usb: gadget: gr_udc: Use platform_get_irq instead of irq_of_parse_and_map

Use platform_get_irq as no mapping needs to be done. No functional difference
for SPARC which is the typical environment for the driver though. Suggested by
Mark Rutland.
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/gr_udc.c

@@ -2108,20 +2108,22 @@ static int gr_probe(struct platform_device *pdev)
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
 
-	dev->irq = irq_of_parse_and_map(dev->dev->of_node, 0);
-	if (!dev->irq) {
+	dev->irq = platform_get_irq(pdev, 0);
+	if (dev->irq <= 0) {
 		dev_err(dev->dev, "No irq found\n");
 		return -ENODEV;
 	}
 
 	/* Some core configurations has separate irqs for IN and OUT events */
-	dev->irqi = irq_of_parse_and_map(dev->dev->of_node, 1);
-	if (dev->irqi) {
-		dev->irqo = irq_of_parse_and_map(dev->dev->of_node, 2);
-		if (!dev->irqo) {
+	dev->irqi = platform_get_irq(pdev, 1);
+	if (dev->irqi > 0) {
+		dev->irqo = platform_get_irq(pdev, 2);
+		if (dev->irqo <= 0) {
 			dev_err(dev->dev, "Found irqi but not irqo\n");
 			return -ENODEV;
 		}
+	} else {
+		dev->irqi = 0;
 	}
 
 	dev->gadget.name = driver_name;