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mmc: fsl_esdhc: introduce vs18_enable for 1.8V fix I/O

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When using eMMC with 1.8V I/O, the VSELECT bit need to be set in
the USDHC controller when init.

This patch adds a parameter "vs18_enable" in fsl_esdhc_cfg
structure and priv data, so each controller can have different
settings.

We could not use CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT, it has problem
that it will apply to all USDHC controllers and it only set the 1.8V
at init phase. So if user does not select to the eMMC device,
the voltage on the I/O pins are not correct.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Peng Fan
2017-06-12 17:50:53 +08:00
committed by Stefano Babic
parent 15a91651bf
commit 32a9179f3a
2 changed files with 10 additions and 0 deletions
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1
include/fsl_esdhc.h
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@@ -178,6 +178,7 @@ struct fsl_esdhc_cfg {
u32 sdhc_clk;
u8 max_bus_width;
int wp_enable;
int vs18_enable; /* Use 1.8V if set to 1 */
struct mmc_config cfg;
};