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Documentation: mmc: addtional description for post-power-on-delay-ms

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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: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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Shawn Lin 2018-05-08 09:04:19 +08:00 committed by Ulf Hansson
parent caeffcf1b2
commit 10a0ed7a94
1 changed files with 4 additions and 0 deletions
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4
Documentation/devicetree/bindings/mmc/mmc.txt
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@ -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"