+# backward compat
+ifeq ($(strip $(BACKLIGHT_CUSTOM_DRIVER)), yes)
+ BACKLIGHT_ENABLE = custom
+endif
+
+VALID_BACKLIGHT_TYPES := yes custom
+
+BACKLIGHT_ENABLE ?= no
+ifneq ($(strip $(BACKLIGHT_ENABLE)), no)
+ ifeq ($(filter $(BACKLIGHT_ENABLE),$(VALID_BACKLIGHT_TYPES)),)
+ $(error BACKLIGHT_ENABLE="$(BACKLIGHT_ENABLE)" is not a valid backlight type)
+ endif
+