[U-Boot] [PATCH 3/5] mmc: arm_pl180_mmci: add bus_width DT property support

[Jaehoon Chung]

On 10/19/2017 11:46 PM, patrice.chotard at st.com wrote:
> From: Patrice Chotard <patrice.chotard at st.com>
> 
> Allow to get "bus-width" property from device tree
> 
> Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
> ---
>  drivers/mmc/arm_pl180_mmci.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/mmc/arm_pl180_mmci.c b/drivers/mmc/arm_pl180_mmci.c
> index 61dbbfb..6ee77b1 100644
> --- a/drivers/mmc/arm_pl180_mmci.c
> +++ b/drivers/mmc/arm_pl180_mmci.c
> @@ -405,6 +405,7 @@ static int arm_pl180_mmc_probe(struct udevice *dev)
>  	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
>  	struct mmc *mmc = &pdata->mmc;
>  	struct pl180_mmc_host *host = mmc->priv;
> +	u32 bus_width;
>  	int ret;
>  
>  	strcpy(host->name, "MMC");
> @@ -417,6 +418,22 @@ static int arm_pl180_mmc_probe(struct udevice *dev)
>  	host->clock_min = 400000;
>  	host->clock_max = dev_read_u32_default(dev, "max-frequency", 48000000);
>  	host->version2 = dev_get_driver_data(dev);
> +
> +	bus_width = dev_read_u32_default(dev, "bus-width", 1);
> +	switch (bus_width) {
> +	case 8:
> +		host->caps |= MMC_MODE_8BIT;
> +		/* Hosts capable of 8-bit transfers can also do 4 bits */
> +	case 4:
> +		host->caps |= MMC_MODE_4BIT;
> +		break;
> +	case 1:
> +		break;
> +	default:
> +		dev_err(dev, "Invalid bus-width value %u\n", bus_width);

Doesn't need to return -EINVAL..It can be run with 1bit BUSWIDTH.
I think that it's enough to display the error message.

> +		return -EINVAL;
> +	}
> +
>  	ret = arm_pl180_mmci_init(host, &mmc);
>  	if (ret) {
>  		dev_err(dev, "arm_pl180_mmci init failed\n");
>