On 10/19/2017 11:46 PM, patrice.chot...@st.com wrote:
> From: Patrice Chotard <patrice.chot...@st.com>
>
> Allow to get "bus-width" property from device tree
>
> Signed-off-by: Patrice Chotard <patrice.chot...@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");
>
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