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Commit 8dde8c46 authored by Lee Jones's avatar Lee Jones Committed by Chris Ball
Browse files

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: default avatarLee Jones <lee.jones@linaro.org>
Acked-by: default avatarArnd Bergmann <arndb@arndb.de>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 000bc9d5

Documentation/devicetree/bindings/mmc/mmci.txt

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* ARM PrimeCell MultiMedia Card Interface (MMCI) PL180/1



The ARM PrimeCell MMCI PL180 and PL181 provides and interface for

reading and writing to MultiMedia and SD cards alike.



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