[U-Boot] [PATCH V3 2/4] dm: mmc: fsl_esdhc: handle vqmmc supply

[Jaehoon Chung]

On 05/11/2017 11:28 AM, Peng Fan wrote:
> 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 at nxp.com>
> Cc: Jaehoon Chung <jh80.chung at samsung.com>
> Cc: York Sun <york.sun at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>

Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

> ---
> 
> V3: add regulator enable
> V2: include header file, fix dev_dbg
> 
>  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 bddfe24..20f0b40 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,
>