diff mbox series

[U-Boot,05/15] mmc: renesas-sdhi: Handle 16bit IP

Message ID 20180409153105.13597-5-marek.vasut+renesas@gmail.com
State Accepted
Commit 7cf7ef81ed8b57194b5c4408c05963b664d44229
Delegated to: Jaehoon Chung
Headers show
Series [U-Boot,01/15] mmc: uniphier: Factor out FIFO accessors | expand

Commit Message

Marek Vasut April 9, 2018, 3:30 p.m. UTC 
The Renesas RCar Gen2 chips have a mix of 32bit and 16bit variants
of the IP. There is no DT property which allows discerning those,
so what Linux does is it checks the size of the register area and
if it is 0x100, the IP is 16bit, otherwise the IP is 32bit. Handle
the distinction the same way.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
---
 drivers/mmc/renesas-sdhi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mmc/renesas-sdhi.c b/drivers/mmc/renesas-sdhi.c
index d6b3bfbadc..521574387b 100644
--- a/drivers/mmc/renesas-sdhi.c
+++ b/drivers/mmc/renesas-sdhi.c
@@ -41,6 +41,19 @@  static const struct udevice_id renesas_sdhi_match[] = {
 static int renesas_sdhi_probe(struct udevice *dev)
 {
 	u32 quirks = dev_get_driver_data(dev);
+	struct fdt_resource reg_res;
+	DECLARE_GLOBAL_DATA_PTR;
+	int ret;
+
+	ret = fdt_get_resource(gd->fdt_blob, dev_of_offset(dev), "reg",
+			       0, &reg_res);
+	if (ret < 0) {
+		dev_err(dev, "\"reg\" resource not found, ret=%i\n", ret);
+		return ret;
+	}
+
+	if (quirks == 0 && fdt_resource_size(&reg_res) == 0x100)
+		quirks = MATSU_SD_CAP_16BIT;
 
 	return matsu_sd_probe(dev, quirks);
 }