drm/panel: add backlight dependency for sitronix-st7789v

Without the dependency, we run into a link error:

drivers/gpu/drm/panel/panel-sitronix-st7789v.o: In function `st7789v_probe':
panel-sitronix-st7789v.c:(.text.st7789v_probe+0xc0): undefined reference to `of_find_backlight_by_node'

Fixes: 7142afb3a186 ("drm/panel: Add driver for sitronix ST7789V LCD controller")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170419180326.303994-1-arnd@arndb.de

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 6350a263539ef5f9f63da985febe285b3ee74599..d84a031fae247db1787d9143eb54767381a42c33 100644 (file)
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -112,6 +112,7 @@ config DRM_PANEL_SHARP_LS043T1LE01
 config DRM_PANEL_SITRONIX_ST7789V
        tristate "Sitronix ST7789V panel"
        depends on OF && SPI
+       depends on BACKLIGHT_CLASS_DEVICE
        help
          Say Y here if you want to enable support for the Sitronix
          ST7789V controller for 240x320 LCD panels