[U-Boot] [RFC 2/2] dm: mmc: implement pwrup function

[Peng Fan]

If vmmc-supply property is provided, then enable it.
If vmmc-supply is not provided, just ignore it.
For now, only fixed regulator is supported.

In device tree:
"
                reg_sd1_vmmc: regulator@1 {
                        compatible = "regulator-fixed";
                        regulator-name = "VSD_3V3";
                        regulator-min-microvolt = <3300000>;
                        regulator-max-microvolt = <3300000>;
                        gpio = <&gpio1 9 GPIO_ACTIVE_HIGH>;
                        enable-active-high;
                };

&usdhc1 {
        pinctrl-names = "default", "state_100mhz", "state_200mhz";
        pinctrl-0 = <&pinctrl_usdhc1>;
        pinctrl-1 = <&pinctrl_usdhc1_100mhz>;
        pinctrl-2 = <&pinctrl_usdhc1_200mhz>;
        cd-gpios = <&gpio1 19 GPIO_ACTIVE_LOW>;
        keep-power-in-suspend;
        enable-sdio-wakeup;
        vmmc-supply = <&reg_sd1_vmmc>;
        status = "okay";
};
"

Signed-off-by: Peng Fan <van.free...@gmail.com>
Cc: Pantelis Antoniou <pa...@antoniou-consulting.com>
Cc: Simon Glass <s...@chromium.org>
Cc: Eric Nelson <e...@nelint.com>
Cc: York Sun <york....@nxp.com>
Cc: Stefano Babic <sba...@denx.de>
Cc: Fabio Estevam <fabio.este...@nxp.com>
---
 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 e657bd0..33a7efb 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -23,6 +23,7 @@
 #include <dm.h>
 #include <asm/arch/clock.h>
 #include <asm-generic/gpio.h>
+#include <power/regulator.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -671,6 +672,29 @@ static int esdhc_getcd(struct mmc *mmc)
        return timeout > 0;
 }
 
+static int esdhc_pwrup(struct mmc *mmc)
+{
+#ifdef CONFIG_DM_MMC
+       struct fsl_esdhc_priv *priv = mmc->priv;
+       struct udevice *vmmc_supply;
+       int ret;
+
+       ret = device_get_supply_regulator(priv->dev, "vmmc-supply",
+                                         &vmmc_supply);
+       if (ret) {
+               debug("No vmmc supply\n");
+               return 0;
+       }
+
+       ret = regulator_set_enable(vmmc_supply, true);
+       if (ret) {
+               puts("Error enabling VMMC supply\n");
+               return ret;
+       }
+#endif
+       return 0;
+}
+
 static void esdhc_reset(struct fsl_esdhc *regs)
 {
        unsigned long timeout = 100; /* wait max 100 ms */
@@ -690,6 +714,7 @@ static const struct mmc_ops esdhc_ops = {
        .set_ios        = esdhc_set_ios,
        .init           = esdhc_init,
        .getcd          = esdhc_getcd,
+       .pwrup          = esdhc_pwrup,
 };
 
 static int fsl_esdhc_cfg_to_priv(struct fsl_esdhc_cfg *cfg,
-- 
2.6.2

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