The Enhanced Secure Digital Host Controller provides an interface
for MMC, SD, and SDIO types of memory cards.
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the sdhci-esdhc driver.
+
Required properties:
- - compatible : should be
- "fsl,<chip>-esdhc", "fsl,esdhc"
- - reg : should contain eSDHC registers location and length.
- - interrupts : should contain eSDHC interrupt.
- interrupt-parent : interrupt source phandle.
- clock-frequency : specifies eSDHC base clock frequency.
- - sdhci,wp-inverted : (optional) specifies that eSDHC controller
- reports inverted write-protect state; New devices should use
- the generic "wp-inverted" property.
- - sdhci,1-bit-only : (optional) specifies that a controller can
- only handle 1-bit data transfers. New devices should use the
- generic "bus-width = <1>" property.
- - sdhci,auto-cmd12: (optional) specifies that a controller can
- only handle auto CMD12.
+
+Optional properties:
+ - sdhci,wp-inverted : specifies that eSDHC controller reports
+ inverted write-protect state; New devices should use the generic
+ "wp-inverted" property.
+ - sdhci,1-bit-only : specifies that a controller can only handle
+ 1-bit data transfers. New devices should use the generic
+ "bus-width = <1>" property.
+ - sdhci,auto-cmd12: specifies that a controller can only handle auto
+ CMD12.
Example:
The Enhanced Secure Digital Host Controller on Freescale i.MX family
provides an interface for MMC, SD, and SDIO types of memory cards.
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the sdhci-esdhc-imx driver.
+
Required properties:
- compatible : Should be "fsl,<chip>-esdhc"
-- reg : Should contain eSDHC registers location and length
-- interrupts : Should contain eSDHC interrupt
Optional properties:
-- non-removable : Indicate the card is wired to host permanently
- fsl,cd-internal : Indicate to use controller internal card detection
- fsl,wp-internal : Indicate to use controller internal write protection
-- cd-gpios : Specify GPIOs for card detection
-- wp-gpios : Specify GPIOs for write protection
Examples:
MMC/SD/SDIO slot directly connected to a SPI bus
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the mmc_spi driver.
+
Required properties:
-- compatible : should be "mmc-spi-slot".
-- reg : should specify SPI address (chip-select number).
- spi-max-frequency : maximum frequency for this device (Hz).
- voltage-ranges : two cells are required, first cell specifies minimum
slot voltage (mV), second cell specifies maximum slot voltage (mV).
Optional properties:
- gpios : may specify GPIOs in this order: Card-Detect GPIO,
Write-Protect GPIO. Note that this does not follow the
- binding from mmc.txt, for historic reasons.
-- interrupts : the interrupt of a card detect interrupt.
+ binding from mmc.txt, for historical reasons.
- interrupt-parent : the phandle for the interrupt controller that
services interrupts for this device.
* ARM PrimeCell MultiMedia Card Interface (MMCI) PL180/1
-The ARM PrimeCell MMCI PL180 and PL181 provides and interface for
+The ARM PrimeCell MMCI PL180 and PL181 provides an interface for
reading and writing to MultiMedia and SD cards alike.
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the mmci driver.
+
Required properties:
- compatible : contains "arm,pl18x", "arm,primecell".
-- reg : contains pl18x registers and length.
-- interrupts : contains the device IRQ(s).
- arm,primecell-periphid : contains the PrimeCell Peripheral ID.
Optional properties:
-- wp-gpios : contains any write protect (ro) gpios
-- cd-gpios : contains any card detection gpios
-- cd-inverted : indicates whether the cd gpio is inverted
-- max-frequency : contains the maximum operating frequency
-- bus-width : number of data lines, can be <1>, <4>, or <8>
- mmc-cap-mmc-highspeed : indicates whether MMC is high speed capable
- mmc-cap-sd-highspeed : indicates whether SD is high speed capable
The Freescale MXS Synchronous Serial Ports (SSP) can act as a MMC controller
to support MMC, SD, and SDIO types of memory cards.
+This file documents differences between the core properties in mmc.txt
+and the properties used by the mxsmmc driver.
+
Required properties:
- compatible: Should be "fsl,<chip>-mmc". The supported chips include
imx23 and imx28.
-- reg: Should contain registers location and length
- interrupts: Should contain ERROR and DMA interrupts
- fsl,ssp-dma-channel: APBH DMA channel for the SSP
-- bus-width: Number of data lines, can be <1>, <4>, or <8>
-
-Optional properties:
-- wp-gpios: Specify GPIOs for write protection
Examples:
This controller on Tegra family SoCs provides an interface for MMC, SD,
and SDIO types of memory cards.
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the sdhci-tegra driver.
+
Required properties:
- compatible : Should be "nvidia,<chip>-sdhci"
-- reg : Should contain SD/MMC registers location and length
-- interrupts : Should contain SD/MMC interrupt
-- bus-width : Number of data lines, can be <1>, <4>, or <8>
Optional properties:
-- cd-gpios : Specify GPIOs for card detection
-- wp-gpios : Specify GPIOs for write protection
- power-gpios : Specify GPIOs for power control
Example:
The Highspeed MMC Host Controller on TI OMAP family
provides an interface for MMC, SD, and SDIO types of memory cards.
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the omap_hsmmc driver.
+
Required properties:
- compatible:
Should be "ti,omap2-hsmmc", for OMAP2 controllers
Should be "ti,omap3-hsmmc", for OMAP3 controllers
Should be "ti,omap4-hsmmc", for OMAP4 controllers
- ti,hwmods: Must be "mmc<n>", n is controller instance starting 1
-- reg : should contain hsmmc registers location and length
Optional properties:
ti,dual-volt: boolean, supports dual voltage cards
<supply-name>-supply: phandle to the regulator device tree node
"supply-name" examples are "vmmc", "vmmc_aux" etc
-bus-width: Number of data lines, default assumed is 1 if the property is missing.
-cd-gpios: GPIOs for card detection
-wp-gpios: GPIOs for write protection
ti,non-removable: non-removable slot (like eMMC)
ti,needs-special-reset: Requires a special softreset sequence
projects / platform / kernel / linux-amlogic.git / commitdiff