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alistair23-linux/Documentation/devicetree/bindings/mmc/mxs-mmc.txt

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* Freescale MXS MMC controller
The Freescale MXS Synchronous Serial Ports (SSP) can act as a MMC controller
to support MMC, SD, and SDIO types of memory cards.
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:
ssp0: ssp@80010000 {
compatible = "fsl,imx28-mmc";
reg = <0x80010000 2000>;
interrupts = <96 82>;
fsl,ssp-dma-channel = <0>;
bus-width = <8>;
};