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

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

quoted

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 L?bbe
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |