drm/tidss: use devm_platform_ioremap_resource_byname

Use the devm_platform_ioremap_resource_byname() helper instead of
calling platform_get_resource_byname() and devm_ioremap_resource()
separately.
Signed-off-by: Wang Xiaojun <wangxiaojun11@huawei.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200917062958.2183496-1-wangxiaojun11@huawei.com

drivers/gpu/drm/tidss/tidss_dispc.c

@@ -2608,16 +2608,9 @@ void dispc_remove(struct tidss_device *tidss)
 static int dispc_iomap_resource(struct platform_device *pdev, const char *name,
 				void __iomem **base)
 {
-	struct resource *res;
 	void __iomem *b;
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
-	if (!res) {
-		dev_err(&pdev->dev, "cannot get mem resource '%s'\n", name);
-		return -EINVAL;
-	}
-
-	b = devm_ioremap_resource(&pdev->dev, res);
+	b = devm_platform_ioremap_resource_byname(pdev, name);
 	if (IS_ERR(b)) {
 		dev_err(&pdev->dev, "cannot ioremap resource '%s'\n", name);
 		return PTR_ERR(b);