usb: phy: omap-usb3: Don't use omap_get_control_dev()

omap_get_control_dev() is being deprecated as it doesn't support
multiple instances. As control device is present only from OMAP4
onwards which supports DT only, we use phandles to get the
reference to the control device.

As we don't support non-DT boot, we just bail out on probe
if device node is not present.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/phy/phy-omap-usb3.c

@@ -26,6 +26,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/delay.h>
 #include <linux/usb/omap_control_usb.h>
+#include <linux/of_platform.h>
 
 #define	PLL_STATUS		0x00000004
 #define	PLL_GO			0x00000008
@@ -196,8 +197,14 @@ static int omap_usb3_init(struct usb_phy *x)
 
 static int omap_usb3_probe(struct platform_device *pdev)
 {
-	struct omap_usb			*phy;
-	struct resource			*res;
+	struct omap_usb *phy;
+	struct resource *res;
+	struct device_node *node = pdev->dev.of_node;
+	struct device_node *control_node;
+	struct platform_device *control_pdev;
+
+	if (!node)
+		return -EINVAL;
 
 	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 	if (!phy) {
@@ -239,11 +246,18 @@ static int omap_usb3_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	phy->control_dev = omap_get_control_dev();
-	if (IS_ERR(phy->control_dev)) {
-		dev_dbg(&pdev->dev, "Failed to get control device\n");
-		return -ENODEV;
+	control_node = of_parse_phandle(node, "ctrl-module", 0);
+	if (!control_node) {
+		dev_err(&pdev->dev, "Failed to get control device phandle\n");
+		return -EINVAL;
 	}
+	control_pdev = of_find_device_by_node(control_node);
+	if (!control_pdev) {
+		dev_err(&pdev->dev, "Failed to get control device\n");
+		return -EINVAL;
+	}
+
+	phy->control_dev = &control_pdev->dev;
 
 	omap_control_usb_phy_power(phy->control_dev, 0);
 	usb_add_phy_dev(&phy->phy);