[U-Boot] [PATCH v2 26/26] dm: mmc: Add a library function to parse generic dt binding

[Jaehoon Chung]

On 09/21/2017 11:30 PM, Jean-Jacques Hiblot wrote:
> From: Kishon Vijay Abraham I <kishon at ti.com>
> 
> Add a new function to parse host controller dt node and
> set mmc_config. This function can be used by mmc controller
> drivers to set the generic mmc_config.
> This function can be extended to set other UHS mode caps
> once UHS mode support is added.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
> ---
>  drivers/mmc/mmc-uclass.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>  include/mmc.h            |  1 +
>  2 files changed, 47 insertions(+)
> 
> diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
> index 7856e0a..e30cde7 100644
> --- a/drivers/mmc/mmc-uclass.c
> +++ b/drivers/mmc/mmc-uclass.c
> @@ -120,6 +120,52 @@ int mmc_execute_tuning(struct mmc *mmc, uint opcode)
>  	return dm_mmc_execute_tuning(mmc->dev, opcode);
>  }
>  
> +int mmc_of_parse(const void *fdt, int node, struct mmc_config *cfg)
> +{
> +	int val;
> +
> +	val = fdtdec_get_int(fdt, node, "bus-width", 1);
> +
> +	switch (val) {
> +	case 0x8:
> +		cfg->host_caps |= MMC_MODE_8BIT;
> +		/* fall through */
> +	case 0x4:
> +		cfg->host_caps |= MMC_MODE_4BIT;
> +		/* fall through */
> +	case 0x1:
> +		cfg->host_caps |= MMC_MODE_1BIT;
> +		break;
> +	default:
> +		printf("error: %s invalid bus-width property %d\n",
> +		       fdt_get_name(fdt, node, NULL), val);

I guess it can be set to 1-bit by default and just display message about invalid bus-width property.

> +		return -ENOENT;
> +	}
> +
> +	cfg->f_max = fdtdec_get_int(fdt, node, "max-frequency", 52000000);
> +
> +	if (fdtdec_get_bool(fdt, node, "cap-sd-highspeed"))
> +		cfg->host_caps |= MMC_CAP(SD_HS);
> +	if (fdtdec_get_bool(fdt, node, "cap-mmc-highspeed"))
> +		cfg->host_caps |= MMC_CAP(MMC_HS);
> +	if (fdtdec_get_bool(fdt, node, "sd-uhs-sdr12"))
> +		cfg->host_caps |= MMC_CAP(UHS_SDR12);
> +	if (fdtdec_get_bool(fdt, node, "sd-uhs-sdr25"))
> +		cfg->host_caps |= MMC_CAP(UHS_SDR25);
> +	if (fdtdec_get_bool(fdt, node, "sd-uhs-sdr50"))
> +		cfg->host_caps |= MMC_CAP(UHS_SDR50);
> +	if (fdtdec_get_bool(fdt, node, "sd-uhs-sdr104"))
> +		cfg->host_caps |= MMC_CAP(UHS_SDR104);
> +	if (fdtdec_get_bool(fdt, node, "sd-uhs-ddr50"))
> +		cfg->host_caps |= MMC_CAP(UHS_DDR50);
> +	if (fdtdec_get_bool(fdt, node, "mmc-ddr-1_8v"))
> +		cfg->host_caps |= MMC_CAP(MMC_DDR_52);
> +	if (fdtdec_get_bool(fdt, node, "mmc-hs200-1_8v"))
> +		cfg->host_caps |= MMC_CAP(MMC_HS_200);

Don't need to check about 1.2v?

> +
> +	return 0;
> +}
> +
>  struct mmc *mmc_get_mmc_dev(struct udevice *dev)
>  {
>  	struct mmc_uclass_priv *upriv;
> diff --git a/include/mmc.h b/include/mmc.h
> index 79be6b4..6230a32 100644
> --- a/include/mmc.h
> +++ b/include/mmc.h
> @@ -651,6 +651,7 @@ int mmc_unbind(struct udevice *dev);
>  int mmc_initialize(bd_t *bis);
>  int mmc_init(struct mmc *mmc);
>  int mmc_send_tuning(struct mmc *mmc, u32 opcode, int *cmd_error);
> +int mmc_of_parse(const void *fdt, int node, struct mmc_config *cfg);
>  int mmc_read(struct mmc *mmc, u64 src, uchar *dst, int size);
>  
>  /**
>