Handle vqmmc supply. Some boards have a fixed I/O voltage at 1.8V for emmc, so the usdhc also needs to be configured as 1.8V by setting VSELECT bit. The vs18_enable is the one that used to checking whether setting VSELECT or not in the driver. So if vqmmc supply is 1.8V, set vs18_enable, the driver will set VSELECT.
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 Reviewed-by: Jaehoon Chung jh80.chung@samsung.com ---
V4: add review tag V3: Include regulator header file, fix dev_dbg usage V2: none
drivers/mmc/fsl_esdhc.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index aa08102..5e320e0 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -16,6 +16,7 @@ #include <hwconfig.h> #include <mmc.h> #include <part.h> +#include <power/regulator.h> #include <malloc.h> #include <fsl_esdhc.h> #include <fdt_support.h> @@ -968,6 +969,7 @@ static int fsl_esdhc_probe(struct udevice *dev) struct fsl_esdhc_priv *priv = dev_get_priv(dev); const void *fdt = gd->fdt_blob; int node = dev_of_offset(dev); + struct udevice *vqmmc_dev; fdt_addr_t addr; unsigned int val; int ret; @@ -1005,6 +1007,29 @@ static int fsl_esdhc_probe(struct udevice *dev) if (ret) priv->wp_enable = 0; #endif + + priv->vs18_enable = 0; + +#ifdef CONFIG_DM_REGULATOR + /* + * If emmc I/O has a fixed voltage at 1.8V, this must be provided, + * otherwise, emmc will work abnormally. + */ + ret = device_get_supply_regulator(dev, "vqmmc-supply", &vqmmc_dev); + if (ret) { + dev_dbg(dev, "no vqmmc-supply\n"); + } else { + ret = regulator_set_enable(vqmmc_dev, true); + if (ret) { + dev_err(dev, "fail to enable vqmmc-supply\n"); + return ret; + } + + if (regulator_get_value(vqmmc_dev) == 1800000) + priv->vs18_enable = 1; + } +#endif + /* * TODO: * Because lack of clk driver, if SDHC clk is not enabled,