[PATCH v3 2/6] mmc: sdhci-esdhc-imx: add tuning-step seting support

On Mi, 2015-07-29 at 17:03 +0800, Haibo Chen wrote:

tuning-step is the delay cell steps in tuning procedure. The default
value of tuning-step is 1. For imx6 series usdhc, tuning procedure can
be passed when the tuning-step value is 1. But imx7d usdhc need the
tuning-step value as 2, otherwise it can't pass the tuning procedure.

So this patch add the tuning-step setting in driver, so that user can
set the tuning-step value in dts.

From your description, the correct tuning-step value only depends on the

SoC. Why not derive it from the compatible string?

Regards,
Jan L?bbe
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