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

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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>
This commit is contained in:
Patrick Delaunay 2018-02-07 17:19:59 +01:00 committed by Tom Rini
parent a72dd8ed95
commit 167f2c90f6
1 changed files with 6 additions and 1 deletions
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7
drivers/mmc/stm32_sdmmc2.c
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@ -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)