net: fec: enable regulator for fec phy

If bootloader or platform initialization code does not enable the
power supply to fec phy, we need to do it in fec driver before calling
fec_reset_phy to have the phy powered on.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fec.c

@@ -49,6 +49,7 @@
 #include <linux/of_gpio.h>
 #include <linux/of_net.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/regulator/consumer.h>
 
 #include <asm/cacheflush.h>
 
@@ -1546,6 +1547,7 @@ fec_probe(struct platform_device *pdev)
 	const struct of_device_id *of_id;
 	static int dev_id;
 	struct pinctrl *pinctrl;
+	struct regulator *reg_phy;
 
 	of_id = of_match_device(fec_dt_ids, &pdev->dev);
 	if (of_id)
@@ -1632,6 +1634,16 @@ fec_probe(struct platform_device *pdev)
 	clk_prepare_enable(fep->clk_ahb);
 	clk_prepare_enable(fep->clk_ipg);
 
+	reg_phy = devm_regulator_get(&pdev->dev, "phy");
+	if (!IS_ERR(reg_phy)) {
+		ret = regulator_enable(reg_phy);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Failed to enable phy regulator: %d\n", ret);
+			goto failed_regulator;
+		}
+	}
+
 	fec_reset_phy(pdev);
 
 	ret = fec_enet_init(ndev);
@@ -1655,6 +1667,7 @@ fec_probe(struct platform_device *pdev)
 	fec_enet_mii_remove(fep);
 failed_mii_init:
 failed_init:
+failed_regulator:
 	clk_disable_unprepare(fep->clk_ahb);
 	clk_disable_unprepare(fep->clk_ipg);
 failed_pin: