[PATCH 1/5] drm/exynos/exynos7_drm_decon: Use platform_get_irq_byname() to get the interrupt

[Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>]

platform_get_resource_byname(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 bypassed the hierarchical setup and messed up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq_byname().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/gpu/drm/exynos/exynos7_drm_decon.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
index 12571ac45540..c04264f70ad1 100644
--- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
@@ -678,7 +678,6 @@ static int decon_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct decon_context *ctx;
 	struct device_node *i80_if_timings;
-	struct resource *res;
 	int ret;
 
 	if (!dev->of_node)
@@ -728,16 +727,11 @@ static int decon_probe(struct platform_device *pdev)
 		goto err_iounmap;
 	}
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
-					   ctx->i80_if ? "lcd_sys" : "vsync");
-	if (!res) {
-		dev_err(dev, "irq request failed.\n");
-		ret = -ENXIO;
+	ret =  platform_get_irq_byname(pdev, ctx->i80_if ? "lcd_sys" : "vsync");
+	if (ret < 0)
 		goto err_iounmap;
-	}
 
-	ret = devm_request_irq(dev, res->start, decon_irq_handler,
-							0, "drm_decon", ctx);
+	ret = devm_request_irq(dev, ret, decon_irq_handler, 0, "drm_decon", ctx);
 	if (ret) {
 		dev_err(dev, "irq request failed.\n");
 		goto err_iounmap;
-- 
2.17.1