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

[patrice.chotard at st.com]

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);
+		return -EINVAL;
+	}
+
 	ret = arm_pl180_mmci_init(host, &mmc);
 	if (ret) {
 		dev_err(dev, "arm_pl180_mmci init failed\n");
-- 
1.9.1