linux-kernel - [PATCH] drm/panel: ld9040: add backlight Kconfig dependency

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Message-Id: <20230724121736.1293270-1-arnd@kernel.org>
Date:   Mon, 24 Jul 2023 14:17:05 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        Paul Cercueil <paul@...pouillou.net>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/panel: ld9040: add backlight Kconfig dependency

From: Arnd Bergmann <arnd@...db.de>

The driver now uses the backlight interface, which breaks when that
is disabled:

ld.lld: error: undefined symbol: devm_backlight_device_register

Enforce the necessary Kconfig dependency to avoid this.

Fixes: c2268daa65fb4 ("drm/panel: ld9040: Register a backlight device")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/panel/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index e8c9f4613a4b4..b097b2507ac5b 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -300,6 +300,7 @@ config DRM_PANEL_LEADTEK_LTK500HD1829
 config DRM_PANEL_SAMSUNG_LD9040
 	tristate "Samsung LD9040 RGB/SPI panel"
 	depends on OF && SPI
+	depends on BACKLIGHT_CLASS_DEVICE
 	select VIDEOMODE_HELPERS
 
 config DRM_PANEL_LG_LB035Q02
-- 
2.39.2