mmc: stm32: sdmmc2: add support for st, pin-ckinsdmmc_ckin

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.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

diff --git a/drivers/mmc/stm32_sdmmc2.c b/drivers/mmc/stm32_sdmmc2.c
index 3e578359e02aadeef4cff05f7a5742eaf91843b1..f5b21dd097d6ed50ce3194903682d414abb9f13b 100644 (file)
--- 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)