[U-Boot] [PATCH v2 1/3] mmc: dwmmc: socfpga: Add reset ctrl to driver

[Ley Foon Tan]

Add code to reset all reset signals as in mmc DT node. A reset property is an optional feature,
so only print out a warning and do not fail if a reset property is not present.

If a reset property is discovered, then use it to deassert, thus bringing the
IP out of reset.

Signed-off-by: Ley Foon Tan <ley.foon.tan at intel.com>
---
 drivers/mmc/socfpga_dw_mmc.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/socfpga_dw_mmc.c b/drivers/mmc/socfpga_dw_mmc.c
index 9ace505..6458191 100644
--- a/drivers/mmc/socfpga_dw_mmc.c
+++ b/drivers/mmc/socfpga_dw_mmc.c
@@ -14,6 +14,7 @@
 #include <linux/libfdt.h>
 #include <linux/err.h>
 #include <malloc.h>
+#include <reset.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -34,6 +35,22 @@ struct dwmci_socfpga_priv_data {
 	unsigned int		smplsel;
 };
 
+static void socfpga_dwmci_reset(struct udevice *dev)
+{
+#ifdef CONFIG_DM_RESET
+	struct reset_ctl_bulk reset_bulk;
+	int ret;
+
+	ret = reset_get_bulk(dev, &reset_bulk);
+	if (ret) {
+	       dev_warn(dev, "Can't get reset: %d\n", ret);
+	       return;
+	}
+
+	reset_deassert_bulk(&reset_bulk);
+#endif
+}
+
 static void socfpga_dwmci_clksel(struct dwmci_host *host)
 {
 	struct dwmci_socfpga_priv_data *priv = host->priv;
@@ -110,6 +127,8 @@ static int socfpga_dwmmc_probe(struct udevice *dev)
 	struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
 	struct dwmci_host *host = &priv->host;
 
+	socfpga_dwmci_reset(dev);
+
 #ifdef CONFIG_BLK
 	dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, 400000);
 	host->mmc = &plat->mmc;
-- 
1.7.1