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 84506053a7ca7411d88bbbfbf8d20ba6bf03ae19..d84583776d50609d846e34014a4dc94c76c0a51d 100644 (file)
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -10,6 +10,7 @@ menu "Display Panels"
 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