Add support for building DT overlay targets, which can be applied
either runtime or statically on top of base devicetree blobs. The
only supported runtime application of overlays right now is during
bootloader execution; if the bootloader in question supports this.

Signed-off-by: Tero Kristo <redacted>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2: no changes, just split up the series into parts
RESEND: just added Frank back to delivery, whom I accidentally dropped

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

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 61e5966..527aab9 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib

@@ -292,6 +292,9 @@ cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 	$(call if_changed_dep,dtc)
 
+$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
+	$(call if_changed_dep,dtc)
+
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 
 # Bzip2

-- 
1.9.1

--
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