media: s5p-mfc: 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>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/s5p-mfc/s5p_mfc.c

@@ -1268,7 +1268,6 @@ static int s5p_mfc_probe(struct platform_device *pdev)
 {
 	struct s5p_mfc_dev *dev;
 	struct video_device *vfd;
-	struct resource *res;
 	int ret;
 
 	pr_debug("%s++\n", __func__);
@@ -1294,12 +1293,10 @@ static int s5p_mfc_probe(struct platform_device *pdev)
 	if (IS_ERR(dev->regs_base))
 		return PTR_ERR(dev->regs_base);
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "failed to get irq resource\n");
-		return -ENOENT;
-	}
-	dev->irq = res->start;
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+	dev->irq = ret;
 	ret = devm_request_irq(&pdev->dev, dev->irq, s5p_mfc_irq,
 					0, pdev->name, dev);
 	if (ret) {