mci: mmci: add DT support

Just adds the minimal implementation to fill platform_data from
the DT properties with Linux binding. As all MMC controllers are
supposed to support at least the 3.3V signalling level, this gets
exposed regardless of the platform data, just as other controller
drivers in Barebox handle this.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 36 insertions, 3 deletions

diff --git a/drivers/mci/mmci.c b/drivers/mci/mmci.c
index 7489ee03a1..f45557d4f7 100644
--- a/drivers/mci/mmci.c
+++ b/drivers/mci/mmci.c
@@ -532,9 +532,37 @@ static void mci_set_ios(struct mci_host *mci, struct mci_ios *ios)
 	udelay(CLK_CHANGE_DELAY);
 }
 
+static int mmci_of_parse(struct device_node *np,
+			 struct mmci_platform_data *plat)
+{
+	if (!IS_ENABLED(CONFIG_OFDEVICE))
+		return 0;
+
+	if (of_get_property(np, "st,sig-dir-dat0", NULL))
+		plat->sigdir |= MCI_ST_DATA0DIREN;
+	if (of_get_property(np, "st,sig-dir-dat2", NULL))
+		plat->sigdir |= MCI_ST_DATA2DIREN;
+	if (of_get_property(np, "st,sig-dir-dat31", NULL))
+		plat->sigdir |= MCI_ST_DATA31DIREN;
+	if (of_get_property(np, "st,sig-dir-dat74", NULL))
+		plat->sigdir |= MCI_ST_DATA74DIREN;
+	if (of_get_property(np, "st,sig-dir-cmd", NULL))
+		plat->sigdir |= MCI_ST_CMDDIREN;
+	if (of_get_property(np, "st,sig-pin-fbclk", NULL))
+		plat->sigdir |= MCI_ST_FBCLKEN;
+
+	if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
+		plat->capabilities |= MMC_CAP_MMC_HIGHSPEED;
+	if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
+		plat->capabilities |= MMC_CAP_SD_HIGHSPEED;
+
+	return 0;
+}
+
 static int mmci_probe(struct amba_device *dev, const struct amba_id *id)
 {
 	struct device_d *hw_dev = &dev->dev;
+	struct device_node *np = hw_dev->device_node;
 	struct mmci_platform_data *plat = hw_dev->platform_data;
 	struct variant_data *variant = id->data;
 	u32 sdi_u32;
@@ -542,11 +570,16 @@ static int mmci_probe(struct amba_device *dev, const struct amba_id *id)
 	struct clk *clk;
 	int ret;
 
-	if (!plat) {
-		dev_err(hw_dev, "missing platform data\n");
+	if (!plat && !np) {
+		dev_err(hw_dev, "missing platform data or DT node\n");
 		return -EINVAL;
 	}
 
+	if (!plat)
+		plat = xzalloc(sizeof(*plat));
+
+	mmci_of_parse(np, plat);
+
 	host = xzalloc(sizeof(*host));
 
 	host->base = amba_get_mem_region(dev);
@@ -625,7 +658,7 @@ static int mmci_probe(struct amba_device *dev, const struct amba_id *id)
 	host->mci.max_req_size = (1 << variant->datalength_bits) - 1;
 
 	host->mci.host_caps = plat->capabilities;
-	host->mci.voltages = plat->ocr_mask;
+	host->mci.voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | plat->ocr_mask;
 
 	mci_register(&host->mci);