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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>
This commit is contained in:
Lee Jones 2012-03-14 13:58:34 +00:00 committed by Chris Ball
parent 000bc9d5ed
commit 8dde8c4674
1 changed files with 19 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/mmci.txt Normal file
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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