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

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

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@xxxxxxxx>
---
 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