drm/panel: sharp-ls043t1le01: use drm_panel backlight support

Use the backlight support in drm_panel to simplify the driver
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-22-sam@ravnborg.org

drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c

@@ -7,7 +7,6 @@
  * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
  */
 
-#include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
@@ -25,7 +24,6 @@ struct sharp_nt_panel {
 	struct drm_panel base;
 	struct mipi_dsi_device *dsi;
 
-	struct backlight_device *backlight;
 	struct regulator *supply;
 	struct gpio_desc *reset_gpio;
 
@@ -107,8 +105,6 @@ static int sharp_nt_panel_disable(struct drm_panel *panel)
 	if (!sharp_nt->enabled)
 		return 0;
 
-	backlight_disable(sharp_nt->backlight);
-
 	sharp_nt->enabled = false;
 
 	return 0;
@@ -190,8 +186,6 @@ static int sharp_nt_panel_enable(struct drm_panel *panel)
 	if (sharp_nt->enabled)
 		return 0;
 
-	backlight_enable(sharp_nt->backlight);
-
 	sharp_nt->enabled = true;
 
 	return 0;
@@ -244,6 +238,7 @@ static const struct drm_panel_funcs sharp_nt_panel_funcs = {
 static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
 {
 	struct device *dev = &sharp_nt->dsi->dev;
+	int ret;
 
 	sharp_nt->mode = &default_mode;
 
@@ -260,14 +255,13 @@ static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
 		gpiod_set_value(sharp_nt->reset_gpio, 0);
 	}
 
-	sharp_nt->backlight = devm_of_find_backlight(dev);
-
-	if (IS_ERR(sharp_nt->backlight))
-		return PTR_ERR(sharp_nt->backlight);
-
 	drm_panel_init(&sharp_nt->base, &sharp_nt->dsi->dev,
 		       &sharp_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
 
+	ret = drm_panel_of_backlight(&sharp_nt->base);
+	if (ret)
+		return ret;
+
 	return drm_panel_add(&sharp_nt->base);
 }
 
@@ -309,7 +303,7 @@ static int sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
 	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
 	int ret;
 
-	ret = sharp_nt_panel_disable(&sharp_nt->base);
+	ret = drm_panel_disable(&sharp_nt->base);
 	if (ret < 0)
 		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
 
@@ -326,7 +320,7 @@ static void sharp_nt_panel_shutdown(struct mipi_dsi_device *dsi)
 {
 	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
 
-	sharp_nt_panel_disable(&sharp_nt->base);
+	drm_panel_disable(&sharp_nt->base);
 }
 
 static const struct of_device_id sharp_nt_of_match[] = {