drm/rockchip: add CONFIG_OF dependency for lvds

Build-testing on randconfig kernels revealed a dependency in the
newly added lvds sub-driver:

drivers/gpu/drm/rockchip/rockchip_lvds.c: In function 'rockchip_lvds_bind':
drivers/gpu/drm/rockchip/rockchip_lvds.c:380:24: error: 'struct drm_bridge' has no member named 'of_node'
   remote = lvds->bridge->of_node;

We could work around that in the code, adding a Kconfig dependency
seems easier.

Fixes: 34cc0aa25456 ("drm/rockchip: Add support for Rockchip Soc LVDS")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20171106135852.1355487-1-arnd@arndb.de

diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
index 3c70c62..0ccc762 100644 (file)
--- a/drivers/gpu/drm/rockchip/Kconfig
+++ b/drivers/gpu/drm/rockchip/Kconfig
@@ -60,7 +60,7 @@ config ROCKCHIP_INNO_HDMI
 config ROCKCHIP_LVDS
        bool "Rockchip LVDS support"
        depends on DRM_ROCKCHIP
-       depends on PINCTRL
+       depends on PINCTRL && OF
        help
          Choose this option to enable support for Rockchip LVDS controllers.
          Rockchip rk3288 SoC has LVDS TX Controller can be used, and it