DRM: ingenic: Use devm_platform_ioremap_resource

Simplify a bit the probe function by using the newly introduced
devm_platform_ioremap_resource(), instead of having to call
platform_get_resource() followed by devm_ioremap_resource().

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190627182114.27299-1-paul@crapouillou.net
# *** extracted tags ***
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

drivers/gpu/drm/ingenic/ingenic-drm.c

@@ -580,7 +580,6 @@ static int ingenic_drm_probe(struct platform_device *pdev)
 	struct drm_bridge *bridge;
 	struct drm_panel *panel;
 	struct drm_device *drm;
-	struct resource *mem;
 	void __iomem *base;
 	long parent_rate;
 	int ret, irq;
@@ -614,8 +613,7 @@ static int ingenic_drm_probe(struct platform_device *pdev)
 	drm->mode_config.max_height = 600;
 	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	base = devm_ioremap_resource(dev, mem);
+	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base)) {
 		dev_err(dev, "Failed to get memory resource");
 		return PTR_ERR(base);