This patch adds a BACKLIGHT_CLASS_DEVICE dependency to configure the
DRM_SHMOBILE. Without this patch, build system can lead to build failure.
This was observed during randconfig testing, in which DRM_SHMOBILE was
enabled w/o BACKLIGHT_CLASS_DEVICE being enabled. Following was the error:

 Building modules, stage 2.
  MODPOST 516 modules
ERROR: "backlight_device_register" [drivers/gpu/drm/shmobile/shmob-drm.ko] 
undefined!
ERROR: "backlight_device_unregister" [drivers/gpu/drm/shmobile/shmob-drm.ko] 
undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

Signed-off-by: Manjunath Goudar <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: [email protected]
Cc: [email protected]
---
 drivers/gpu/drm/shmobile/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/shmobile/Kconfig b/drivers/gpu/drm/shmobile/Kconfig
index ca498d1..eaf822e 100644
--- a/drivers/gpu/drm/shmobile/Kconfig
+++ b/drivers/gpu/drm/shmobile/Kconfig
@@ -1,6 +1,6 @@
 config DRM_SHMOBILE
        tristate "DRM Support for SH Mobile"
-       depends on DRM && (ARM || SUPERH)
+       depends on DRM && (ARM || SUPERH) && BACKLIGHT_CLASS_DEVICE
        select DRM_KMS_HELPER
        select DRM_KMS_CMA_HELPER
        select DRM_GEM_CMA_HELPER
-- 
1.7.9.5

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