Commit 10a0ed7a authored by Shawn Lin's avatar Shawn Lin Committed by Ulf Hansson
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Documentation: mmc: addtional description for post-power-on-delay-ms 



post-power-on-delay-ms woule be reused to substitute the hard-coded 10ms
delay waiting for power supply to be stable, specificed by individual
platform/board. Default to 10ms as before, if no available.

Signed-off-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent caeffcf1

Documentation/devicetree/bindings/mmc/mmc.txt

+4 −0
Original line number Diff line number Diff line
@@ -58,6 +58,10 @@ Optional properties: 
- fixed-emmc-driver-type: for non-removable eMMC, enforce this driver type.

  The value <n> is the driver type as specified in the eMMC specification

  (table 206 in spec version 5.1).

- post-power-on-delay-ms : It was invented for MMC pwrseq-simple which could

  be referred to mmc-pwrseq-simple.txt. But now it's reused as a tunable delay

  waiting for I/O signalling and card power supply to be stable, regardless of

  whether pwrseq-simple is used. Default to 10ms if no available.



*NOTE* on CD and WP polarity. To use common for all SD/MMC host controllers line

polarity properties, we have to fix the meaning of the "normal" and "inverted"

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