usb: dwc3-exynos: Make provision for vdd regulators

From: Vivek Gautam <gautam.vivek@samsung.com>

Facilitate getting required 3.3V and 1.0V VDD supply for
DWC3 controller on Exynos.

certain perripherals will now need to ensure that,
they request VDD regulators in their drivers, and enable
them so as to make them working.

Change-Id: Ice38f24d7454110b089366fe1183cd3d36ad50bc
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Cc: Anton Tikhomirov <av.tikhomirov@samsung.com>

drivers/usb/dwc3/dwc3-exynos.c

@@ -31,6 +31,7 @@
 #include <linux/of_gpio.h>
 #include <linux/io.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/regulator/consumer.h>
 
 #include "../phy/phy-fsm-usb.h"
 
@@ -49,6 +50,8 @@ struct dwc3_exynos {
 	struct clk		*clk;
 
 	struct dwc3_exynos_rsw	rsw;
+	struct regulator        *vdd33;
+	struct regulator        *vdd10;
 };
 
 void dwc3_otg_run_sm(struct otg_fsm *fsm);
@@ -461,20 +464,46 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 
 	dwc3_exynos_rsw_init(exynos);
 
+	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
+	if (IS_ERR(exynos->vdd33)) {
+		ret = PTR_ERR(exynos->vdd33);
+		goto err2;
+	}
+	ret = regulator_enable(exynos->vdd33);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD33 supply\n");
+		goto err2;
+	}
+
+	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
+	if (IS_ERR(exynos->vdd10)) {
+		ret = PTR_ERR(exynos->vdd10);
+		goto err3;
+	}
+	ret = regulator_enable(exynos->vdd10);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD10 supply\n");
+		goto err3;
+	}
+
 	if (node) {
 		ret = of_platform_populate(node, NULL, NULL, dev);
 		if (ret) {
 			dev_err(dev, "failed to add dwc3 core\n");
-			goto err2;
+			goto err4;
 		}
 	} else {
 		dev_err(dev, "no device node, failed to add dwc3 core\n");
 		ret = -ENODEV;
-		goto err2;
+		goto err4;
 	}
 
 	return 0;
 
+err4:
+	regulator_disable(exynos->vdd10);
+err3:
+	regulator_disable(exynos->vdd33);
 err2:
 	pm_runtime_disable(&pdev->dev);
 	clk_disable_unprepare(clk);
@@ -507,6 +536,8 @@ static int dwc3_exynos_runtime_suspend(struct device *dev)
 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 
 	dev_dbg(dev, "%s\n", __func__);
+	regulator_disable(exynos->vdd33);
+	regulator_disable(exynos->vdd10);
 
 	clk_disable(exynos->clk);
 
@@ -537,14 +568,28 @@ static int dwc3_exynos_suspend(struct device *dev)
 
 	clk_disable(exynos->clk);
 
+	regulator_disable(exynos->vdd33);
+	regulator_disable(exynos->vdd10);
+
 	return 0;
 }
 
 static int dwc3_exynos_resume(struct device *dev)
 {
 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+	int ret;
 
 	dev_dbg(dev, "%s\n", __func__);
+	ret = regulator_enable(exynos->vdd33);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD33 supply\n");
+		return ret;
+	}
+	ret = regulator_enable(exynos->vdd10);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD10 supply\n");
+		return ret;
+	}
 
 	clk_enable(exynos->clk);