[PATCH/RFC] kbuild: Create a rule for building device tree overlay objects

[Geert Uytterhoeven]

This allows to handle device tree overlays like plain device trees.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
Questions:
  - Do we want dtso files under arch/<arch>/boot/dts/, too?
  - Do we want to move the dts files outside the kernel repository
    first?

 scripts/Makefile.lib | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 79e86613712f2230..4b14eef1d4b2ce8f 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -292,6 +292,9 @@ cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 $(obj)/%.dtb: $(src)/%.dts FORCE
 	$(call if_changed_dep,dtc)
 
+$(obj)/%.dtbo: $(src)/%.dtso FORCE
+	$(call if_changed_dep,dtc)
+
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 
 # Bzip2
-- 
1.9.1

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