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mmc: pwrseq: Document optional clock for the simple power sequence 

Some WLAN chips attached to a SDIO interface, need an external clock
to be operational. Since this is very common, extend the simple MMC
power sequence DT binding to support an optional clock.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Javier Martinez Canillas 2015-01-29 16:00:05 +01:00 committed by Ulf Hansson
parent 934f1f4833
commit 3f656a168c
1 changed files with 4 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
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@ -12,6 +12,10 @@ Optional properties:
at initialization and prior we start the power up procedure of the card.
They will be de-asserted right after the power has been provided to the
card.
- clocks : Must contain an entry for the entry in clock-names.
See ../clocks/clock-bindings.txt for details.
- clock-names : Must include the following entry:
"ext_clock" (External clock provided to the card).
Example: