arm/dt: Add dtb make rule

Add a make rule to compile dt blobs for ARM.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Shawn Guo <shawn.guo@freescale.com>
Tested-by: Jason Liu <jason.hui@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 13 insertions, 0 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index f5b2b390c8f..f7135595eb7 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -281,6 +281,12 @@ zImage Image xipImage bootpImage uImage: vmlinux
 zinstall uinstall install: vmlinux
         $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@
 
+%.dtb:
+        $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
+
+dtbs:
+        $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
+
 # We use MRPROPER_FILES and CLEAN_FILES now
 archclean:
         $(Q)$(MAKE) $(clean)=$(boot)
@@ -297,6 +303,7 @@ define archhelp
   echo  '  uImage        - U-Boot wrapped zImage'
   echo  '  bootpImage    - Combined zImage and initial RAM disk' 
   echo  '                  (supply initrd image via make variable INITRD=<path>)'
+  echo  '  dtbs          - Build device tree blobs for enabled boards'
   echo  '  install       - Install uncompressed kernel'
   echo  '  zinstall      - Install compressed kernel'
   echo  '  uinstall      - Install U-Boot wrapped compressed kernel'
diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile
index 9128fddf110..a1edfd5a129 100644
--- a/arch/arm/boot/Makefile
+++ b/arch/arm/boot/Makefile
@@ -59,6 +59,12 @@ $(obj)/zImage:	$(obj)/compressed/vmlinux FORCE
 
 endif
 
+# Rule to build device tree blobs
+$(obj)/%.dtb: $(src)/dts/%.dts
+        $(call cmd,dtc)
+
+$(obj)/dtbs: $(addprefix $(obj)/, $(dtb-y))
+
 quiet_cmd_uimage = UIMAGE  $@
       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A arm -O linux -T kernel \
                    -C none -a $(LOADADDR) -e $(STARTADDR) \