[RFC 01/13] ARM: dts: allow building .dtb files under platform subdirs

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Add support to base ARM makefile for building .dtb files under platform
specific subdirs (e.g. arch/arm/boot/dts/ti for TI SoCs.)

Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
 arch/arm/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index e4e537f..f6c90bc 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -343,8 +343,10 @@ $(BOOT_TARGETS): vmlinux
 $(INSTALL_TARGETS):
 	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@
 
+%.dtb: dtbdir=$(patsubst %/,%,$(patsubst %./,%,$(boot)/dts/$(dir $@)))
+
 %.dtb: | scripts
-	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $(boot)/dts/$@
+	$(Q)$(MAKE) $(build)=$(dtbdir) MACHINE=$(MACHINE) $(boot)/dts/$@
 
 PHONY += dtbs dtbs_install
 
-- 
1.9.1

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