to negotiate. Legal values are 10, 100 and
1000 (default 1000). Pi3B+ only.
+ hdmi Set to "off" to disable the HDMI interface
+ (default "on")
+
i2c_arm Set to "on" to enable the ARM's i2c interface
(default "off")
krnbt_baudrate Set the baudrate of the PL011 UART when used
with krnbt=on
+ pcie Set to "off" to disable the PCIe interface
+ (default "on")
+ (2711 only, but not applicable on CM4S)
+ N.B. USB-A ports on 4B are subsequently disabled
+
spi Set to "on" to enable the spi interfaces
(default "off")
random Set to "on" to enable the hardware random
number generator (default "on")
+ sd Set to "off" to disable the SD card (or eMMC on
+ non-lite SKU of CM4).
+ (default "on")
+
sd_overclock Clock (in MHz) to use when the MMC framework
requests 50MHz
Params: <None>
+Name: arducam-64mp
+Info: Arducam 64MP camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=arducam-64mp,<param>=<val>
+Params: rotation Mounting rotation of the camera sensor (0 or
+ 180, default 0)
+ orientation Sensor orientation (0 = front, 1 = rear,
+ 2 = external, default external)
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+
+
+Name: arducam-pivariety
+Info: Arducam Pivariety camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=arducam-pivariety,<param>=<val>
+Params: rotation Mounting rotation of the camera sensor (0 or
+ 180, default 0)
+ orientation Sensor orientation (0 = front, 1 = rear,
+ 2 = external, default external)
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+
+
Name: at86rf233
Info: Configures the Atmel AT86RF233 802.15.4 low-power WPAN transceiver,
connected to spi0.0
is paused or stopped (default off)
+Name: audioinjector-bare-i2s
+Info: Configures the audioinjector.net audio bare i2s soundcard
+Load: dtoverlay=audioinjector-bare-i2s
+Params: <None>
+
+
Name: audioinjector-isolated-soundcard
Info: Configures the audioinjector.net isolated soundcard
Load: dtoverlay=audioinjector-isolated-soundcard
Load: dtoverlay=audremap,<param>=<val>
Params: swap_lr Reverse the channel allocation, which will also
swap the audio jack outputs (default off)
- enable_jack Don't switch off the audio jack output
- (default off)
+ enable_jack Don't switch off the audio jack output. Does
+ nothing on BCM2711 (default off)
pins_12_13 Select GPIOs 12 & 13 (default)
pins_18_19 Select GPIOs 18 & 19
+ pins_40_41 Select GPIOs 40 & 41
+ pins_40_45 Select GPIOs 40 & 45 (don't use on BCM2711 - the
+ pins are on different controllers)
Name: balena-fin
Load: <Deprecated>
+Name: camera-mux-2port
+Info: Configures a 2 port camera multiplexer
+ Note that currently ALL IMX290 modules share a common clock, therefore
+ all modules will need to have the same clock frequency.
+Load: dtoverlay=camera-mux-2port,<param>=<val>
+Params: cam0-imx219 Select IMX219 for camera on port 0
+ cam0-imx258 Select IMX258 for camera on port 0
+ cam0-imx290 Select IMX290 for camera on port 0
+ cam0-imx477 Select IMX477 for camera on port 0
+ cam0-imx708 Select IMX708 for camera on port 0
+ cam0-ov2311 Select OV2311 for camera on port 0
+ cam0-ov5647 Select OV5647 for camera on port 0
+ cam0-ov7251 Select OV7251 for camera on port 0
+ cam0-ov9281 Select OV9281 for camera on port 0
+ cam0-imx290-clk-freq Set clock frequency for an IMX290 on port 0
+ cam1-imx219 Select IMX219 for camera on port 1
+ cam1-imx258 Select IMX258 for camera on port 1
+ cam1-imx290 Select IMX290 for camera on port 1
+ cam1-imx477 Select IMX477 for camera on port 1
+ cam1-imx708 Select IMX708 for camera on port 1
+ cam1-ov2311 Select OV2311 for camera on port 1
+ cam1-ov5647 Select OV5647 for camera on port 1
+ cam1-ov7251 Select OV7251 for camera on port 1
+ cam1-ov9281 Select OV9281 for camera on port 1
+ cam1-imx290-clk-freq Set clock frequency for an IMX290 on port 1
+
+
+Name: camera-mux-4port
+Info: Configures a 4 port camera multiplexer
+ Note that currently ALL IMX290 modules share a common clock, therefore
+ all modules will need to have the same clock frequency.
+Load: dtoverlay=camera-mux-4port,<param>=<val>
+Params: cam0-imx219 Select IMX219 for camera on port 0
+ cam0-imx258 Select IMX258 for camera on port 0
+ cam0-imx290 Select IMX290 for camera on port 0
+ cam0-imx477 Select IMX477 for camera on port 0
+ cam0-imx708 Select IMX708 for camera on port 0
+ cam0-ov2311 Select OV2311 for camera on port 0
+ cam0-ov5647 Select OV5647 for camera on port 0
+ cam0-ov7251 Select OV7251 for camera on port 0
+ cam0-ov9281 Select OV9281 for camera on port 0
+ cam0-imx290-clk-freq Set clock frequency for an IMX290 on port 0
+ cam1-imx219 Select IMX219 for camera on port 1
+ cam1-imx258 Select IMX258 for camera on port 1
+ cam1-imx290 Select IMX290 for camera on port 1
+ cam1-imx477 Select IMX477 for camera on port 1
+ cam1-imx708 Select IMX708 for camera on port 1
+ cam1-ov2311 Select OV2311 for camera on port 1
+ cam1-ov5647 Select OV5647 for camera on port 1
+ cam1-ov7251 Select OV7251 for camera on port 1
+ cam1-ov9281 Select OV9281 for camera on port 1
+ cam1-imx290-clk-freq Set clock frequency for an IMX290 on port 1
+ cam2-imx219 Select IMX219 for camera on port 2
+ cam2-imx258 Select IMX258 for camera on port 2
+ cam2-imx290 Select IMX290 for camera on port 2
+ cam2-imx477 Select IMX477 for camera on port 2
+ cam2-imx708 Select IMX708 for camera on port 2
+ cam2-ov2311 Select OV2311 for camera on port 2
+ cam2-ov5647 Select OV5647 for camera on port 2
+ cam2-ov7251 Select OV7251 for camera on port 2
+ cam2-ov9281 Select OV9281 for camera on port 2
+ cam2-imx290-clk-freq Set clock frequency for an IMX290 on port 2
+ cam3-imx219 Select IMX219 for camera on port 3
+ cam3-imx258 Select IMX258 for camera on port 3
+ cam3-imx290 Select IMX290 for camera on port 3
+ cam3-imx477 Select IMX477 for camera on port 3
+ cam3-imx708 Select IMX708 for camera on port 3
+ cam3-ov2311 Select OV2311 for camera on port 3
+ cam3-ov5647 Select OV5647 for camera on port 3
+ cam3-ov7251 Select OV7251 for camera on port 3
+ cam3-ov9281 Select OV9281 for camera on port 3
+ cam3-imx290-clk-freq Set clock frequency for an IMX290 on port 3
+
+
Name: cap1106
Info: Enables the ability to use the cap1106 touch sensor as a keyboard
Load: dtoverlay=cap1106,<param>=<val>
Params: <None>
+Name: cirrus-wm5102
+Info: Configures the Cirrus Logic Audio Card
+Load: dtoverlay=cirrus-wm5102
+Params: <None>
+
+
Name: cma
Info: Set custom CMA sizes, only use if you know what you are doing, might
clash with other overlays like vc4-fkms-v3d and vc4-kms-v3d.
Params: <None>
+Name: dacberry400
+Info: Configures the dacberry400 add on soundcard
+Load: dtoverlay=dacberry400
+Params: <None>
+
+
Name: dht11
Info: Overlay for the DHT11/DHT21/DHT22 humidity/temperature sensors
Also sometimes found with the part number(s) AM230x.
(default 4)
+Name: dionaudio-kiwi
+Info: Configures the Dion Audio KIWI STREAMER
+Load: dtoverlay=dionaudio-kiwi
+Params: <None>
+
+
Name: dionaudio-loco
Info: Configures the Dion Audio LOCO DAC-AMP
Load: dtoverlay=dionaudio-loco
Params: fsm_debug Enable debug logging (default off)
+Name: gc9a01
+Info: Enables GalaxyCore's GC9A01 single chip driver based displays on
+ SPI0 as fb1, using GPIOs DC=25, RST=27 and BL=18 (physical
+ GPIO header pins 22, 13 and 12 respectively) in addition to the
+ SPI0 pins DIN=10, CLK=11 and CS=8 (physical GPIO header pins 19,
+ 23 and 24 respectively).
+Load: dtoverlay=gc9a01,<param>=<val>
+Params: speed Display SPI bus speed
+
+ rotate Display rotation {0,90,180,270}
+
+ width Width of the display
+
+ height Height of the display
+
+ fps Delay between frame updates
+
+ debug Debug output level {0-7}
+
+
Name: ghost-amp
Info: An overlay for the Ghost amplifier.
Load: dtoverlay=ghost-amp,<param>=<val>
Params: gpiopin GPIO used to control the fan (default 12)
temp Temperature at which the fan switches on, in
millicelcius (default 55000)
+ hyst Temperature delta (in millicelcius) below
+ temp at which the fan will drop to minrpm
+ (default 10000)
+
+
+Name: gpio-hog
+Info: Activate a "hog" for a GPIO - request that the kernel configures it as
+ an output, driven low or high as indicated by the presence or absence
+ of the active_low parameter. Note that a hogged GPIO is not available
+ to other drivers or for gpioset/gpioget.
+Load: dtoverlay=gpio-hog,<param>=<val>
+Params: gpio GPIO pin to hog (default 26)
+ active_low If set, the hog drives the GPIO low (defaults
+ to off - the GPIO is driven high)
Name: gpio-ir
Will be overwritten by ALSA user settings.
+Name: hifiberry-amp3
+Info: Configures the HifiBerry Amp3 audio card
+Load: dtoverlay=hifiberry-amp3
+Params: <None>
+
+
Name: hifiberry-dac
Info: Configures the HifiBerry DAC audio cards
Load: dtoverlay=hifiberry-dac
Params: <None>
+Name: i2c-fan
+Info: Adds support for a number of I2C fan controllers
+Load: dtoverlay=i2c-fan,<param>=<val>
+Params: addr Sets the address for the fan controller. Note
+ that the device must be configured to use the
+ specified address.
+
+ i2c0 Choose the I2C0 bus on GPIOs 0&1
+
+ i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
+
+ i2c3 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c4 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c5 Choose the I2C5 bus (configure with the i2c4
+ overlay - BCM2711 only)
+
+ i2c6 Choose the I2C6 bus (configure with the i2c6
+ overlay - BCM2711 only)
+
+ minpwm PWM setting for the fan when the SoC is below
+ mintemp (range 0-255. default 0)
+ maxpwm PWM setting for the fan when the SoC is above
+ maxtemp (range 0-255. default 255)
+ midtemp Temperature (in millicelcius) at which the fan
+ begins to speed up (default 50000)
+
+ midtemp_hyst Temperature delta (in millicelcius) below
+ mintemp at which the fan will drop to minrpm
+ (default 2000)
+
+ maxtemp Temperature (in millicelcius) at which the fan
+ will be held at maxrpm (default 70000)
+
+ maxtemp_hyst Temperature delta (in millicelcius) below
+ maxtemp at which the fan begins to slow down
+ (default 2000)
+
+ emc2301 Select the Microchip EMC230x controller family
+ - EMC2301, EMC2302, EMC2303, EMC2305.
+
+
Name: i2c-gpio
Info: Adds support for software i2c controller on gpio pins
Load: dtoverlay=i2c-gpio,<param>=<val>
rv3028 Select the Micro Crystal RV3028 device
+ rv3032 Select the Micro Crystal RV3032 device
+
+ rv8803 Select the Micro Crystal RV8803 device
+
sd3078 Select the ZXW Shenzhen whwave SD3078 device
s35390a Select the ABLIC S35390A device
i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
+ i2c3 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c4 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c5 Choose the I2C5 bus (configure with the i2c4
+ overlay - BCM2711 only)
+
+ i2c6 Choose the I2C6 bus (configure with the i2c6
+ overlay - BCM2711 only)
+
addr Sets the address for the RTC. Note that the
device must be configured to use the specified
address.
rv3028 Select the Micro Crystal RV3028 device
+ rv3032 Select the Micro Crystal RV3032 device
+
+ rv8803 Select the Micro Crystal RV8803 device
+
sd3078 Select the ZXW Shenzhen whwave SD3078 device
s35390a Select the ABLIC S35390A device
BMP280, CCS811, DS1621, HDC100X, LM75, SHT3x or
TMP102
+ aht10 Select the Aosong AHT10 temperature and humidity
+ sensor
+
bh1750 Select the Rohm BH1750 ambient light sensor
Valid addresses 0x23 or 0x5c, default 0x23
int_pin Set the GPIO to use for interrupts (max30102
only)
+ jc42 Select any of the many JEDEC JC42.4-compliant
+ temperature sensors, including:
+ ADT7408, AT30TS00, CAT34TS02, CAT6095,
+ MAX6604, MCP9804, MCP9805, MCP9808,
+ MCP98242, MCP98243, MCP98244, MCP9843,
+ SE97, SE98, STTS424(E), STTS2002, STTS3000,
+ TSE2002, TSE2004, TS3000, and TS3001.
+ The default address is 0x18.
+
lm75 Select the Maxim LM75 temperature sensor
Valid addresses 0x48-0x4f, default 0x4f
max30102 Select the Maxim Integrated MAX30102 heart-rate
and blood-oxygen sensor
+ mcp980x Select the Maxim MCP980x range of temperature
+ sensors (i.e. MCP9800, MCP9801, MCP9802 and
+ MCP9803). N.B. For MCP9804, MCP9805 and MCP9808,
+ use the "jc42" option.
+ Valid addresses are 0x18-0x1f (default 0x18)
+
sht3x Select the Sensiron SHT3x temperature and
humidity sensor. Valid addresses 0x44-0x45,
default 0x44
veml6070 Select the Vishay VEML6070 ultraviolet light
sensor
+ i2c0 Choose the I2C0 bus on GPIOs 0&1
+
+ i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
+
+ i2c3 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c4 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c5 Choose the I2C5 bus (configure with the i2c4
+ overlay - BCM2711 only)
+
+ i2c6 Choose the I2C6 bus (configure with the i2c6
+ overlay - BCM2711 only)
+
Name: i2c0
Info: Change i2c0 pin usage. Not all pin combinations are usable on all
"100000")
+Name: i2s-dac
+Info: Configures any passive I2S DAC soundcard.
+Load: dtoverlay=i2s-dac
+Params: <None>
+
+
Name: i2s-gpio28-31
Info: move I2S function block to GPIO 28 to 31
Load: dtoverlay=i2s-gpio28-31
configuring the sensor (default on)
cam0 Adopt the default configuration for CAM0 on a
Compute Module (CSI0, i2c_vc, and cam0_reg).
+ vcm Configure a VCM focus drive on the sensor.
+
+
+Name: imx258
+Info: Sony IMX258 camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=imx258,<param>=<val>
+Params: rotation Mounting rotation of the camera sensor (0 or
+ 180, default 180)
+ orientation Sensor orientation (0 = front, 1 = rear,
+ 2 = external, default external)
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+ vcm Configure a VCM focus drive on the sensor.
+ 4lane Enable 4 CSI2 lanes. This requires a Compute
+ Module (1, 3, or 4).
Name: imx290
Info: Sony IMX290 camera module.
Uses Unicam 1, which is the standard camera connector on most Pi
- variants. NB This currently uses 4 CSI2 data lanes and therefore will
- only work on a CM.
+ variants.
Load: dtoverlay=imx290,<param>
Params: 4lane Enable 4 CSI2 lanes. This requires a Compute
Module (1, 3, or 4).
Compute Module (CSI0, i2c_vc, and cam0_reg).
+Name: imx296
+Info: Sony IMX296 camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=imx296,<param>=<val>
+Params: rotation Mounting rotation of the camera sensor (0 or
+ 180, default 180)
+ orientation Sensor orientation (0 = front, 1 = rear,
+ 2 = external, default external)
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+ clock-frequency Sets the clock frequency to match that used on
+ the board, which should be one of 54000000
+ (the default), 37125000 or 74250000.
+
+
+Name: imx327
+Info: Sony IMX327 camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=imx327,<param>
+Params: 4lane Enable 4 CSI2 lanes. This requires a Compute
+ Module (1, 3, or 4).
+ clock-frequency Sets the clock frequency to match that used on
+ the board.
+ Modules from Vision Components use 37.125MHz
+ (the default), whilst those from Innomaker use
+ 74.25MHz.
+ mono Denote that the module is a mono sensor.
+ orientation Sensor orientation (0 = front, 1 = rear,
+ 2 = external, default external)
+ rotation Mounting rotation of the camera sensor (0 or
+ 180, default 0)
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+
+
Name: imx378
Info: Sony IMX378 camera module.
Uses Unicam 1, which is the standard camera connector on most Pi
Compute Module (CSI0, i2c_vc, and cam0_reg).
+Name: imx462
+Info: Sony IMX462 camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=imx462,<param>
+Params: 4lane Enable 4 CSI2 lanes. This requires a Compute
+ Module (1, 3, or 4).
+ clock-frequency Sets the clock frequency to match that used on
+ the board.
+ Modules from Vision Components use 37.125MHz
+ (the default), whilst those from Innomaker use
+ 74.25MHz.
+ mono Denote that the module is a mono sensor.
+ orientation Sensor orientation (0 = front, 1 = rear,
+ 2 = external, default external)
+ rotation Mounting rotation of the camera sensor (0 or
+ 180, default 0)
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+
+
Name: imx477
Info: Sony IMX477 camera module.
Uses Unicam 1, which is the standard camera connector on most Pi
Compute Module (CSI0, i2c_vc, and cam0_reg).
+Name: imx708
+Info: Sony IMX708 camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=imx708,<param>=<val>
+Params: rotation Mounting rotation of the camera sensor (0 or
+ 180, default 180)
+ vcm Select lens driver state. Default is enabled,
+ but vcm=off will disable.
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+
+
Name: iqaudio-codec
Info: Configures the IQaudio Codec audio card
Load: dtoverlay=iqaudio-codec
driver without need of hciattach/btattach
+Name: mipi-dbi-spi
+Info: Overlay for SPI-connected MIPI DBI displays using the panel-mipi-dbi
+ driver. The driver will load a file /lib/firmware/panel.bin containing
+ the initialisation commands.
+
+ Example:
+ dtoverlay=mipi-dbi-spi,spi0-0,speed=70000000
+ dtparam=width=320,height=240
+ dtparam=reset-gpio=23,dc-gpio=24
+ dtparam=backlight-gpio=18
+
+ Compared to fbtft panel-mipi-dbi runs pixel data at spi-max-frequency
+ and init commands at 10MHz. This makes it possible to push the envelope
+ without messing up the controller configuration due to command
+ transmission errors.
+
+ For devices on spi1 or spi2, the interfaces should be enabled
+ with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
+
+ See https://github.com/notro/panel-mipi-dbi/wiki for more info.
+
+Load: dtoverlay=mipi-dbi-spi,<param>=<val>
+Params:
+ compatible Set the compatible string to load a different
+ firmware file. Both the panel compatible value
+ used to load the firmware file and the value
+ used to load the driver has to be set having a
+ NUL (\0) separator between them.
+ Example:
+ dtparam=compatible=mypanel\0panel-mipi-dbi-spi
+ spi<n>-<m> Configure device at spi<n>, cs<m>
+ (boolean, required)
+ speed SPI bus speed in Hz (default 32000000)
+ cpha Shifted SPI clock phase (CPHA) mode
+ cpol Inverse SPI clock polarity (CPOL) mode
+ write-only Controller is not readable
+ (ie. MISO is not wired up).
+
+ width Panel width in pixels (required)
+ height Panel height in pixels (required)
+ width-mm Panel width in mm
+ height-mm Panel height in mm
+ x-offset Panel x-offset in controller RAM
+ y-offset Panel y-offset in controller RAM
+
+ clock-frequency Panel clock frequency in Hz
+ (optional, just informational).
+
+ reset-gpio GPIO pin to be used for RESET
+ dc-gpio GPIO pin to be used for D/C
+
+ backlight-gpio GPIO pin to be used for backlight control
+ (default of none).
+ backlight-pwm PWM channel to be used for backlight control
+ (default of none). NB Disables audio headphone
+ output as that also uses PWM.
+ backlight-pwm-chan Choose channel on &pwm node for backlight
+ control (default 0).
+ backlight-pwm-gpio GPIO pin to be used for the PWM backlight. See
+ pwm-2chan for valid options (default 18).
+ backlight-pwm-func Pin function of GPIO used for the PWM backlight.
+ See pwm-2chan for valid options (default 2).
+ backlight-def-brightness
+ Set the default brightness. Normal range 1-16.
+ (default 16).
+
+
Name: mlx90640
Info: Overlay for i2c connected mlx90640 thermal camera
Load: dtoverlay=mlx90640
xohms Touchpanel sensitivity (X-plate resistance)
+Name: ov2311
+Info: Omnivision OV2311 camera module.
+ Uses Unicam 1, which is the standard camera connector on most Pi
+ variants.
+Load: dtoverlay=ov2311,<param>=<val>
+Params: rotation Mounting rotation of the camera sensor (0 or
+ 180, default 0)
+ orientation Sensor orientation (0 = front, 1 = rear,
+ 2 = external, default external)
+ media-controller Configure use of Media Controller API for
+ configuring the sensor (default on)
+ cam0 Adopt the default configuration for CAM0 on a
+ Compute Module (CSI0, i2c_vc, and cam0_reg).
+
+
Name: ov5647
Info: Omnivision OV5647 camera module.
Uses Unicam 1, which is the standard camera connector on most Pi
configuring the sensor (default on)
cam0 Adopt the default configuration for CAM0 on a
Compute Module (CSI0, i2c_vc, and cam0_reg).
+ vcm Configure a VCM focus drive on the sensor.
Name: ov7251
debug Debug output level {0-7}
+ drm Force the use of the mi0283qt DRM driver (by
+ default the ili9340 framebuffer driver will
+ be used in preference if available)
+
Name: pitft35-resistive
Info: Adafruit PiTFT 3.5" resistive touch screen
debug Debug output level {0-7}
+ drm Force the use of the hx8357d DRM driver (by
+ default the fb_hx8357d framebuffer driver will
+ be used in preference if available)
+
Name: pps-gpio
Info: Configures the pps-gpio (pulse-per-second time signal via GPIO).
off)
capture_clear Generate clear events on the trailing edge
(default off)
+ pull Desired pull-up/down state (off, down, up)
+ Default is "off".
+
+
+Name: proto-codec
+Info: Configures the PROTO Audio Codec card
+Load: dtoverlay=proto-codec
+Params: <None>
Name: pwm
func Pin function (default 2 = Alt5)
+Name: pwm1
+Info: Configures one or two PWM channel on PWM1 (BCM2711 only)
+ N.B.:
+ 1) The onboard analogue audio output uses both PWM channels.
+ 2) So be careful mixing audio and PWM.
+ Note that even when only one pin is enabled, both channels are available
+ from the PWM driver, so be careful to use the correct one.
+Load: dtoverlay=pwm1,<param>=<val>
+Params: clock PWM clock frequency (informational)
+ pins_40 Enable channel 0 (PWM1_0) on GPIO 40
+ pins_41 Enable channel 1 (PWM1_1) on GPIO 41
+ pins_40_41 Enable channels 0 (PWM1_0) and 1 (PW1_1) on
+ GPIOs 40 and 41 (default)
+ pull_up Enable pull-ups on the PWM pins (default)
+ pull_down Enable pull-downs on the PWM pins
+ pull_off Disable pulls on the PWM pins
+
+
Name: qca7000
Info: in-tech's Evaluation Board for PLC Stamp micro
This uses spi0 and a separate GPIO interrupt to connect the QCA7000.
"115200")
+Name: ramoops
+Info: Enable the preservation of crash logs across a reboot. With
+ systemd-pstore enabled (as it is on Raspberry Pi OS) the crash logs
+ are moved to /var/lib/systemd/pstore/ on reboot.
+Load: dtoverlay=ramoops,<param>=<val>
+Params: base-addr Where to place the capture buffer (default
+ 0x0b000000)
+ total-size How much memory to allocate altogether (in
+ bytes - default 64kB)
+ record-size How much space to use for each capture, i.e.
+ total-size / record-size = number of captures
+ (default 16kB)
+ console-size Size of non-panic dmesg captures (default 0)
+
+
+Name: ramoops-pi4
+Info: The version of the ramoops overlay for the Pi 4 family. It should be
+ loaded automatically if dtoverlay=ramoops is specified on a Pi 4.
+Load: dtoverlay=ramoops-pi4,<param>=<val>
+Params: base-addr Where to place the capture buffer (default
+ 0x0b000000)
+ total-size How much memory to allocate altogether (in
+ bytes - default 64kB)
+ record-size How much space to use for each capture, i.e.
+ total-size / record-size = number of captures
+ (default 16kB)
+ console-size Size of non-panic dmesg captures (default 0)
+
+
Name: rotary-encoder
Info: Overlay for GPIO connected rotary encoder.
Load: dtoverlay=rotary-encoder,<param>=<val>
Name: rpi-cirrus-wm5102
-Info: Configures the Cirrus Logic Audio Card
-Load: dtoverlay=rpi-cirrus-wm5102
+Info: This overlay has been renamed to cirrus-wm5102
+Load: <Deprecated>
+
+
+Name: rpi-codeczero
+Info: Configures the Raspberry Pi Codec Zero sound card
+Load: dtoverlay=rpi-codeczero
Params: <None>
Name: rpi-dac
-Info: Configures the RPi DAC audio card
-Load: dtoverlay=rpi-dac
-Params: <None>
+Info: This overlay has been renaamed to i2s-dac.
+Load: <Deprecated>
+
+
+Name: rpi-dacplus
+Info: Configures the Raspberry Pi DAC+ card
+Load: dtoverlay=rpi-dacplus,<param>=<val>
+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
+ digital volume control. Enable by adding
+ "dtparam=24db_digital_gain" to config.txt
+ before any "dtoverlay" lines.
+ The default behaviour is that the digital
+ volume control is limited to a maximum of
+ 0dB. ie. it can attenuate but not provide
+ gain. For most users, this will be desired
+ as it will prevent clipping. By appending
+ the 24db_digital_gain parameter, the digital
+ volume control will allow up to 24dB of
+ gain. If this parameter is enabled, it is the
+ responsibility of the user to ensure that
+ the digital volume control is set to a value
+ that does not result in clipping/distortion!
+
+
+Name: rpi-dacpro
+Info: Configures the Raspberry Pi DAC Pro sound card
+Load: dtoverlay=rpi-dacpro,<param>=<val>
+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
+ digital volume control. Enable by adding
+ "dtparam=24db_digital_gain" to config.txt
+ before any "dtoverlay" lines.
+ The default behaviour is that the digital
+ volume control is limited to a maximum of
+ 0dB. ie. it can attenuate but not provide
+ gain. For most users, this will be desired
+ as it will prevent clipping. By appending
+ the 24db_digital_gain parameter, the digital
+ volume control will allow up to 24dB of
+ gain. If this parameter is enabled, it is the
+ responsibility of the user to ensure that
+ the digital volume control is set to a value
+ that does not result in clipping/distortion!
+
+
+Name: rpi-digiampplus
+Info: Configures the Raspberry Pi DigiAMP+ sound card
+Load: dtoverlay=rpi-digiampplus,<param>=<val>
+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
+ digital volume control. Enable by adding
+ "dtparam=24db_digital_gain" to config.txt
+ before any "dtoverlay" lines.
+ The default behaviour is that the digital
+ volume control is limited to a maximum of
+ 0dB. ie. it can attenuate but not provide
+ gain. For most users, this will be desired
+ as it will prevent clipping. By appending
+ the 24db_digital_gain parameter, the digital
+ volume control will allow up to 24dB of
+ gain. If this parameter is enabled, it is the
+ responsibility of the user to ensure that
+ the digital volume control is set to a value
+ that does not result in clipping/distortion!
+ auto_mute_amp If specified, unmute/mute the DigiAMP+ when
+ starting/stopping audio playback (default "on").
+ unmute_amp If specified, unmute the DigiAMP+ amp once when
+ the DAC driver module loads (default "off").
Name: rpi-display
-Info: RPi-Display - 2.8" Touch Display by Watterott
-Load: dtoverlay=rpi-display,<param>=<val>
-Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
- debug Debug output level {0-7}
- xohms Touchpanel sensitivity (X-plate resistance)
- swapxy Swap x and y axis
- backlight Change backlight GPIO pin {e.g. 12, 18}
+Info: This overlay has been renamed to watterott-display
+Load: <Deprecated>
Name: rpi-ft5406
Name: rpi-proto
-Info: Configures the RPi Proto audio card
-Load: dtoverlay=rpi-proto
-Params: <None>
+Info: This overlay has been renamaed to proto-codec.
+Load: <Deprecated>
Name: rpi-sense
Params: <None>
+Name: rpi-sense-v2
+Info: Raspberry Pi Sense HAT v2
+Load: dtoverlay=rpi-sense-v2
+Params: <None>
+
+
Name: rpi-tv
Info: Raspberry Pi TV HAT
Load: dtoverlay=rpi-tv
Name: rpivid-v4l2
-Info: Load the V4L2 stateless video decoder driver for the HEVC block,
- disabling the memory mapped devices in the process.
-Load: dtoverlay=rpivid-v4l2
-Params: <None>
+Info: This overlay has been deprecated and deleted as the V4L2 stateless
+ video decoder driver is enabled by default.
+Load: <Deprecated>
Name: rra-digidac1-wm8741-audio
width-mm Define the screen width in mm
height-mm Define the screen height in mm
rgb565 Change to RGB565 output on GPIOs 0-19
+ rgb565-padhi Change to RGB565 output on GPIOs 0-8, 12-17, and
+ 20-24
+ bgr666 Change to BGR666 output on GPIOs 0-21.
+ bgr666-padhi Change to BGR666 output on GPIOs 0-9, 12-17, and
+ 20-25
rgb666-padhi Change to RGB666 output on GPIOs 0-9, 12-17, and
20-25
+ bgr888 Change to BGR888 output on GPIOs 0-27
rgb888 Change to RGB888 output on GPIOs 0-27
bus-format Override the bus format for a MEDIA_BUS_FMT_*
value. NB also overridden by rgbXXX overrides.
backlight-def-brightness
Set the default brightness. Normal range 1-16.
(default 16).
+ rotate Display rotation {0,90,180,270} (default 0)
+
+
+Name: vc4-kms-dpi-hyperpixel2r
+Info: Enable the KMS drivers for the Pimoroni HyperPixel2 Round DPI display.
+ Requires vc4-kms-v3d to be loaded.
+Load: dtoverlay=vc4-kms-dpi-hyperpixel2r,<param>=<val>
+Params: disable-touch Disables the touch controller
+ touchscreen-inverted-x Inverts X direction of touch controller
+ touchscreen-inverted-y Inverts Y direction of touch controller
+ touchscreen-swapped-x-y Swaps X & Y axes of touch controller
+ rotate Display rotation {0,90,180,270} (default 0)
+
+
+Name: vc4-kms-dpi-hyperpixel4
+Info: Enable the KMS drivers for the Pimoroni HyperPixel4 DPI display.
+ Requires vc4-kms-v3d to be loaded.
+Load: dtoverlay=vc4-kms-dpi-hyperpixel4,<param>=<val>
+Params: disable-touch Disables the touch controller
+ touchscreen-inverted-x Inverts X direction of touch controller
+ touchscreen-inverted-y Inverts Y direction of touch controller
+ touchscreen-swapped-x-y Swaps X & Y axes of touch controller
+ rotate Display rotation {0,90,180,270} (default 0)
+
+
+Name: vc4-kms-dpi-hyperpixel4sq
+Info: Enable the KMS drivers for the Pimoroni HyperPixel4 Square DPI display.
+ Requires vc4-kms-v3d to be loaded.
+Load: dtoverlay=vc4-kms-dpi-hyperpixel4sq,<param>=<val>
+Params: disable-touch Disables the touch controller
+ touchscreen-inverted-x Inverts X direction of touch controller
+ touchscreen-inverted-y Inverts Y direction of touch controller
+ touchscreen-swapped-x-y Swaps X & Y axes of touch controller
+ rotate Display rotation {0,90,180,270} (default 0)
Name: vc4-kms-dpi-panel
Load: dtoverlay=vc4-kms-dpi-panel,<param>=<val>
Params: at056tn53v1 Enable an Innolux 5.6in VGA TFT
kippah-7inch Enable an Adafruit Kippah with 7inch panel.
+ mzp280 Enable a Geekworm MZP280 panel.
backlight-gpio Defines a GPIO to be used for backlight control
(default of none).
backlight-pwm Defines a PWM channel to be used for backlight
backlight-def-brightness
Set the default brightness. Normal range 1-16.
(default 16).
+ rotate Display rotation {0,90,180,270} (default 0)
Name: vc4-kms-dsi-7inch
noaudio Disable all HDMI audio (default "off")
composite Enable the composite output (default "off")
N.B. Disables all other outputs on a Pi 4.
+ nohdmi Disable HDMI output
Name: vc4-kms-v3d-pi4
noaudio Disable all HDMI audio (default "off")
composite Enable the composite output (disables all other
outputs)
+ nohdmi Disable both HDMI 0 & 1 outputs
+ nohdmi0 Disable HDMI 0 output
+ nohdmi1 Disable HDMI 1 output
+
Name: vc4-kms-vga666
cs SPI bus Chip Select (default 0)
+Name: watterott-display
+Info: Watterott RPi-Display - 2.8" Touch Display
+ Linux has 2 drivers that support this display and this overlay supports
+ both.
+
+ Examples:
+ fbtft/fb_ili9341: dtoverlay=watterott-display
+ drm/mi0283qt: dtoverlay=watterott-display,drm,backlight-pwm,rotate=180
+
+ Some notable differences with the DRM driver compared to fbtft:
+ - The display is turned on when it's first used and not on driver load
+ as with fbtft. So if nothing uses the display it stays off.
+ - Can run with a higher SPI clock increasing framerate. This is possible
+ since the driver avoids messing up the controller configuration due to
+ transmission errors by running config commands at 10MHz and only pixel
+ data at full speed (occasional pixel glitch might occur).
+ - PWM backlight is supported.
+
+Load: dtoverlay=watterott-display,<param>=<val>
+Params: speed Display SPI bus speed
+ rotate Display rotation {0,90,180,270}
+ fps Delay between frame updates (fbtft only)
+ debug Debug output level {0-7} (fbtft only)
+ xohms Touchpanel sensitivity (X-plate resistance)
+ swapxy Swap x and y axis
+ backlight Change backlight GPIO pin {e.g. 12, 18}
+ (fbtft only)
+ drm Use DRM/KMS driver mi0283qt instead of fbtft.
+ Set the SPI clock to 70MHz.
+ This has to be the first parameter.
+ backlight-pwm Use pwm for backlight (drm only). NB: Disables
+ audio headphone output as that also uses PWM.
+
+
+Name: waveshare-can-fd-hat-mode-a
+Info: Overlay for the Waveshare 2-Channel Isolated CAN FD Expansion HAT
+ for Raspberry Pi, Multi Protections. Use this overlay when the
+ HAT is configured in Mode A (Default), with can0 on spi0.0
+ and can1 on spi1.0.
+ https://www.waveshare.com/2-ch-can-fd-hat.htm
+Load: dtoverlay=waveshare-can-fd-hat-mode-a
+Params: <None>
+
+
+Name: waveshare-can-fd-hat-mode-b
+Info: Overlay for the Waveshare 2-Channel Isolated CAN FD Expansion HAT
+ for Raspberry Pi, Multi Protections. Use this overlay when the
+ HAT is configured in Mode B (requires hardware modification), with
+ can0 on spi0.0 and can1 on spi0.1.
+ https://www.waveshare.com/2-ch-can-fd-hat.htm
+Load: dtoverlay=waveshare-can-fd-hat-mode-b
+Params: <None>
+
+
Name: wittypi
Info: Configures the wittypi RTC module.
Load: dtoverlay=wittypi,<param>=<val>
projects / platform / kernel / linux-rpi.git / blobdiff