media: exynos-gsc: Use platform_get_irq() to get the interrupt

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq().
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/exynos-gsc/gsc-core.c

@@ -1106,9 +1106,9 @@ MODULE_DEVICE_TABLE(of, exynos_gsc_match);
 static int gsc_probe(struct platform_device *pdev)
 {
 	struct gsc_dev *gsc;
-	struct resource *res;
 	struct device *dev = &pdev->dev;
 	const struct gsc_driverdata *drv_data = of_device_get_match_data(dev);
+	int irq;
 	int ret;
 	int i;
 
@@ -1141,11 +1141,9 @@ static int gsc_probe(struct platform_device *pdev)
 	if (IS_ERR(gsc->regs))
 		return PTR_ERR(gsc->regs);
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(dev, "failed to get IRQ resource\n");
-		return -ENXIO;
-	}
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
 	for (i = 0; i < gsc->num_clocks; i++) {
 		gsc->clock[i] = devm_clk_get(dev, drv_data->clk_names[i]);
@@ -1167,8 +1165,8 @@ static int gsc_probe(struct platform_device *pdev)
 		}
 	}
 
-	ret = devm_request_irq(dev, res->start, gsc_irq_handler,
-				0, pdev->name, gsc);
+	ret = devm_request_irq(dev, irq, gsc_irq_handler,
+			       0, pdev->name, gsc);
 	if (ret) {
 		dev_err(dev, "failed to install irq (%d)\n", ret);
 		goto err_clk;