From 5e47c53739d52f90165ca391868fd09be7a8e147 Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@ravnborg.org>
Date: Sat, 7 Dec 2019 15:03:37 +0100
Subject: drm/panel: ilitek-ili9881c: use drm_panel backlight support
Git-commit: 2b33e19195cfa45887e3206d04b319f2a3724fc4
Patch-mainline: v5.6-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

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/20191207140353.23967-10-sam@ravnborg.org
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index 31e5a4e67750..f54077c216a3 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -3,7 +3,6 @@
  * Copyright (C) 2017-2018, Bootlin
  */
 
-#include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
@@ -25,7 +24,6 @@ struct ili9881c {
 	struct drm_panel	panel;
 	struct mipi_dsi_device	*dsi;
 
-	struct backlight_device *backlight;
 	struct regulator	*power;
 	struct gpio_desc	*reset;
 };
@@ -348,7 +346,6 @@ static int ili9881c_enable(struct drm_panel *panel)
 	msleep(120);
 
 	mipi_dsi_dcs_set_display_on(ctx->dsi);
-	backlight_enable(ctx->backlight);
 
 	return 0;
 }
@@ -357,7 +354,6 @@ static int ili9881c_disable(struct drm_panel *panel)
 {
 	struct ili9881c *ctx = panel_to_ili9881c(panel);
 
-	backlight_disable(ctx->backlight);
 	return mipi_dsi_dcs_set_display_off(ctx->dsi);
 }
 
@@ -423,7 +419,6 @@ static const struct drm_panel_funcs ili9881c_funcs = {
 
 static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 {
-	struct device_node *np;
 	struct ili9881c *ctx;
 	int ret;
 
@@ -448,14 +443,9 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 		return PTR_ERR(ctx->reset);
 	}
 
-	np = of_parse_phandle(dsi->dev.of_node, "backlight", 0);
-	if (np) {
-		ctx->backlight = of_find_backlight_by_node(np);
-		of_node_put(np);
-
-		if (!ctx->backlight)
-			return -EPROBE_DEFER;
-	}
+	ret = drm_panel_of_backlight(&ctx->panel);
+	if (ret)
+		return ret;
 
 	ret = drm_panel_add(&ctx->panel);
 	if (ret < 0)
@@ -475,9 +465,6 @@ static int ili9881c_dsi_remove(struct mipi_dsi_device *dsi)
 	mipi_dsi_detach(dsi);
 	drm_panel_remove(&ctx->panel);
 
-	if (ctx->backlight)
-		put_device(&ctx->backlight->dev);
-
 	return 0;
 }
 
-- 
2.28.0