From: Patrick Delaunay <patrick.delau...@st.com>
This patch adds "st,pin-ckin" support to activate sdmmc_ckin feature.
When using an external driver (a voltage switch transceiver),
it's advised to select SDMMC_CKIN feedback clock input to sample
the received data.
Signed-off-by: Patrick Delaunay <patrick.delau...@st.com>
Signed-off-by: Patrice Chotard <patrice.chot...@st.com>
---
drivers/mmc/stm32_sdmmc2.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/stm32_sdmmc2.c b/drivers/mmc/stm32_sdmmc2.c
index 0fe6808e5dc8..05b421ddd112 100644
--- a/drivers/mmc/stm32_sdmmc2.c
+++ b/drivers/mmc/stm32_sdmmc2.c
@@ -72,7 +72,10 @@ struct stm32_sdmmc2_ctx {
#define SDMMC_CLKCR_HWFC_EN BIT(17)
#define SDMMC_CLKCR_DDR BIT(18)
#define SDMMC_CLKCR_BUSSPEED BIT(19)
-#define SDMMC_CLKCR_SELCLKRX GENMASK(21, 20)
+#define SDMMC_CLKCR_SELCLKRX_MASK GENMASK(21, 20)
+#define SDMMC_CLKCR_SELCLKRX_CK 0
+#define SDMMC_CLKCR_SELCLKRX_CKIN BIT(20)
+#define SDMMC_CLKCR_SELCLKRX_FBCK BIT(21)
/* SDMMC_CMD register */
#define SDMMC_CMD_CMDINDEX GENMASK(5, 0)
@@ -535,6 +538,8 @@ static int stm32_sdmmc2_probe(struct udevice *dev)
priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
if (dev_read_bool(dev, "st,dirpol"))
priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
+ if (dev_read_bool(dev, "st,pin-ckin"))
+ priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;
ret = clk_get_by_index(dev, 0, &priv->clk);
if (ret)
--
1.9.1
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