[PATCH 1/2] mmc: dw_mmc-rockchip: add default drv phase support

Shawn Lin
2016-05-06T09:40:48Z

This patch introduces default drv phase exposed to dts for
users to set drv phase. If default-drv-phase is not assigned,
let's set it to 180 degrees.

Signed-off-by: Shawn Lin <shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---

drivers/mmc/host/dw_mmc-rockchip.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
index 8c20b81..482eff1 100644
--- a/drivers/mmc/host/dw_mmc-rockchip.c
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
@@ -24,6 +24,7 @@ struct dw_mci_rockchip_priv_data {
struct clk *drv_clk;
struct clk *sample_clk;
int default_sample_phase;
+ int default_drv_phase;
};

static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
@@ -66,6 +67,9 @@ static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
/* Make sure we use phases which we can enumerate with */
if (!IS_ERR(priv->sample_clk))
clk_set_phase(priv->sample_clk, priv->default_sample_phase);
+
+ if (!IS_ERR(priv->drv_clk))
+ clk_set_phase(priv->drv_clk, priv->default_drv_phase);
}

#define NUM_PHASES 360
@@ -203,6 +207,10 @@ static int dw_mci_rk3288_parse_dt(struct dw_mci *host)
&priv->default_sample_phase))
priv->default_sample_phase = 0;

+ if (of_property_read_u32(np, "rockchip,default-drv-phase",
+ &priv->default_drv_phase))
+ priv->default_drv_phase = 180;
+
priv->drv_clk = devm_clk_get(host->dev, "ciu-drive");
if (IS_ERR(priv->drv_clk))
dev_dbg(host->dev, "ciu_drv not available\n");
--
2.3.7