[PATCH 1/7] kbuild: Add target to build dtb overlay files

[Sascha Hauer]

Device tree overlay files have the suffix dtso in source format
and dtbo in binary format. Add the necessary targets to build dtbo
files from dtso files and also dtbo.o files to include into the
barebox binary.
The overlay files shouldn't include the device tree snippets from
CONFIG_EXTERNAL_DTS_FRAGMENTS which makes it necessary to specify
these fragments as an argument to cmd_dtc.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 scripts/Makefile.build |  4 ++++
 scripts/Makefile.lib   | 11 ++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 216f03677b..33480a81b4 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -258,12 +258,16 @@ intermediate_targets = $(foreach sfx, $(2), \
 					$(filter %$(strip $(1)), $(targets))))
 # %.asn1.o <- %.asn1.[ch] <- %.asn1
 # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
+# %.dtbo.o <- %.dtbo.S <- %.dtbo <- %.dtso
 # %.dtb.pbl.o <- %.dtb.S <- %.dtb <- %.dts (Barebox only)
+# %.dtbo.pbl.o <- %.dtbo.S <- %.dtbo <- %.dtso (Barebox only)
 # %.lex.o <- %.lex.c <- %.l
 # %.tab.o <- %.tab.[ch] <- %.y
 targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
 	   $(call intermediate_targets, .dtb.o, .dtb.S .dtb.z .dtb) \
+	   $(call intermediate_targets, .dtbo.o, .dtbo.S .dtbo.z .dtbo) \
 	   $(call intermediate_targets, .dtb.pbl.o, .dtb.S .dtb.z .dtb) \
+	   $(call intermediate_targets, .dtbo.pbl.o, .dtbo.S .dtbo.z .dtbo) \
 	   $(call intermediate_targets, .lex.o, .lex.c) \
 	   $(call intermediate_targets, .tab.o, .tab.c .tab.h)
 
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 6e0d92cf75..6af2fe07b2 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -361,13 +361,19 @@ cmd_dt_S_dtb = $(srctree)/scripts/gen-dtb-s $(subst -,_,$(*F)) $< $(CONFIG_IMD)
 $(obj)/%.dtb.S: $(obj)/%.dtb $(obj)/%.dtb.z $(srctree)/scripts/gen-dtb-s FORCE
 	$(call if_changed,dt_S_dtb)
 
+$(obj)/%.dtbo.S: $(obj)/%.dtbo $(obj)/%.dtbo.z $(srctree)/scripts/gen-dtb-s FORCE
+	$(call if_changed,dt_S_dtb)
+
 $(obj)/%.dtb.z: $(obj)/%.dtb FORCE
 	$(call if_changed,$(suffix_y))
 
+$(obj)/%.dtbo.z: $(obj)/%.dtbo FORCE
+	$(call if_changed,$(suffix_y))
+
 dts-frags = $(subst $(quote),,$(CONFIG_EXTERNAL_DTS_FRAGMENTS))
 quiet_cmd_dtc = DTC     $@
 # For compatibility between make 4.2 and 4.3
-cmd_dtc = /usr/bin/env echo -e '$(pound)define $(subst -,_,$(*F))_dts 1\n'$(foreach f,$< $(dts-frags),'$(pound)include "$(f)"\n') | \
+cmd_dtc = /usr/bin/env echo -e '$(pound)define $(subst -,_,$(*F))_dts 1\n'$(foreach f,$< $(2),'$(pound)include "$(f)"\n') | \
 	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) - ; \
 	$(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \
 		-i $(srctree)/arch/$(SRCARCH)/dts $(DTC_FLAGS) \
@@ -376,6 +382,9 @@ cmd_dtc = /usr/bin/env echo -e '$(pound)define $(subst -,_,$(*F))_dts 1\n'$(fore
 	cat $(depfile).pre $(depfile).dtc > $(depfile)
 
 $(obj)/%.dtb: $(src)/%.dts FORCE
+	$(call if_changed_dep,dtc,$(dts-frags))
+
+$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
 	$(call if_changed_dep,dtc)
 
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts)
-- 
2.30.2