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dm: mmc: fsl_esdhc: handle vqmmc supply

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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.fan@nxp.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Peng Fan 2017-06-12 17:50:54 +08:00 committed by Stefano Babic
parent 32a9179f3a
commit 4483b7eb88
1 changed files with 25 additions and 0 deletions
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25
drivers/mmc/fsl_esdhc.c
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@ -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>
@ -971,6 +972,7 @@ 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;
@ -1008,6 +1010,29 @@ 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,