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dt-bindings: rockchip-dw-mshc: add optional rockchip, desired-num-phases

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By default, dw_mmc-rockchip will execute tuning for each degree.
So we won't miss every point of the good sample windows. However,
probably the phases are linear inside the good sample window.
Actually we don't need to do tuning for each degree so that we could
save some time, for instance, probe the driver or resume from S3.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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Shawn Lin 2017-05-16 14:28:53 +08:00 committed by Ulf Hansson
parent 2fe35968fe
commit fca0c33003
1 changed files with 4 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
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@ -32,6 +32,10 @@ Optional Properties:
probing, low speeds or in case where all phases work at tuning time.
If not specified 0 deg will be used.
* rockchip,desired-num-phases: The desired number of times that the host
execute tuning when needed. If not specified, the host will do tuning
for 360 times, namely tuning for each degree.
Example:
rkdwmmc0@12200000 {