Handle vqmmc supply. Some boards have a fixed I/O voltage
at 1.8V for emmc, so the usdhc also needs to be configured
as 1.8V by setting VSELECT bit. The vs18_enable is the one
that used to checking whether setting VSELECT or not in
the driver. So if vqmmc supply is 1.8V, set vs18_enable,
the driver will set VSELECT.
Signed-off-by: Peng Fan <peng....@nxp.com>
Cc: Jaehoon Chung <jh80.ch...@samsung.com>
Cc: York Sun <york....@nxp.com>
Cc: Stefano Babic <sba...@denx.de>
---
drivers/mmc/fsl_esdhc.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index bddfe24..9ebde32 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -968,6 +968,7 @@ static int fsl_esdhc_probe(struct udevice *dev)
struct fsl_esdhc_priv *priv = dev_get_priv(dev);
const void *fdt = gd->fdt_blob;
int node = dev_of_offset(dev);
+ struct udevice *vqmmc_dev;
fdt_addr_t addr;
unsigned int val;
int ret;
@@ -1005,6 +1006,23 @@ static int fsl_esdhc_probe(struct udevice *dev)
if (ret)
priv->wp_enable = 0;
#endif
+
+ priv->vs18_enable = 0;
+
+#ifdef CONFIG_DM_REGULATOR
+ /*
+ * If emmc I/O has a fixed voltage at 1.8V, this must be provided,
+ * otherwise, emmc will work abnormally.
+ */
+ ret = device_get_supply_regulator(dev, "vqmmc-supply", &vqmmc_dev);
+ if (ret) {
+ dev_dbg("no vqmmc-supply\n");
+ } else {
+ if (regulator_get_value(vqmmc_dev) == 1800000)
+ priv->vs18_enable = 1;
+ }
+#endif
+
/*
* TODO:
* Because lack of clk driver, if SDHC clk is not enabled,
--
2.6.2
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