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>
Reviewed-by: Jaehoon Chung <jh80.ch...@samsung.com>
---
V4: add review tag
V3: Include regulator header file, fix dev_dbg usage
V2: none
drivers/mmc/fsl_esdhc.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index aa08102..5e320e0 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -16,6 +16,7 @@
#include <hwconfig.h>
#include <mmc.h>
#include <part.h>
+#include <power/regulator.h>
#include <malloc.h>
#include <fsl_esdhc.h>
#include <fdt_support.h>
@@ -968,6 +969,7 @@ 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 +1007,29 @@ 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(dev, "no vqmmc-supply\n");
+ } else {
+ ret = regulator_set_enable(vqmmc_dev, true);
+ if (ret) {
+ dev_err(dev, "fail to enable vqmmc-supply\n");
+ return ret;
+ }
+
+ 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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