drm: panel/simple: add backlight dependency
The simple panel code uses the backlight interface to
find a device, which fails when backlight is disabled:
drivers/built-in.o: In function `panel_simple_platform_probe':
:(.text+0xd3c48): undefined reference to `of_find_backlight_by_node'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Dave Airlie <airlied@gmail.com>
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 8450605..d845837 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -10,6 +10,7 @@
config DRM_PANEL_SIMPLE
tristate "support for simple panels"
depends on OF
+ depends on BACKLIGHT_CLASS_DEVICE
help
DRM panel driver for dumb panels that need at most a regulator and
a GPIO to be powered up. Optionally a backlight can be attached so