scripts: Makefile: add support to use external DTC
Add support to use external DTC to compile device tree blobs.
Change-Id: I268d2332d5328c3b0050b35c96f91e8ef9e1f6f8
Signed-off-by: Shashank Mittal <mittals@codeaurora.org>
Signed-off-by: Puja Gupta <pujag@codeaurora.org>
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index d3d3320..f156681 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -301,6 +301,12 @@
$(obj)/%.dtb.S: $(obj)/%.dtb
$(call cmd,dt_S_dtb)
+ifneq ($(DTC_EXT),)
+DTC = $(DTC_EXT)
+else
+DTC = $(objtree)/scripts/dtc/dtc
+endif
+
quiet_cmd_dtc = DTC $@
cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 2a48022..2eb4aec 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -1,7 +1,9 @@
# scripts/dtc makefile
hostprogs-y := dtc
+ifeq ($(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