+dtc-warning-2 += $(call dtc-option,-Wnode_name_chars_strict)
+dtc-warning-2 += $(call dtc-option,-Wproperty_name_chars_strict)
+
+dtc-warning := $(dtc-warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+dtc-warning += $(dtc-warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+dtc-warning += $(dtc-warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+
+DTC_FLAGS += $(dtc-warning)
+