[PATCHv2 4/4] arm64: dts: add support for per sub-dir makefiles for DT building

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Currently the makefile for arm64 builds all the DT files based on
rules in the arch/arm64/boot/dts/Makefile, as this is statically
passed via the $(build)= parameter. Change the $(build) parameter
to actually point to the subdir itself, so the makefile from
that subdir can be used to set-up build flags etc., for example
setting up DTC_FLAGS. The patsubst magic is used to strip the
trailing "/" from the path, as that confuses the kbuild system.

Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
 arch/arm64/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index f04c814..2ac4358 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -128,7 +128,7 @@ zinstall install:
 	$(Q)$(MAKE) $(build)=$(boot) $@
 
 %.dtb %.dtbo: scripts
-	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
+	$(Q)$(MAKE) $(build)=$(patsubst %/,%,$(boot)/dts/$(dir $@)) $(boot)/dts/$@
 
 PHONY += dtbs dtbs_install
 
-- 
1.9.1

--
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