dt-bindings: mmc: sprd: Add another optional clock documentation
For some Spreadtrum platforms like SC9860 platform, we should enable another gate clock '2x_enable' to make the SD host controller work well. Thus add documentation for this optional clock. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -14,6 +14,7 @@ Required properties:
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- clock-names: Should contain the following:
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"sdio" - SDIO source clock (required)
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"enable" - gate clock which used for enabling/disabling the device (required)
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"2x_enable" - gate clock controlling the device for some special platforms (optional)
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Optional properties:
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- assigned-clocks: the same with "sdio" clock
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