On 05/11/2017 11:28 AM, Peng Fan wrote: > 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 <[email protected]> > Cc: Jaehoon Chung <[email protected]> > Cc: York Sun <[email protected]> > Cc: Stefano Babic <[email protected]>
Reviewed-by: Jaehoon Chung <[email protected]> > --- > > V3: add regulator enable > V2: include header file, fix dev_dbg > > 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 bddfe24..20f0b40 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, > _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
