the TI TCA9554 (8 bit)
3283 cat9554 Select the Onnn CAT9554 (8 bit)
3284 pca9654 Select the Onnn PCA9654 (8 bit)
3285 xra1202 Select the Exar XRA1202 (8 bit)
3289 Info: NXP PCF857x family of I2C GPIO expanders.
3290 Load: dtoverlay=pcf857x,<param>=<val>
3291 Params: addr I2C address of expander. Default
3292 depends on model selected.
3293 pcf8574 Select the NXP PCF8574 (8 bit)
3294 pcf8574a Select the NXP PCF8574A (8 bit)
3295 pcf8575 Select the NXP PCF8575 (16 bit)
3296 pca8574 Select the NXP PCA8574 (8 bit)
3299 Name: pcie-32bit-dma
3300 Info: Force PCIe config to support 32bit DMA addresses at the expense of
3301 having to bounce buffers.
3302 Load: dtoverlay=pcie-32bit-dma
3306 [ The pcf2127-rtc overlay has been deleted. See i2c-rtc. ]
3309 [ The pcf8523-rtc overlay has been deleted. See i2c-rtc. ]
3312 [ The pcf8563-rtc overlay has been deleted. See i2c-rtc. ]
3316 Info: This overlay has been renamed act-led, keeping pi3-act-led as an alias
3317 for backwards compatibility.
3321 Name: pi3-disable-bt
3322 Info: This overlay has been renamed disable-bt, keeping pi3-disable-bt as an
3323 alias for backwards compatibility.
3327 Name: pi3-disable-wifi
3328 Info: This overlay has been renamed disable-wifi, keeping pi3-disable-wifi as
3329 an alias for backwards compatibility.
3333 Name: pi3-miniuart-bt
3334 Info: This overlay has been renamed miniuart-bt, keeping pi3-miniuart-bt as
3335 an alias for backwards compatibility.
3340 Info: Configures the pibell audio card.
3341 Load: dtoverlay=pibell,<param>=<val>
3342 Params: alsaname Set the name as it appears in ALSA (default
3347 Info: Configures the PiFace Digital mcp23s17 GPIO port expander.
3348 Load: dtoverlay=pifacedigital,<param>=<val>
3349 Params: spi-present-mask 8-bit integer, bitmap indicating MCP23S17 SPI0
3350 CS0 address. PiFace Digital supports addresses
3351 0-3, which can be configured with JP1 and JP2.
3355 Info: Configures the PiFi 40W stereo amplifier
3356 Load: dtoverlay=pifi-40
3361 Info: Configures the PiFi DAC HD
3362 Load: dtoverlay=pifi-dac-hd
3367 Info: Configures the PiFi DAC Zero
3368 Load: dtoverlay=pifi-dac-zero
3373 Info: Configures the PiFi Mini stereo amplifier
3374 Load: dtoverlay=pifi-mini-210
3379 Info: Configures the PiGlow by pimoroni.com
3380 Load: dtoverlay=piglow
3385 Info: PiScreen display by OzzMaker.com
3386 Load: dtoverlay=piscreen,<param>=<val>
3387 Params: speed Display SPI bus speed
3389 rotate Display rotation {0,90,180,270}
3391 fps Delay between frame updates
3393 debug Debug output level {0-7}
3395 xohms Touchpanel sensitivity (X-plate resistance)
3397 drm Select the DRM/KMS driver instead of the FBTFT
3402 Info: PiScreen 2 with resistive TP display by OzzMaker.com
3403 Load: dtoverlay=piscreen2r,<param>=<val>
3404 Params: speed Display SPI bus speed
3406 rotate Display rotation {0,90,180,270}
3408 fps Delay between frame updates
3410 debug Debug output level {0-7}
3412 xohms Touchpanel sensitivity (X-plate resistance)
3416 Info: Configures the Blokas Labs pisound card
3417 Load: dtoverlay=pisound
3422 Info: Adafruit PiTFT 2.2" screen
3423 Load: dtoverlay=pitft22,<param>=<val>
3424 Params: speed Display SPI bus speed
3426 rotate Display rotation {0,90,180,270}
3428 fps Delay between frame updates
3430 debug Debug output level {0-7}
3433 Name: pitft28-capacitive
3434 Info: Adafruit PiTFT 2.8" capacitive touch screen
3435 Load: dtoverlay=pitft28-capacitive,<param>=<val>
3436 Params: speed Display SPI bus speed
3438 rotate Display rotation {0,90,180,270}
3440 fps Delay between frame updates
3442 debug Debug output level {0-7}
3444 touch-sizex Touchscreen size x (default 240)
3446 touch-sizey Touchscreen size y (default 320)
3448 touch-invx Touchscreen inverted x axis
3450 touch-invy Touchscreen inverted y axis
3452 touch-swapxy Touchscreen swapped x y axis
3455 Name: pitft28-resistive
3456 Info: Adafruit PiTFT 2.8" resistive touch screen
3457 Load: dtoverlay=pitft28-resistive,<param>=<val>
3458 Params: speed Display SPI bus speed
3460 rotate Display rotation {0,90,180,270}
3462 fps Delay between frame updates
3464 debug Debug output level {0-7}
3466 drm Force the use of the mi0283qt DRM driver (by
3467 default the ili9340 framebuffer driver will
3468 be used in preference if available)
3471 Name: pitft35-resistive
3472 Info: Adafruit PiTFT 3.5" resistive touch screen
3473 Load: dtoverlay=pitft35-resistive,<param>=<val>
3474 Params: speed Display SPI bus speed
3476 rotate Display rotation {0,90,180,270}
3478 fps Delay between frame updates
3480 debug Debug output level {0-7}
3482 drm Force the use of the hx8357d DRM driver (by
3483 default the fb_hx8357d framebuffer driver will
3484 be used in preference if available)
3488 Info: Configures the pps-gpio (pulse-per-second time signal via GPIO).
3489 Load: dtoverlay=pps-gpio,<param>=<val>
3490 Params: gpiopin Input GPIO (default "18")
3491 assert_falling_edge When present, assert is indicated by a falling
3492 edge, rather than by a rising edge (default
3494 capture_clear Generate clear events on the trailing edge
3496 pull Desired pull-up/down state (off, down, up)
3501 Info: Configures the PROTO Audio Codec card
3502 Load: dtoverlay=proto-codec
3507 Info: Configures a single PWM channel
3508 Legal pin,function combinations for each channel:
3509 PWM0: 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
3510 PWM1: 13,4(Alt0) 19,2(Alt5) 41,4(Alt0) 45,4(Alt0) 53,5(Alt1)
3512 1) Pin 18 is the only one available on all platforms, and
3513 it is the one used by the I2S audio interface.
3514 Pins 12 and 13 might be better choices on an A+, B+ or Pi2.
3515 2) The onboard analogue audio output uses both PWM channels.
3516 3) So be careful mixing audio and PWM.
3517 4) Currently the clock must have been enabled and configured
3519 Load: dtoverlay=pwm,<param>=<val>
3520 Params: pin Output pin (default 18) - see table
3521 func Pin function (default 2 = Alt5) - see above
3522 clock PWM clock frequency (informational)
3526 Info: Configures both PWM channels
3527 Legal pin,function combinations for each channel:
3528 PWM0: 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
3529 PWM1: 13,4(Alt0) 19,2(Alt5) 41,4(Alt0) 45,4(Alt0) 53,5(Alt1)
3531 1) Pin 18 is the only one available on all platforms, and
3532 it is the one used by the I2S audio interface.
3533 Pins 12 and 13 might be better choices on an A+, B+ or Pi2.
3534 2) The onboard analogue audio output uses both PWM channels.
3535 3) So be careful mixing audio and PWM.
3536 4) Currently the clock must have been enabled and configured
3538 Load: dtoverlay=pwm-2chan,<param>=<val>
3539 Params: pin Output pin (default 18) - see table
3540 pin2 Output pin for other channel (default 19)
3541 func Pin function (default 2 = Alt5) - see above
3542 func2 Function for pin2 (default 2 = Alt5)
3543 clock PWM clock frequency (informational)
3547 Info: Use GPIO pin as pwm-assisted infrared transmitter output.
3548 This is an alternative to "gpio-ir-tx". pwm-ir-tx makes use
3549 of PWM0 to reduce the CPU load during transmission compared to
3550 gpio-ir-tx which uses bit-banging.
3551 Legal pin,function combinations are:
3552 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
3553 Load: dtoverlay=pwm-ir-tx,<param>=<val>
3554 Params: gpio_pin Output GPIO (default 18)
3556 func Pin function (default 2 = Alt5)
3560 Info: Configures one or two PWM channel on PWM1 (BCM2711 only)
3562 1) The onboard analogue audio output uses both PWM channels.
3563 2) So be careful mixing audio and PWM.
3564 Note that even when only one pin is enabled, both channels are available
3565 from the PWM driver, so be careful to use the correct one.
3566 Load: dtoverlay=pwm1,<param>=<val>
3567 Params: clock PWM clock frequency (informational)
3568 pins_40 Enable channel 0 (PWM1_0) on GPIO 40
3569 pins_41 Enable channel 1 (PWM1_1) on GPIO 41
3570 pins_40_41 Enable channels 0 (PWM1_0) and 1 (PW1_1) on
3571 GPIOs 40 and 41 (default)
3572 pull_up Enable pull-ups on the PWM pins (default)
3573 pull_down Enable pull-downs on the PWM pins
3574 pull_off Disable pulls on the PWM pins
3578 Info: in-tech's Evaluation Board for PLC Stamp micro
3579 This uses spi0 and a separate GPIO interrupt to connect the QCA7000.
3580 Load: dtoverlay=qca7000,<param>=<val>
3581 Params: int_pin GPIO pin for interrupt signal (default 23)
3583 speed SPI bus speed (default 12 MHz)
3587 Info: in-tech's Evaluation Board for PLC Stamp micro (UART)
3588 This uses uart0/ttyAMA0 over GPIOs 14 & 15 to connect the QCA7000.
3589 But it requires disabling of onboard Bluetooth on
3590 Pi 3B, 3B+, 3A+, 4B and Zero W.
3591 Load: dtoverlay=qca7000-uart0,<param>=<val>
3592 Params: baudrate Set the baudrate for the UART (default
3597 Info: Enable the preservation of crash logs across a reboot. With
3598 systemd-pstore enabled (as it is on Raspberry Pi OS) the crash logs
3599 are moved to /var/lib/systemd/pstore/ on reboot.
3600 Load: dtoverlay=ramoops,<param>=<val>
3601 Params: base-addr Where to place the capture buffer (default
3603 total-size How much memory to allocate altogether (in
3604 bytes - default 64kB)
3605 record-size How much space to use for each capture, i.e.
3606 total-size / record-size = number of captures
3608 console-size Size of non-panic dmesg captures (default 0)
3612 Info: The version of the ramoops overlay for the Pi 4 family. It should be
3613 loaded automatically if dtoverlay=ramoops is specified on a Pi 4.
3614 Load: dtoverlay=ramoops-pi4,<param>=<val>
3615 Params: base-addr Where to place the capture buffer (default
3617 total-size How much memory to allocate altogether (in
3618 bytes - default 64kB)
3619 record-size How much space to use for each capture, i.e.
3620 total-size / record-size = number of captures
3622 console-size Size of non-panic dmesg captures (default 0)
3625 Name: rotary-encoder
3626 Info: Overlay for GPIO connected rotary encoder.
3627 Load: dtoverlay=rotary-encoder,<param>=<val>
3628 Params: pin_a GPIO connected to rotary encoder channel A
3630 pin_b GPIO connected to rotary encoder channel B
3632 relative_axis register a relative axis rather than an
3633 absolute one. Relative axis will only
3634 generate +1/-1 events on the input device,
3635 hence no steps need to be passed.
3636 linux_axis the input subsystem axis to map to this
3637 rotary encoder. Defaults to 0 (ABS_X / REL_X)
3638 rollover Automatic rollover when the rotary value
3639 becomes greater than the specified steps or
3640 smaller than 0. For absolute axis only.
3641 steps-per-period Number of steps (stable states) per period.
3642 The values have the following meaning:
3643 1: Full-period mode (default)
3645 4: Quarter-period mode
3646 steps Number of steps in a full turnaround of the
3647 encoder. Only relevant for absolute axis.
3648 Defaults to 24 which is a typical value for
3650 wakeup Boolean, rotary encoder can wake up the
3652 encoding String, the method used to encode steps.
3653 Supported are "gray" (the default and more
3654 common) and "binary".
3658 Info: Raspberry Pi official display backlight driver
3659 Load: dtoverlay=rpi-backlight
3663 Name: rpi-cirrus-wm5102
3664 Info: This overlay has been renamed to cirrus-wm5102
3669 Info: Configures the Raspberry Pi Codec Zero sound card
3670 Load: dtoverlay=rpi-codeczero
3675 Info: This overlay has been renamed to i2s-dac.
3680 Info: Configures the Raspberry Pi DAC+ card
3681 Load: dtoverlay=rpi-dacplus,<param>=<val>
3682 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
3683 digital volume control. Enable by adding
3684 "dtparam=24db_digital_gain" to config.txt
3685 before any "dtoverlay" lines.
3686 The default behaviour is that the digital
3687 volume control is limited to a maximum of
3688 0dB. ie. it can attenuate but not provide
3689 gain. For most users, this will be desired
3690 as it will prevent clipping. By appending
3691 the 24db_digital_gain parameter, the digital
3692 volume control will allow up to 24dB of
3693 gain. If this parameter is enabled, it is the
3694 responsibility of the user to ensure that
3695 the digital volume control is set to a value
3696 that does not result in clipping/distortion!
3700 Info: Configures the Raspberry Pi DAC Pro sound card
3701 Load: dtoverlay=rpi-dacpro,<param>=<val>
3702 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
3703 digital volume control. Enable by adding
3704 "dtparam=24db_digital_gain" to config.txt
3705 before any "dtoverlay" lines.
3706 The default behaviour is that the digital
3707 volume control is limited to a maximum of
3708 0dB. ie. it can attenuate but not provide
3709 gain. For most users, this will be desired
3710 as it will prevent clipping. By appending
3711 the 24db_digital_gain parameter, the digital
3712 volume control will allow up to 24dB of
3713 gain. If this parameter is enabled, it is the
3714 responsibility of the user to ensure that
3715 the digital volume control is set to a value
3716 that does not result in clipping/distortion!
3719 Name: rpi-digiampplus
3720 Info: Configures the Raspberry Pi DigiAMP+ sound card
3721 Load: dtoverlay=rpi-digiampplus,<param>=<val>
3722 Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
3723 digital volume control. Enable by adding
3724 "dtparam=24db_digital_gain" to config.txt
3725 before any "dtoverlay" lines.
3726 The default behaviour is that the digital
3727 volume control is limited to a maximum of
3728 0dB. ie. it can attenuate but not provide
3729 gain. For most users, this will be desired
3730 as it will prevent clipping. By appending
3731 the 24db_digital_gain parameter, the digital
3732 volume control will allow up to 24dB of
3733 gain. If this parameter is enabled, it is the
3734 responsibility of the user to ensure that
3735 the digital volume control is set to a value
3736 that does not result in clipping/distortion!
3737 auto_mute_amp If specified, unmute/mute the DigiAMP+ when
3738 starting/stopping audio playback (default "on").
3739 unmute_amp If specified, unmute the DigiAMP+ amp once when
3740 the DAC driver module loads (default "off").
3744 Info: This overlay has been renamed to watterott-display
3749 Info: Official Raspberry Pi display touchscreen
3750 Load: dtoverlay=rpi-ft5406,<param>=<val>
3751 Params: touchscreen-size-x Touchscreen X resolution (default 800)
3752 touchscreen-size-y Touchscreen Y resolution (default 480);
3753 touchscreen-inverted-x Invert touchscreen X coordinates (default 0);
3754 touchscreen-inverted-y Invert touchscreen Y coordinates (default 0);
3755 touchscreen-swapped-x-y Swap X and Y cordinates (default 0);
3759 Info: Raspberry Pi PoE HAT fan
3760 Load: dtoverlay=rpi-poe,<param>[=<val>]
3761 Params: poe_fan_temp0 Temperature (in millicelcius) at which the fan
3762 turns on (default 40000)
3763 poe_fan_temp0_hyst Temperature delta (in millicelcius) at which
3764 the fan turns off (default 2000)
3765 poe_fan_temp1 Temperature (in millicelcius) at which the fan
3766 speeds up (default 45000)
3767 poe_fan_temp1_hyst Temperature delta (in millicelcius) at which
3768 the fan slows down (default 2000)
3769 poe_fan_temp2 Temperature (in millicelcius) at which the fan
3770 speeds up (default 50000)
3771 poe_fan_temp2_hyst Temperature delta (in millicelcius) at which
3772 the fan slows down (default 2000)
3773 poe_fan_temp3 Temperature (in millicelcius) at which the fan
3774 speeds up (default 55000)
3775 poe_fan_temp3_hyst Temperature delta (in millicelcius) at which
3776 the fan slows down (default 5000)
3777 i2c Control the fan via Linux I2C drivers instead of
3782 Info: Raspberry Pi PoE+ HAT fan
3783 Load: dtoverlay=rpi-poe-plus,<param>[=<val>]
3784 Params: poe_fan_temp0 Temperature (in millicelcius) at which the fan
3785 turns on (default 40000)
3786 poe_fan_temp0_hyst Temperature delta (in millicelcius) at which
3787 the fan turns off (default 2000)
3788 poe_fan_temp1 Temperature (in millicelcius) at which the fan
3789 speeds up (default 45000)
3790 poe_fan_temp1_hyst Temperature delta (in millicelcius) at which
3791 the fan slows down (default 2000)
3792 poe_fan_temp2 Temperature (in millicelcius) at which the fan
3793 speeds up (default 50000)
3794 poe_fan_temp2_hyst Temperature delta (in millicelcius) at which
3795 the fan slows down (default 2000)
3796 poe_fan_temp3 Temperature (in millicelcius) at which the fan
3797 speeds up (default 55000)
3798 poe_fan_temp3_hyst Temperature delta (in millicelcius) at which
3799 the fan slows down (default 5000)
3800 i2c Control the fan via Linux I2C drivers instead of
3805 Info: This overlay has been renamed to proto-codec.
3810 Info: Raspberry Pi Sense HAT
3811 Load: dtoverlay=rpi-sense
3816 Info: Raspberry Pi Sense HAT v2
3817 Load: dtoverlay=rpi-sense-v2
3822 Info: Raspberry Pi TV HAT
3823 Load: dtoverlay=rpi-tv
3828 Info: This overlay has been deprecated and deleted as the V4L2 stateless
3829 video decoder driver is enabled by default.
3833 Name: rra-digidac1-wm8741-audio
3834 Info: Configures the Red Rocks Audio DigiDAC1 soundcard
3835 Load: dtoverlay=rra-digidac1-wm8741-audio
3840 Info: Overlay for the SPI-connected Sainsmart 1.8" display (based on the
3842 Load: dtoverlay=sainsmart18,<param>=<val>
3843 Params: rotate Display rotation {0,90,180,270}
3844 speed SPI bus speed in Hz (default 4000000)
3845 fps Display frame rate in Hz
3846 bgr Enable BGR mode (default off)
3847 debug Debug output level {0-7}
3848 dc_pin GPIO pin for D/C (default 24)
3849 reset_pin GPIO pin for RESET (default 25)
3853 Info: Overlay for the NXP SC16IS750 UART with I2C Interface
3854 Enables the chip on I2C1 at 0x48 (or the "addr" parameter value). To
3855 select another address, please refer to table 10 in reference manual.
3856 Load: dtoverlay=sc16is750-i2c,<param>=<val>
3857 Params: int_pin GPIO used for IRQ (default 24)
3858 addr Address (default 0x48)
3859 xtal On-board crystal frequency (default 14745600)
3863 Info: Overlay for the NXP SC16IS752 dual UART with I2C Interface
3864 Enables the chip on I2C1 at 0x48 (or the "addr" parameter value). To
3865 select another address, please refer to table 10 in reference manual.
3866 Load: dtoverlay=sc16is752-i2c,<param>=<val>
3867 Params: int_pin GPIO used for IRQ (default 24)
3868 addr Address (default 0x48)
3869 xtal On-board crystal frequency (default 14745600)
3872 Name: sc16is752-spi0
3873 Info: Overlay for the NXP SC16IS752 Dual UART with SPI Interface
3874 Enables the chip on SPI0.
3875 Load: dtoverlay=sc16is752-spi0,<param>=<val>
3876 Params: int_pin GPIO used for IRQ (default 24)
3877 xtal On-board crystal frequency (default 14745600)
3880 Name: sc16is752-spi1
3881 Info: Overlay for the NXP SC16IS752 Dual UART with SPI Interface
3882 Enables the chip on SPI1.
3883 N.B.: spi1 is only accessible on devices with a 40pin header, eg:
3884 A+, B+, Zero and PI2 B; as well as the Compute Module.
3886 Load: dtoverlay=sc16is752-spi1,<param>=<val>
3887 Params: int_pin GPIO used for IRQ (default 24)
3888 xtal On-board crystal frequency (default 14745600)
3892 Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock.
3893 N.B. This overlay is designed for situations where the mmc driver is
3894 the default, so it disables the other (mmc) interface - this will kill
3895 WLAN on a Pi3. If this isn't what you want, either use the sdtweak
3896 overlay or the new sd_* dtparams of the base DTBs.
3897 Load: dtoverlay=sdhost,<param>=<val>
3898 Params: overclock_50 Clock (in MHz) to use when the MMC framework
3901 force_pio Disable DMA support (default off)
3903 pio_limit Number of blocks above which to use DMA
3906 debug Enable debug output (default off)
3910 Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,
3911 and enables SDIO via GPIOs 22-27. An example of use in 1-bit mode is
3912 "dtoverlay=sdio,bus_width=1,gpios_22_25"
3913 Load: dtoverlay=sdio,<param>=<val>
3914 Params: sdio_overclock SDIO Clock (in MHz) to use when the MMC
3915 framework requests 50MHz
3917 poll_once Disable SDIO-device polling every second
3918 (default on: polling once at boot-time)
3920 bus_width Set the SDIO host bus width (default 4 bits)
3922 gpios_22_25 Select GPIOs 22-25 for 1-bit mode. Must be used
3923 with bus_width=1. This replaces the sdio-1bit
3924 overlay, which is now deprecated.
3926 gpios_34_37 Select GPIOs 34-37 for 1-bit mode. Must be used
3929 gpios_34_39 Select GPIOs 34-39 for 4-bit mode. Must be used
3930 with bus_width=4 (the default).
3934 Info: This overlay is now deprecated. Use
3935 "dtoverlay=sdio,bus_width=1,gpios_22_25" instead.
3940 Info: Selects the rp1_mmc0 interface and enables it on GPIOs 22-27.
3942 Load: dtoverlay=sdio-pi5
3947 Info: This overlay is now deprecated. Use the sd_* dtparams in the
3948 base DTB, e.g. "dtoverlay=sdtweak,poll_once" becomes
3949 "dtparam=sd_poll_once".
3953 Name: seeed-can-fd-hat-v1
3954 Info: Overlay for Seeed Studio CAN BUS FD HAT with two CAN FD
3955 channels without RTC. Use this overlay if your HAT has no
3957 https://www.seeedstudio.com/2-Channel-CAN-BUS-FD-Shield-for-Raspberry-Pi-p-4072.html
3958 Load: dtoverlay=seeed-can-fd-hat-v1
3962 Name: seeed-can-fd-hat-v2
3963 Info: Overlay for Seeed Studio CAN BUS FD HAT with two CAN FD
3964 channels and an RTC. Use this overlay if your HAT has a
3966 https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html
3967 Load: dtoverlay=seeed-can-fd-hat-v2
3972 Info: Overlay for SH1106 OLED via SPI using fbtft staging driver.
3973 Load: dtoverlay=sh1106-spi,<param>=<val>
3974 Params: speed SPI bus speed (default 4000000)
3975 rotate Display rotation (0, 90, 180 or 270; default 0)
3976 fps Delay between frame updates (default 25)
3977 debug Debug output level (0-7; default 0)
3978 dc_pin GPIO pin for D/C (default 24)
3979 reset_pin GPIO pin for RESET (default 25)
3980 height Display height (32 or 64; default 64)
3984 Info: Overlay for Si446x UHF Transceiver via SPI using si446x driver.
3985 The driver is currently out-of-tree at
3986 https://github.com/sunipkmukherjee/silabs.git
3987 Load: dtoverlay=si446x-spi0,<param>=<val>
3988 Params: speed SPI bus speed (default 4000000)
3989 int_pin GPIO pin for interrupts (default 17)
3990 reset_pin GPIO pin for RESET (default 27)
3994 Info: Enables the Secondary Memory Interface peripheral. Uses GPIOs 2-25!
4000 Info: Enables the userspace interface for the SMI driver
4001 Load: dtoverlay=smi-dev
4006 Info: Enables access to NAND flash via the SMI interface
4007 Load: dtoverlay=smi-nand
4012 Info: Move SPI function block to GPIO 35 to 39
4013 Load: dtoverlay=spi-gpio35-39
4018 Info: Move SPI function block to GPIOs 40 to 45
4019 Load: dtoverlay=spi-gpio40-45
4024 Info: Adds support for a number of SPI Real Time Clock devices
4025 Load: dtoverlay=spi-rtc,<param>=<val>
4026 Params: ds3232 Select the DS3232 device
4027 ds3234 Select the DS3234 device
4028 pcf2123 Select the PCF2123 device
4030 spi0_0 Use spi0.0 (default)
4036 cs_high This device requires an active-high CS
4040 Info: Don't claim any CS pins for SPI0. Requires a device with its chip
4041 select permanently enabled, but frees a GPIO for e.g. a DPI display.
4042 Load: dtoverlay=spi0-0cs,<param>=<val>
4043 Params: no_miso Don't claim and use the MISO pin (9), freeing
4048 Info: Only use one CS pin for SPI0
4049 Load: dtoverlay=spi0-1cs,<param>=<val>
4050 Params: cs0_pin GPIO pin for CS0 (default 8)
4051 no_miso Don't claim and use the MISO pin (9), freeing
4056 Info: Change the CS pins for SPI0
4057 Load: dtoverlay=spi0-2cs,<param>=<val>
4058 Params: cs0_pin GPIO pin for CS0 (default 8)
4059 cs1_pin GPIO pin for CS1 (default 7)
4060 no_miso Don't claim and use the MISO pin (9), freeing
4065 Info: This overlay has been renamed spi0-2cs, keeping spi0-cs as an
4066 alias for backwards compatibility.
4071 Info: This overlay has been deprecated and removed because it is no longer
4072 necessary and has been seen to prevent spi0 from working.
4077 Info: Enables spi1 with a single chip select (CS) line and associated spidev
4078 dev node. The gpio pin number for the CS line and spidev device node
4079 creation are configurable.
4080 N.B.: spi1 is not accessible on old Pis without a 40-pin header.
4081 Load: dtoverlay=spi1-1cs,<param>=<val>
4082 Params: cs0_pin GPIO pin for CS0 (default 18 - BCM SPI1_CE0).
4083 cs0_spidev Set to 'off' to stop the creation of a
4084 userspace device node /dev/spidev1.0 (default
4085 is 'on' or enabled).
4089 Info: Enables spi1 with two chip select (CS) lines and associated spidev
4090 dev nodes. The gpio pin numbers for the CS lines and spidev device node
4091 creation are configurable.
4092 N.B.: spi1 is not accessible on old Pis without a 40-pin header.
4093 Load: dtoverlay=spi1-2cs,<param>=<val>
4094 Params: cs0_pin GPIO pin for CS0 (default 18 - BCM SPI1_CE0).
4095 cs1_pin GPIO pin for CS1 (default 17 - BCM SPI1_CE1).
4096 cs0_spidev Set to 'off' to stop the creation of a
4097 userspace device node /dev/spidev1.0 (default
4098 is 'on' or enabled).
4099 cs1_spidev Set to 'off' to stop the creation of a
4100 userspace device node /dev/spidev1.1 (default
4101 is 'on' or enabled).
4105 Info: Enables spi1 with three chip select (CS) lines and associated spidev
4106 dev nodes. The gpio pin numbers for the CS lines and spidev device node
4107 creation are configurable.
4108 N.B.: spi1 is not accessible on old Pis without a 40-pin header.
4109 Load: dtoverlay=spi1-3cs,<param>=<val>
4110 Params: cs0_pin GPIO pin for CS0 (default 18 - BCM SPI1_CE0).
4111 cs1_pin GPIO pin for CS1 (default 17 - BCM SPI1_CE1).
4112 cs2_pin GPIO pin for CS2 (default 16 - BCM SPI1_CE2).
4113 cs0_spidev Set to 'off' to stop the creation of a
4114 userspace device node /dev/spidev1.0 (default
4115 is 'on' or enabled).
4116 cs1_spidev Set to 'off' to stop the creation of a
4117 userspace device node /dev/spidev1.1 (default
4118 is 'on' or enabled).
4119 cs2_spidev Set to 'off' to stop the creation of a
4120 userspace device node /dev/spidev1.2 (default
4121 is 'on' or enabled).
4125 Info: Enables spi2 on GPIOs 40-42 with a single chip select (CS) line and
4126 associated spidev dev node. The gpio pin number for the CS line and
4127 spidev device node creation are configurable. spi2-2cs-pi5 is
4128 substituted on a Pi 5.
4129 N.B.: spi2 is only accessible with the Compute Module or Pi 5.
4130 Load: dtoverlay=spi2-1cs,<param>=<val>
4131 Params: cs0_pin GPIO pin for CS0 (default 43 - BCM SPI2_CE0).
4132 cs0_spidev Set to 'off' to stop the creation of a
4133 userspace device node /dev/spidev2.0 (default
4134 is 'on' or enabled).
4138 Info: Enables spi2 on GPIOs 1-3 with a single chip select (CS) line and
4139 associated spidev dev node. The gpio pin number for the CS line and
4140 spidev device node creation are configurable. Pi 5 only.
4141 Load: dtoverlay=spi2-1cs-pi5,<param>=<val>
4142 Params: cs0_pin GPIO pin for CS0 (default 0).
4143 cs0_spidev Set to 'off' to stop the creation of a
4144 userspace device node /dev/spidev2.0 (default
4145 is 'on' or enabled).
4149 Info: Enables spi2 on GPIOs 40-42 with two chip select (CS) lines and
4150 associated spidev dev nodes. The gpio pin numbers for the CS lines and
4151 spidev device node creation are configurable. spi2-2cs-pi5 is
4152 substituted on a Pi 5.
4153 N.B.: spi2 is only accessible with the Compute Module or Pi 5.
4154 Load: dtoverlay=spi2-2cs,<param>=<val>
4155 Params: cs0_pin GPIO pin for CS0 (default 43 - BCM SPI2_CE0).
4156 cs1_pin GPIO pin for CS1 (default 44 - BCM SPI2_CE1).
4157 cs0_spidev Set to 'off' to stop the creation of a
4158 userspace device node /dev/spidev2.0 (default
4159 is 'on' or enabled).
4160 cs1_spidev Set to 'off' to stop the creation of a
4161 userspace device node /dev/spidev2.1 (default
4162 is 'on' or enabled).
4166 Info: Enables spi2 on GPIOs 1-3 with two chip select (CS) lines and
4167 associated spidev dev nodes. The gpio pin numbers for the CS lines and
4168 spidev device node creation are configurable. Pi 5 only.
4169 Load: dtoverlay=spi2-2cs-pi5,<param>=<val>
4170 Params: cs0_pin GPIO pin for CS0 (default 0).
4171 cs1_pin GPIO pin for CS1 (default 24).
4172 cs0_spidev Set to 'off' to stop the creation of a
4173 userspace device node /dev/spidev2.0 (default
4174 is 'on' or enabled).
4175 cs1_spidev Set to 'off' to stop the creation of a
4176 userspace device node /dev/spidev2.1 (default
4177 is 'on' or enabled).
4181 Info: Enables spi2 on GPIOs 40-42 with three chip select (CS) lines and
4182 associated spidev dev nodes. The gpio pin numbers for the CS lines and
4183 spidev device node creation are configurable.
4184 N.B.: spi2 is only accessible with the Compute Module or Pi 5.
4185 Load: dtoverlay=spi2-3cs,<param>=<val>
4186 Params: cs0_pin GPIO pin for CS0 (default 43 - BCM SPI2_CE0).
4187 cs1_pin GPIO pin for CS1 (default 44 - BCM SPI2_CE1).
4188 cs2_pin GPIO pin for CS2 (default 45 - BCM SPI2_CE2).
4189 cs0_spidev Set to 'off' to stop the creation of a
4190 userspace device node /dev/spidev2.0 (default
4191 is 'on' or enabled).
4192 cs1_spidev Set to 'off' to stop the creation of a
4193 userspace device node /dev/spidev2.1 (default
4194 is 'on' or enabled).
4195 cs2_spidev Set to 'off' to stop the creation of a
4196 userspace device node /dev/spidev2.2 (default
4197 is 'on' or enabled).
4201 Info: Enables spi3 on GPIOs 1-3 with a single chip select (CS) line and
4202 associated spidev dev node. The gpio pin number for the CS line and
4203 spidev device node creation are configurable. BCM2711 only,
4204 spi3-1cs-pi5 is substituted on Pi 5.
4205 Load: dtoverlay=spi3-1cs,<param>=<val>
4206 Params: cs0_pin GPIO pin for CS0 (default 0 - BCM SPI3_CE0).
4207 cs0_spidev Set to 'off' to prevent the creation of a
4208 userspace device node /dev/spidev3.0 (default
4209 is 'on' or enabled).
4213 Info: Enables spi3 on GPIOs 5-7 with a single chip select (CS) line and
4214 associated spidev dev node. The gpio pin number for the CS line and
4215 spidev device node creation are configurable. Pi 5 only.
4216 Load: dtoverlay=spi3-1cs-pi5,<param>=<val>
4217 Params: cs0_pin GPIO pin for CS0 (default 4).
4218 cs0_spidev Set to 'off' to prevent the creation of a
4219 userspace device node /dev/spidev3.0 (default
4220 is 'on' or enabled).
4224 Info: Enables spi3 on GPIO2 1-3 with two chip select (CS) lines and
4225 associated spidev dev nodes. The gpio pin numbers for the CS lines and
4226 spidev device node creation are configurable. BCM2711 only,
4227 spi3-2cs-pi5 is substituted on Pi 5.
4228 Load: dtoverlay=spi3-2cs,<param>=<val>
4229 Params: cs0_pin GPIO pin for CS0 (default 0 - BCM SPI3_CE0).
4230 cs1_pin GPIO pin for CS1 (default 24 - BCM SPI3_CE1).
4231 cs0_spidev Set to 'off' to prevent the creation of a
4232 userspace device node /dev/spidev3.0 (default
4233 is 'on' or enabled).
4234 cs1_spidev Set to 'off' to prevent the creation of a
4235 userspace device node /dev/spidev3.1 (default
4236 is 'on' or enabled).
4240 Info: Enables spi3 on GPIOs 5-7 with two chip select (CS) lines and
4241 associated spidev dev nodes. The gpio pin numbers for the CS lines and
4242 spidev device node creation are configurable. Pi 5 only.
4243 Load: dtoverlay=spi3-2cs-pi5,<param>=<val>
4244 Params: cs0_pin GPIO pin for CS0 (default 4).
4245 cs1_pin GPIO pin for CS1 (default 25).
4246 cs0_spidev Set to 'off' to prevent the creation of a
4247 userspace device node /dev/spidev3.0 (default
4248 is 'on' or enabled).
4249 cs1_spidev Set to 'off' to prevent the creation of a
4250 userspace device node /dev/spidev3.1 (default
4251 is 'on' or enabled).
4255 Info: Enables spi4 on GPIOs 5-7 with a single chip select (CS) line and
4256 associated spidev dev node. The gpio pin number for the CS line and
4257 spidev device node creation are configurable. BCM2711 only.
4258 Load: dtoverlay=spi4-1cs,<param>=<val>
4259 Params: cs0_pin GPIO pin for CS0 (default 4 - BCM SPI4_CE0).
4260 cs0_spidev Set to 'off' to prevent the creation of a
4261 userspace device node /dev/spidev4.0 (default
4262 is 'on' or enabled).
4266 Info: Enables spi4 on GPIOs 5-6 with two chip select (CS) lines and
4267 associated spidev dev nodes. The gpio pin numbers for the CS lines and
4268 spidev device node creation are configurable. BCM2711 only.
4269 Load: dtoverlay=spi4-2cs,<param>=<val>
4270 Params: cs0_pin GPIO pin for CS0 (default 4 - BCM SPI4_CE0).
4271 cs1_pin GPIO pin for CS1 (default 25 - BCM SPI4_CE1).
4272 cs0_spidev Set to 'off' to prevent the creation of a
4273 userspace device node /dev/spidev4.0 (default
4274 is 'on' or enabled).
4275 cs1_spidev Set to 'off' to prevent the creation of a
4276 userspace device node /dev/spidev4.1 (default
4277 is 'on' or enabled).
4281 Info: Enables spi5 on GPIOs 13-15 with a single chip select (CS) line and
4282 associated spidev dev node. The gpio pin numbers for the CS lines and
4283 spidev device node creation are configurable. BCM2711 and Pi 5.
4284 Load: dtoverlay=spi5-1cs,<param>=<val>
4285 Params: cs0_pin GPIO pin for CS0 (default 12).
4286 cs0_spidev Set to 'off' to prevent the creation of a
4287 userspace device node /dev/spidev5.0 (default
4288 is 'on' or enabled).
4296 Info: Enables spi5 on GPIOs 13-15 with two chip select (CS) lines and
4297 associated spidev dev nodes. The gpio pin numbers for the CS lines and
4298 spidev device node creation are configurable. BCM2711 and Pi 5.
4299 Load: dtoverlay=spi5-2cs,<param>=<val>
4300 Params: cs0_pin GPIO pin for CS0 (default 12).
4301 cs1_pin GPIO pin for CS1 (default 26).
4302 cs0_spidev Set to 'off' to prevent the creation of a
4303 userspace device node /dev/spidev5.0 (default
4304 is 'on' or enabled).
4305 cs1_spidev Set to 'off' to prevent the creation of a
4306 userspace device node /dev/spidev5.1 (default
4307 is 'on' or enabled).
4315 Info: Enables spi6 with a single chip select (CS) line and associated spidev
4316 dev node. The gpio pin number for the CS line and spidev device node
4317 creation are configurable. BCM2711 only.
4318 Load: dtoverlay=spi6-1cs,<param>=<val>
4319 Params: cs0_pin GPIO pin for CS0 (default 18 - BCM SPI6_CE0).
4320 cs0_spidev Set to 'off' to prevent the creation of a
4321 userspace device node /dev/spidev6.0 (default
4322 is 'on' or enabled).
4326 Info: Enables spi6 with two chip select (CS) lines and associated spidev
4327 dev nodes. The gpio pin numbers for the CS lines and spidev device node
4328 creation are configurable. BCM2711 only.
4329 Load: dtoverlay=spi6-2cs,<param>=<val>
4330 Params: cs0_pin GPIO pin for CS0 (default 18 - BCM SPI6_CE0).
4331 cs1_pin GPIO pin for CS1 (default 27 - BCM SPI6_CE1).
4332 cs0_spidev Set to 'off' to prevent the creation of a
4333 userspace device node /dev/spidev6.0 (default
4334 is 'on' or enabled).
4335 cs1_spidev Set to 'off' to prevent the creation of a
4336 userspace device node /dev/spidev6.1 (default
4337 is 'on' or enabled).
4341 Info: Overlay for activation of SSD1306 over I2C OLED display framebuffer.
4342 Load: dtoverlay=ssd1306,<param>=<val>
4343 Params: address Location in display memory of first character.
4345 width Width of display. (default=128)
4346 height Height of display. (default=64)
4347 offset virtual channel a. (default=0)
4348 normal Has no effect on displays tested. (default=not
4350 sequential Set this if every other scan line is missing.
4352 remapped Set this if display is garbled. (default=not
4354 inverted Set this if display is inverted and mirrored.
4358 Typical usage for 128x64 display: dtoverlay=ssd1306,inverted
4360 Typical usage for 128x32 display: dtoverlay=ssd1306,inverted,sequential
4362 i2c_baudrate=400000 will speed up the display.
4364 i2c_baudrate=1000000 seems to work even though it's not officially
4365 supported by the hardware, and is faster still.
4367 For more information refer to the device datasheet at:
4368 https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
4372 Info: Overlay for SSD1306 OLED via SPI using fbtft staging driver.
4373 Load: dtoverlay=ssd1306-spi,<param>=<val>
4374 Params: speed SPI bus speed (default 10000000)
4375 rotate Display rotation (0, 90, 180 or 270; default 0)
4376 fps Delay between frame updates (default 25)
4377 debug Debug output level (0-7; default 0)
4378 dc_pin GPIO pin for D/C (default 24)
4379 reset_pin GPIO pin for RESET (default 25)
4380 height Display height (32 or 64; default 64)
4381 inverted Set this if display is inverted and mirrored.
4386 Info: Overlay for SSD1331 OLED via SPI using fbtft staging driver.
4387 Load: dtoverlay=ssd1331-spi,<param>=<val>
4388 Params: speed SPI bus speed (default 4500000)
4389 rotate Display rotation (0, 90, 180 or 270; default 0)
4390 fps Delay between frame updates (default 25)
4391 debug Debug output level (0-7; default 0)
4392 dc_pin GPIO pin for D/C (default 24)
4393 reset_pin GPIO pin for RESET (default 25)
4397 Info: Overlay for SSD1351 OLED via SPI using fbtft staging driver.
4398 Load: dtoverlay=ssd1351-spi,<param>=<val>
4399 Params: speed SPI bus speed (default 4500000)
4400 rotate Display rotation (0, 90, 180 or 270; default 0)
4401 fps Delay between frame updates (default 25)
4402 debug Debug output level (0-7; default 0)
4403 dc_pin GPIO pin for D/C (default 24)
4404 reset_pin GPIO pin for RESET (default 25)
4407 Name: superaudioboard
4408 Info: Configures the SuperAudioBoard sound card
4409 Load: dtoverlay=superaudioboard,<param>=<val>
4410 Params: gpiopin GPIO pin for codec reset
4414 Info: Configures the Semtech SX150X I2C GPIO expanders.
4415 Load: dtoverlay=sx150x,<param>=<val>
4416 Params: sx150<x>-<n>-<m> Enables SX150X device on I2C#<n> with slave
4417 address <m>. <x> may be 1-9. <n> may be 0 or 1.
4418 Permissible values of <m> (which is denoted in
4419 hex) depend on the device variant. For SX1501,
4420 SX1502, SX1504 and SX1505, <m> may be 20 or 21.
4421 For SX1503 and SX1506, <m> may be 20. For
4422 SX1507 and SX1509, <m> may be 3E, 3F, 70 or 71.
4423 For SX1508, <m> may be 20, 21, 22 or 23.
4425 sx150<x>-<n>-<m>-int-gpio
4426 Integer, enables interrupts on SX150X device on
4427 I2C#<n> with slave address <m>, specifies
4428 the GPIO pin to which NINT output of SX150X is
4433 Info: Toshiba TC358743 HDMI to CSI-2 bridge chip.
4434 Uses Unicam 1, which is the standard camera connector on most Pi
4436 Load: dtoverlay=tc358743,<param>=<val>
4437 Params: 4lane Use 4 lanes (only applicable to Compute Modules
4440 link-frequency Set the link frequency. Only values of 297000000
4441 (574Mbit/s) and 486000000 (972Mbit/s - default)
4442 are supported by the driver.
4443 media-controller Configure use of Media Controller API for
4444 configuring the sensor (default off)
4445 cam0 Adopt the default configuration for CAM0 on a
4446 Compute Module (CSI0, i2c_vc, and cam0_reg).
4449 Name: tc358743-audio
4450 Info: Used in combination with the tc358743-fast overlay to route the audio
4451 from the TC358743 over I2S to the Pi.
4452 Wiring is LRCK/WFS to GPIO 19, BCK/SCK to GPIO 18, and DATA/SD to GPIO
4454 Load: dtoverlay=tc358743-audio,<param>=<val>
4455 Params: card-name Override the default, "tc358743", card name.
4459 Info: 3.5" Color TFT Display by www.tinylcd.com
4460 Options: Touch, RTC, keypad
4461 Load: dtoverlay=tinylcd35,<param>=<val>
4462 Params: speed Display SPI bus speed
4464 rotate Display rotation {0,90,180,270}
4466 fps Delay between frame updates
4468 debug Debug output level {0-7}
4470 touch Enable touch panel
4472 touchgpio Touch controller IRQ GPIO
4474 xohms Touchpanel: Resistance of X-plate in ohms
4476 rtc-pcf PCF8563 Real Time Clock
4478 rtc-ds DS1307 Real Time Clock
4480 keypad Enable keypad
4483 Display with touchpanel, PCF8563 RTC and keypad:
4484 dtoverlay=tinylcd35,touch,rtc-pcf,keypad
4486 dtoverlay=tinylcd35,touch,touchgpio=3
4490 Info: Enables support for Infineon SLB9670 Trusted Platform Module add-on
4491 boards, which can be used as a secure key storage and hwrng,
4492 available as "Iridium SLB9670" by Infineon and "LetsTrust TPM" by pi3g.
4493 Load: dtoverlay=tpm-slb9670
4498 Info: Enables support for Infineon SLB9673 Trusted Platform Module add-on
4499 boards, which can be used as a secure key storage and hwrng
4500 via the I2C protocol.
4501 Load: dtoverlay=tpm-slb9673
4506 Info: Change the pin usage of uart0
4507 Load: dtoverlay=uart0,<param>=<val>
4508 Params: txd0_pin GPIO pin for TXD0 (14, 32 or 36 - default 14)
4510 rxd0_pin GPIO pin for RXD0 (15, 33 or 37 - default 15)
4512 pin_func Alternative pin function - 4(Alt0) for 14&15,
4513 7(Alt3) for 32&33, 6(Alt2) for 36&37
4517 Info: Enable uart 0 on GPIOs 14-15. Pi 5 only.
4518 Load: dtoverlay=uart0-pi5,<param>
4519 Params: ctsrts Enable CTS/RTS on GPIOs 16-17 (default off)
4523 Info: Change the pin usage of uart1
4524 Load: dtoverlay=uart1,<param>=<val>
4525 Params: txd1_pin GPIO pin for TXD1 (14, 32 or 40 - default 14)
4527 rxd1_pin GPIO pin for RXD1 (15, 33 or 41 - default 15)
4531 Info: Enable uart 1 on GPIOs 0-1. Pi 5 only.
4532 Load: dtoverlay=uart1-pi5,<param>
4533 Params: ctsrts Enable CTS/RTS on GPIOs 2-3 (default off)
4537 Info: Enable uart 2 on GPIOs 0-3. BCM2711 only.
4538 Load: dtoverlay=uart2,<param>
4539 Params: ctsrts Enable CTS/RTS on GPIOs 2-3 (default off)
4543 Info: Enable uart 2 on GPIOs 4-5. Pi 5 only.
4544 Load: dtoverlay=uart2-pi5,<param>
4545 Params: ctsrts Enable CTS/RTS on GPIOs 6-7 (default off)
4549 Info: Enable uart 3 on GPIOs 4-7. BCM2711 only.
4550 Load: dtoverlay=uart3,<param>
4551 Params: ctsrts Enable CTS/RTS on GPIOs 6-7 (default off)
4555 Info: Enable uart 3 on GPIOs 8-9. Pi 5 only.
4556 Load: dtoverlay=uart3-pi5,<param>
4557 Params: ctsrts Enable CTS/RTS on GPIOs 10-11 (default off)
4561 Info: Enable uart 4 on GPIOs 8-11. BCM2711 only.
4562 Load: dtoverlay=uart4,<param>
4563 Params: ctsrts Enable CTS/RTS on GPIOs 10-11 (default off)
4567 Info: Enable uart 4 on GPIOs 12-13. Pi 5 only.
4568 Load: dtoverlay=uart4-pi5,<param>
4569 Params: ctsrts Enable CTS/RTS on GPIOs 14-15 (default off)
4573 Info: Enable uart 5 on GPIOs 12-15. BCM2711 only.
4574 Load: dtoverlay=uart5,<param>
4575 Params: ctsrts Enable CTS/RTS on GPIOs 14-15 (default off)
4579 Info: Configures the NW Digital Radio UDRC Hat
4580 Load: dtoverlay=udrc,<param>=<val>
4581 Params: alsaname Name of the ALSA audio device (default "udrc")
4584 Name: ugreen-dabboard
4585 Info: Configures the ugreen-dabboard I2S overlay
4586 This is a simple overlay based on the simple-audio-card and the dmic
4587 codec. It has the speciality that it is configured to use the codec
4588 as a master I2S device. It works for example with the Si468x DAB
4589 receiver on the uGreen DABBoard.
4590 Load: dtoverlay=ugreen-dabboard,<param>=<val>
4591 Params: card-name Override the default, "dabboard", card name.
4595 Info: Allow usage of downstream .dtb with upstream kernel. Comprises the
4596 vc4-kms-v3d and dwc2 overlays.
4597 Load: dtoverlay=upstream
4601 Name: upstream-aux-interrupt
4602 Info: This overlay has been deprecated and removed because it is no longer
4608 Info: Allow usage of downstream .dtb with upstream kernel on Pi 4. Comprises
4609 the vc4-kms-v3d-pi4 and dwc2 overlays.
4610 Load: dtoverlay=upstream-pi4
4615 Info: Enable Eric Anholt's DRM VC4 V3D driver on top of the dispmanx
4617 Load: dtoverlay=vc4-fkms-v3d,<param>
4618 Params: cma-512 CMA is 512MB (needs 1GB)
4619 cma-448 CMA is 448MB (needs 1GB)
4620 cma-384 CMA is 384MB (needs 1GB)
4621 cma-320 CMA is 320MB (needs 1GB)
4622 cma-256 CMA is 256MB (needs 1GB)
4623 cma-192 CMA is 192MB (needs 1GB)
4624 cma-128 CMA is 128MB
4627 cma-size CMA size in bytes, 4MB aligned
4628 cma-default Use upstream's default value
4631 Name: vc4-fkms-v3d-pi4
4632 Info: Enable Eric Anholt's DRM VC4 V3D driver on top of the dispmanx
4634 Load: dtoverlay=vc4-fkms-v3d-pi4,<param>
4635 Params: cma-512 CMA is 512MB (needs 1GB)
4636 cma-448 CMA is 448MB (needs 1GB)
4637 cma-384 CMA is 384MB (needs 1GB)
4638 cma-320 CMA is 320MB (needs 1GB)
4639 cma-256 CMA is 256MB (needs 1GB)
4640 cma-192 CMA is 192MB (needs 1GB)
4641 cma-128 CMA is 128MB
4644 cma-size CMA size in bytes, 4MB aligned
4645 cma-default Use upstream's default value
4648 Name: vc4-kms-dpi-at056tn53v1
4649 Info: This overlay is now deprecated - see vc4-kms-dpi-panel,at056tn53v1
4653 Name: vc4-kms-dpi-generic
4654 Info: Enable a generic DPI display under KMS. Default timings are for the
4655 Adafruit Kippah with 800x480 panel and RGB666 (GPIOs 0-21)
4656 Requires vc4-kms-v3d to be loaded.
4657 Load: dtoverlay=vc4-kms-dpi-generic,<param>=<val>
4658 Params: clock-frequency Display clock frequency (Hz)
4659 hactive Horizontal active pixels
4660 hfp Horizontal front porch
4661 hsync Horizontal sync pulse width
4662 hbp Horizontal back porch
4663 vactive Vertical active lines
4664 vfp Vertical front porch
4665 vsync Vertical sync pulse width
4666 vbp Vertical back porch
4667 hsync-invert Horizontal sync active low
4668 vsync-invert Vertical sync active low
4669 de-invert Data Enable active low
4670 pixclk-invert Negative edge pixel clock
4671 width-mm Define the screen width in mm
4672 height-mm Define the screen height in mm
4673 rgb565 Change to RGB565 output on GPIOs 0-19
4674 rgb565-padhi Change to RGB565 output on GPIOs 0-8, 12-17, and
4676 bgr666 Change to BGR666 output on GPIOs 0-21.
4677 bgr666-padhi Change to BGR666 output on GPIOs 0-9, 12-17, and
4679 rgb666-padhi Change to RGB666 output on GPIOs 0-9, 12-17, and
4681 bgr888 Change to BGR888 output on GPIOs 0-27
4682 rgb888 Change to RGB888 output on GPIOs 0-27
4683 bus-format Override the bus format for a MEDIA_BUS_FMT_*
4684 value. NB also overridden by rgbXXX overrides.
4685 backlight-gpio Defines a GPIO to be used for backlight control
4687 backlight-pwm Defines a PWM channel to be used for backlight
4688 control (default of none). NB Disables audio
4689 headphone output as that also uses PWM.
4690 backlight-pwm-chan Choose channel on &pwm node for backlight
4693 backlight-pwm-gpio GPIO pin to be used for the PWM backlight. See
4694 pwm-2chan for valid options.
4695 (default 18 - note this can only work with
4697 backlight-pwm-func Pin function of GPIO used for the PWM
4699 See pwm-2chan for valid options.
4701 backlight-def-brightness
4702 Set the default brightness. Normal range 1-16.
4704 rotate Display rotation {0,90,180,270} (default 0)
4707 Name: vc4-kms-dpi-hyperpixel2r
4708 Info: Enable the KMS drivers for the Pimoroni HyperPixel2 Round DPI display.
4709 Requires vc4-kms-v3d to be loaded.
4710 Load: dtoverlay=vc4-kms-dpi-hyperpixel2r,<param>=<val>
4711 Params: disable-touch Disables the touch controller
4712 touchscreen-inverted-x Inverts X direction of touch controller
4713 touchscreen-inverted-y Inverts Y direction of touch controller
4714 touchscreen-swapped-x-y Swaps X & Y axes of touch controller
4715 rotate Display rotation {0,90,180,270} (default 0)
4718 Name: vc4-kms-dpi-hyperpixel4
4719 Info: Enable the KMS drivers for the Pimoroni HyperPixel4 DPI display.
4720 Requires vc4-kms-v3d to be loaded.
4721 Load: dtoverlay=vc4-kms-dpi-hyperpixel4,<param>=<val>
4722 Params: disable-touch Disables the touch controller
4723 touchscreen-inverted-x Inverts X direction of touch controller
4724 touchscreen-inverted-y Inverts Y direction of touch controller
4725 touchscreen-swapped-x-y Swaps X & Y axes of touch controller
4726 rotate Display rotation {0,90,180,270} (default 0)
4729 Name: vc4-kms-dpi-hyperpixel4sq
4730 Info: Enable the KMS drivers for the Pimoroni HyperPixel4 Square DPI display.
4731 Requires vc4-kms-v3d to be loaded.
4732 Load: dtoverlay=vc4-kms-dpi-hyperpixel4sq,<param>=<val>
4733 Params: disable-touch Disables the touch controller
4734 touchscreen-inverted-x Inverts X direction of touch controller
4735 touchscreen-inverted-y Inverts Y direction of touch controller
4736 touchscreen-swapped-x-y Swaps X & Y axes of touch controller
4737 rotate Display rotation {0,90,180,270} (default 0)
4740 Name: vc4-kms-dpi-panel
4741 Info: Enable a preconfigured KMS DPI panel.
4742 Requires vc4-kms-v3d to be loaded.
4743 Load: dtoverlay=vc4-kms-dpi-panel,<param>=<val>
4744 Params: at056tn53v1 Enable an Innolux 5.6in VGA TFT
4745 kippah-7inch Enable an Adafruit Kippah with 7inch panel.
4746 mzp280 Enable a Geekworm MZP280 panel.
4747 backlight-gpio Defines a GPIO to be used for backlight control
4749 backlight-pwm Defines a PWM channel to be used for backlight
4750 control (default of none). NB Disables audio
4751 headphone output as that also uses PWM.
4752 backlight-pwm-chan Choose channel on &pwm node for backlight
4755 backlight-pwm-gpio GPIO pin to be used for the PWM backlight. See
4756 pwm-2chan for valid options.
4757 (default 18 - note this can only work with
4759 backlight-pwm-func Pin function of GPIO used for the PWM
4761 See pwm-2chan for valid options.
4763 backlight-def-brightness
4764 Set the default brightness. Normal range 1-16.
4766 rotate Display rotation {0,90,180,270} (default 0)
4769 Name: vc4-kms-dsi-7inch
4770 Info: Enable the Raspberry Pi DSI 7" screen.
4771 Includes the edt-ft5406 for the touchscreen element.
4772 Requires vc4-kms-v3d to be loaded.
4773 Load: dtoverlay=vc4-kms-dsi-7inch,<param>=<val>
4774 Params: sizex Touchscreen size x (default 800)
4775 sizey Touchscreen size y (default 480)
4776 invx Touchscreen inverted x axis
4777 invy Touchscreen inverted y axis
4778 swapxy Touchscreen swapped x y axis
4779 disable_touch Disables the touch screen overlay driver
4780 dsi0 Use DSI0 and i2c_csi_dsi0 (rather than
4781 the default DSI1 and i2c_csi_dsi).
4784 Name: vc4-kms-dsi-lt070me05000
4785 Info: Enable a JDI LT070ME05000 DSI display on DSI1.
4786 Note that this is a 4 lane DSI device, so it will only work on a Compute
4788 Requires vc4-kms-v3d to be loaded.
4789 Load: dtoverlay=vc4-kms-dsi-lt070me05000,<param>
4790 Params: reset GPIO for the reset signal (default 17)
4791 enable GPIO for the enable signal (default 4)
4792 dcdc-en GPIO for the DC-DC converter enable (default 5)
4795 Name: vc4-kms-dsi-lt070me05000-v2
4796 Info: Enable a JDI LT070ME05000 DSI display on DSI1 using Harlab's V2
4798 Note that this is a 4 lane DSI device, so it will only work on a Compute
4800 Requires vc4-kms-v3d to be loaded.
4801 Load: dtoverlay=vc4-kms-dsi-lt070me05000-v2
4805 Name: vc4-kms-dsi-waveshare-panel
4806 Info: Enable a Waveshare DSI touchscreen
4807 Includes the Goodix driver for the touchscreen element.
4808 The default is for the display to be using the I2C0 option for control.
4809 Use the i2c1 override if using the I2C1 wiring with jumper wires from
4810 GPIOs 2&3 (pins 3&5).
4811 invx/invy/swapxy should be used with caution as the panel specifier will
4812 set the default inversions for that panel. Always use them after the
4813 panel specifier, and be aware that you may need to set them as =0, not
4815 Requires vc4-kms-v3d to be loaded.
4816 Load: dtoverlay=vc4-kms-dsi-waveshare-panel,<param>=<val>
4817 Params: 2_8_inch 2.8" 480x640
4818 3_4_inch 3.4" 800x800 round
4819 4_0_inch 4.0" 480x800
4820 7_0_inchC 7.0" C 1024x600
4821 7_9_inch 7.9" 400x1280
4822 8_0_inch 8.0" 1280x800
4823 10_1_inch 10.1" 1280x800
4824 11_9_inch 11.9" 320x1480
4825 i2c1 Use i2c-1 with jumper wires from GPIOs 2&3
4826 disable_touch Disable the touch controller
4827 rotation Set the panel orientation property
4828 invx Touchscreen inverted x axis
4829 invy Touchscreen inverted y axis
4830 swapxy Touchscreen swapped x y axis
4831 dsi0 Use DSI0 and i2c_csi_dsi0 (rather than
4832 the default DSI1 and i2c_csi_dsi).
4835 Name: vc4-kms-kippah-7inch
4836 Info: This overlay is now deprecated - see vc4-kms-dpi-panel,kippah-7inch
4841 Info: Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver.
4842 Load: dtoverlay=vc4-kms-v3d,<param>
4843 Params: cma-512 CMA is 512MB (needs 1GB)
4844 cma-448 CMA is 448MB (needs 1GB)
4845 cma-384 CMA is 384MB (needs 1GB)
4846 cma-320 CMA is 320MB (needs 1GB)
4847 cma-256 CMA is 256MB (needs 1GB)
4848 cma-192 CMA is 192MB (needs 1GB)
4849 cma-128 CMA is 128MB
4852 cma-size CMA size in bytes, 4MB aligned
4853 cma-default Use upstream's default value
4854 audio Enable or disable audio over HDMI (default "on")
4855 noaudio Disable all HDMI audio (default "off")
4856 composite Enable the composite output (default "off")
4857 N.B. Disables all other outputs on a Pi 4.
4858 nohdmi Disable HDMI output
4861 Name: vc4-kms-v3d-pi4
4862 Info: Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver for Pi4.
4863 Load: dtoverlay=vc4-kms-v3d-pi4,<param>
4864 Params: cma-512 CMA is 512MB
4865 cma-448 CMA is 448MB
4866 cma-384 CMA is 384MB
4867 cma-320 CMA is 320MB
4868 cma-256 CMA is 256MB
4869 cma-192 CMA is 192MB
4870 cma-128 CMA is 128MB
4873 cma-size CMA size in bytes, 4MB aligned
4874 cma-default Use upstream's default value
4875 audio Enable or disable audio over HDMI0 (default
4877 audio1 Enable or disable audio over HDMI1 (default
4879 noaudio Disable all HDMI audio (default "off")
4880 composite Enable the composite output (disables all other
4882 nohdmi Disable both HDMI 0 & 1 outputs
4883 nohdmi0 Disable HDMI 0 output
4884 nohdmi1 Disable HDMI 1 output
4887 Name: vc4-kms-v3d-pi5
4888 Info: See vc4-kms-v3d-pi4 (this is the Pi 5 version)
4891 Name: vc4-kms-vga666
4892 Info: Enable the VGA666 (resistor ladder ADC) for the vc4-kms-v3d driver.
4893 Requires vc4-kms-v3d to be loaded.
4894 Load: dtoverlay=vc4-kms-vga666,<param>
4895 Params: ddc Enables GPIOs 0&1 as the I2C to read the EDID
4896 from the display. NB These are NOT 5V tolerant
4897 GPIOs, therefore level shifters are required.
4901 Info: Overlay for the Fen Logic VGA666 board
4902 This uses GPIOs 2-21 (so no I2C), and activates the output 2-3 seconds
4903 after the kernel has started.
4904 NOT for use with vc4-kms-v3d.
4905 Load: dtoverlay=vga666
4910 Info: Overlay to enable a VIA VL805 USB3 controller on CM4 carriers
4911 Will be loaded automatically by up-to-date firmware if "VL805=1" is
4912 set in the EEPROM config.
4913 Load: dtoverlay=vl805
4918 Info: Configures the w1-gpio Onewire interface module.
4919 Use this overlay if you *don't* need a GPIO to drive an external pullup.
4920 Load: dtoverlay=w1-gpio,<param>=<val>
4921 Params: gpiopin GPIO for I/O (default "4")
4922 pullup Now enabled by default (ignored)
4925 Name: w1-gpio-pullup
4926 Info: Configures the w1-gpio Onewire interface module.
4927 Use this overlay if you *do* need a GPIO to drive an external pullup.
4928 Load: dtoverlay=w1-gpio-pullup,<param>=<val>
4929 Params: gpiopin GPIO for I/O (default "4")
4930 extpullup GPIO for external pullup (default "5")
4931 pullup Now enabled by default (ignored)
4935 Info: Overlay for the Wiznet W5500 Ethernet Controller on SPI0
4936 Load: dtoverlay=w5500,<param>=<val>
4937 Params: int_pin GPIO used for INT (default 25)
4939 speed SPI bus speed (default 30000000)
4941 cs SPI bus Chip Select (default 0)
4944 Name: watterott-display
4945 Info: Watterott RPi-Display - 2.8" Touch Display
4946 Linux has 2 drivers that support this display and this overlay supports
4950 fbtft/fb_ili9341: dtoverlay=watterott-display
4951 drm/mi0283qt: dtoverlay=watterott-display,drm,backlight-pwm,rotate=180
4953 Some notable differences with the DRM driver compared to fbtft:
4954 - The display is turned on when it's first used and not on driver load
4955 as with fbtft. So if nothing uses the display it stays off.
4956 - Can run with a higher SPI clock increasing framerate. This is possible
4957 since the driver avoids messing up the controller configuration due to
4958 transmission errors by running config commands at 10MHz and only pixel
4959 data at full speed (occasional pixel glitch might occur).
4960 - PWM backlight is supported.
4962 Load: dtoverlay=watterott-display,<param>=<val>
4963 Params: speed Display SPI bus speed
4964 rotate Display rotation {0,90,180,270}
4965 fps Delay between frame updates (fbtft only)
4966 debug Debug output level {0-7} (fbtft only)
4967 xohms Touchpanel sensitivity (X-plate resistance)
4968 swapxy Swap x and y axis
4969 backlight Change backlight GPIO pin {e.g. 12, 18}
4971 drm Use DRM/KMS driver mi0283qt instead of fbtft.
4972 Set the SPI clock to 70MHz.
4973 This has to be the first parameter.
4974 backlight-pwm Use pwm for backlight (drm only). NB: Disables
4975 audio headphone output as that also uses PWM.
4978 Name: waveshare-can-fd-hat-mode-a
4979 Info: Overlay for the Waveshare 2-Channel Isolated CAN FD Expansion HAT
4980 for Raspberry Pi, Multi Protections. Use this overlay when the
4981 HAT is configured in Mode A (Default), with can0 on spi0.0
4983 https://www.waveshare.com/2-ch-can-fd-hat.htm
4984 Load: dtoverlay=waveshare-can-fd-hat-mode-a
4988 Name: waveshare-can-fd-hat-mode-b
4989 Info: Overlay for the Waveshare 2-Channel Isolated CAN FD Expansion HAT
4990 for Raspberry Pi, Multi Protections. Use this overlay when the
4991 HAT is configured in Mode B (requires hardware modification), with
4992 can0 on spi0.0 and can1 on spi0.1.
4993 https://www.waveshare.com/2-ch-can-fd-hat.htm
4994 Load: dtoverlay=waveshare-can-fd-hat-mode-b
4999 Info: Configures the wittypi RTC module.
5000 Load: dtoverlay=wittypi,<param>=<val>
5001 Params: led_gpio GPIO for LED (default "17")
5002 led_trigger Choose which activity the LED tracks (default
5006 Name: wm8960-soundcard
5007 Info: Overlay for the Waveshare wm8960 soundcard
5008 Load: dtoverlay=wm8960-soundcard,<param>=<val>
5009 Params: alsaname Changes the card name in ALSA
5010 compatible Changes the codec compatibility
5016 If you are experiencing problems that you think are DT-related, enable DT
5017 diagnostic output by adding this to /boot/config.txt:
5021 and rebooting. Then run:
5025 and look for relevant messages.
5030 This is only meant to be a quick introduction to the subject of Device Tree on
5031 Raspberry Pi. There is a more complete explanation here:
5033 http://www.raspberrypi.org/documentation/configuration/device-tree.md
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