drm/rockchip: Make use of the helper function devm_platform_ioremap_resource()

Use the devm_platform_ioremap_resource() helper instead of
calling platform_get_resource() and devm_ioremap_resource()
separately
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210831135721.4726-1-caihuoqing@baidu.com

drivers/gpu/drm/rockchip/cdn-dp-core.c

@@ -697,7 +697,6 @@ static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 	struct device *dev = dp->dev;
 	struct device_node *np = dev->of_node;
 	struct platform_device *pdev = to_platform_device(dev);
-	struct resource *res;
 
 	dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 	if (IS_ERR(dp->grf)) {
@@ -705,8 +704,7 @@ static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
 		return PTR_ERR(dp->grf);
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dp->regs = devm_ioremap_resource(dev, res);
+	dp->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(dp->regs)) {
 		DRM_DEV_ERROR(dev, "ioremap reg failed\n");
 		return PTR_ERR(dp->regs);

drivers/gpu/drm/rockchip/inno_hdmi.c

@@ -810,7 +810,6 @@ static int inno_hdmi_bind(struct device *dev, struct device *master,
 	struct platform_device *pdev = to_platform_device(dev);
 	struct drm_device *drm = data;
 	struct inno_hdmi *hdmi;
-	struct resource *iores;
 	int irq;
 	int ret;
 
@@ -821,8 +820,7 @@ static int inno_hdmi_bind(struct device *dev, struct device *master,
 	hdmi->dev = dev;
 	hdmi->drm_dev = drm;
 
-	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	hdmi->regs = devm_ioremap_resource(dev, iores);
+	hdmi->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(hdmi->regs))
 		return PTR_ERR(hdmi->regs);
 

drivers/gpu/drm/rockchip/rockchip_lvds.c

@@ -440,11 +440,9 @@ struct drm_encoder_helper_funcs px30_lvds_encoder_helper_funcs = {
 static int rk3288_lvds_probe(struct platform_device *pdev,
 			     struct rockchip_lvds *lvds)
 {
-	struct resource *res;
 	int ret;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	lvds->regs = devm_ioremap_resource(lvds->dev, res);
+	lvds->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(lvds->regs))
 		return PTR_ERR(lvds->regs);