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mmc: sdhci-esdhc-imx: add tuning-step setting support

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tuning-step is the delay cell steps in tuning procedure. The default value
of tuning-step is 1. Some boards or cards need another value to pass the
tuning procedure. For example, imx7d-sdb board 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.

Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
Acked-by: Dong Aisheng <aisheng.dong@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Haibo Chen
2015-08-11 19:38:27 +08:00
committed by Ulf Hansson
parent 28b07674f2
commit d407e30ba6
2 changed files with 10 additions and 0 deletions
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include/linux/platform_data/mmc-esdhc-imx.h
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@@ -45,5 +45,6 @@ struct esdhc_platform_data {
int max_bus_width;
bool support_vsel;
unsigned int delay_line;
unsigned int tuning_step; /* The delay cell steps in tuning procedure */
};
#endif /* __ASM_ARCH_IMX_ESDHC_H */