commit 1949d484e648d9347e03dc588ac25b54fd977bb4
author Marek Vasut <marek.vasut+renesas@gmail.com> Sun Apr 08 18:14:22 2018 +0200
committer Marek Vasut <marek.vasut+renesas@gmail.com> Wed Apr 11 23:11:57 2018 +0200
tree 8743f8a2d0c90bb97fdb335217bdd0d8d7e953dd
parent abe3e956260c84ff8e39056de0b81686c4821691

mmc: renesas-sdhi: Handle 16bit IP

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

diff --git a/drivers/mmc/renesas-sdhi.c b/drivers/mmc/renesas-sdhi.c
index d6b3bfb..5215743 100644
--- a/drivers/mmc/renesas-sdhi.c
+++ b/drivers/mmc/renesas-sdhi.c
@@ -41,6 +41,19 @@
 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);
 }