From 8cb523f1069ad5a89afb53dcb603644b4b599ba9 Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@ravnborg.org>
Date: Thu, 14 May 2020 21:09:45 +0200
Subject: drm/tilcdc: use devm_of_find_backlight
Git-commit: a18dc7401ab5c86de38f64ee6301a6bd3757f017
Patch-mainline: v5.9-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

Look up backlight device using devm_of_find_backlight().
This simplifies the code and prevents us from hardcoding
the node name in the driver.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Jyri Sarha <jsarha@ti.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200514191001.457441-3-sam@ravnborg.org
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/tilcdc/tilcdc_panel.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_panel.c b/drivers/gpu/drm/tilcdc/tilcdc_panel.c
index 12823d60c4e8..b207b2f19d42 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_panel.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_panel.c
@@ -299,7 +299,8 @@ static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 
 static int panel_probe(struct platform_device *pdev)
 {
-	struct device_node *bl_node, *node = pdev->dev.of_node;
+	struct device_node *node = pdev->dev.of_node;
+	struct backlight_device *backlight;
 	struct panel_module *panel_mod;
 	struct tilcdc_module *mod;
 	struct pinctrl *pinctrl;
@@ -315,16 +316,10 @@ static int panel_probe(struct platform_device *pdev)
 	if (!panel_mod)
 		return -ENOMEM;
 
-	bl_node = of_parse_phandle(node, "backlight", 0);
-	if (bl_node) {
-		panel_mod->backlight = of_find_backlight_by_node(bl_node);
-		of_node_put(bl_node);
-
-		if (!panel_mod->backlight)
-			return -EPROBE_DEFER;
-
-		dev_info(&pdev->dev, "found backlight\n");
-	}
+	backlight = devm_of_find_backlight(&pdev->dev);
+	if (IS_ERR(backlight))
+		return PTR_ERR(backlight);
+	panel_mod->backlight = backlight;
 
 	panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 							 GPIOD_OUT_LOW);
-- 
2.29.2