usb: phy: nop: Handle power supply regulator for the PHY

We use "vcc" as the supply name for the PHY's power supply.
The power supply will be enabled during .init() and disabled
during .shutdown()
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/otg/nop-usb-xceiv.c

@@ -33,11 +33,13 @@
 #include <linux/usb/nop-usb-xceiv.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
+#include <linux/regulator/consumer.h>
 
 struct nop_usb_xceiv {
 	struct usb_phy		phy;
 	struct device		*dev;
 	struct clk		*clk;
+	struct regulator	*vcc;
 };
 
 static struct platform_device *pd;
@@ -70,6 +72,11 @@ static int nop_init(struct usb_phy *phy)
 {
 	struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
 
+	if (!IS_ERR(nop->vcc)) {
+		if (regulator_enable(nop->vcc))
+			dev_err(phy->dev, "Failed to enable power\n");
+	}
+
 	if (!IS_ERR(nop->clk))
 		clk_enable(nop->clk);
 
@@ -82,6 +89,11 @@ static void nop_shutdown(struct usb_phy *phy)
 
 	if (!IS_ERR(nop->clk))
 		clk_disable(nop->clk);
+
+	if (!IS_ERR(nop->vcc)) {
+		if (regulator_disable(nop->vcc))
+			dev_err(phy->dev, "Failed to disable power\n");
+	}
 }
 
 static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
@@ -154,6 +166,12 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
 		}
 	}
 
+	nop->vcc = devm_regulator_get(&pdev->dev, "vcc");
+	if (IS_ERR(nop->vcc)) {
+		dev_dbg(&pdev->dev, "Error getting vcc regulator: %ld\n",
+					PTR_ERR(nop->vcc));
+	}
+
 	nop->dev		= &pdev->dev;
 	nop->phy.dev		= nop->dev;
 	nop->phy.label		= "nop-xceiv";