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

[Dong Aisheng]

On Thu, Jul 30, 2015 at 06:25:06PM +0200, Jan Lübbe wrote:
> 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?
> 

'tuning-step' actually depends on board and card.
The commit message should be reformed a bit.

Regards
Dong Aisheng

> Regards,
> Jan Lübbe
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