diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 7d9e25a6507b..e077c55c21ab 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -252,7 +252,10 @@ DTC ?= $(objtree)/scripts/dtc/dtc
 
 # Disable noisy checks by default
 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
-DTC_FLAGS += -Wno-unit_address_vs_reg \
+DTC_FLAGS += -Wno-unit_address_vs_reg
+endif
+ifeq ($(DTC_EXT),)
+DTC_FLAGS += -Wno-simple_bus_reg \
 	-Wno-unit_address_format \
 	-Wno-avoid_unnecessary_addr_size \
 	-Wno-alias_paths \
@@ -287,6 +290,12 @@ cmd_dt_S_dtb=						\
 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 	$(call if_changed,dt_S_dtb)
 
+ifneq ($(DTC_EXT),)
+DTC = $(DTC_EXT)
+else
+DTC = $(objtree)/scripts/dtc/dtc
+endif
+
 quiet_cmd_dtc = DTC     $@
 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 82160808765c..823892e2ebf3 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -2,7 +2,9 @@
 # scripts/dtc makefile
 
 hostprogs-$(CONFIG_DTC) := dtc
+ifeq ($(DTC_EXT),)
 always		:= $(hostprogs-y)
+endif
 
 dtc-objs	:= dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
 		   srcpos.o checks.o util.o