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mmc: mmci: Add required documentation for Device Tree bindings
This provides full documentation detailing each compulsory, optional and device (variant) specific properties available for use within the MMCI Device Tree. Signed-off-by: Lee Jones <lee.jones@linaro.org> Acked-by: Arnd Bergmann <arndb@arndb.de> Signed-off-by: Chris Ball <cjb@laptop.org>
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Documentation/devicetree/bindings/mmc/mmci.txt
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Documentation/devicetree/bindings/mmc/mmci.txt
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* ARM PrimeCell MultiMedia Card Interface (MMCI) PL180/1
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The ARM PrimeCell MMCI PL180 and PL181 provides and interface for
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reading and writing to MultiMedia and SD cards alike.
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Required properties:
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- compatible : contains "arm,pl18x", "arm,primecell".
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- reg : contains pl18x registers and length.
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- interrupts : contains the device IRQ(s).
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- arm,primecell-periphid : contains the PrimeCell Peripheral ID.
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Optional properties:
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- wp-gpios : contains any write protect (ro) gpios
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- cd-gpios : contains any card detection gpios
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- cd-inverted : indicates whether the cd gpio is inverted
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- max-frequency : contains the maximum operating frequency
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- bus-width : number of data lines, can be <1>, <4>, or <8>
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- mmc-cap-mmc-highspeed : indicates whether MMC is high speed capable
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- mmc-cap-sd-highspeed : indicates whether SD is high speed capable
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