ARC: [DeviceTree] Basic support

This is minimal infrastructure needed for devicetree work.
It uses an a sample "skeleton" devicetree - embedded in kernel image -
to print the board, manufacturer by parsing the top-level "compatible"
string.

As of now we don't need any additional "board" specific "machine_desc".

TODO: support interpreting the command line as boot-loader passed dtb

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 4d52a3bb68a0..29b5fcd9c4b6 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -83,6 +83,9 @@ head-y		:= arch/arc/kernel/head.o
 # See arch/arc/Kbuild for content of core part of the kernel
 core-y          += arch/arc/
 
+# w/o this dtb won't embed into kernel binary
+core-y          += arch/arc/boot/dts/
+
 # w/o this ifneq, make ARCH=arc clean was crapping out
 ifneq ($(platform-y),)
 core-y          += arch/arc/plat-$(PLATFORM)/
@@ -101,6 +104,12 @@ bootpImage: vmlinux
 uImage: vmlinux
         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 
+%.dtb %.dtb.S %.dtb.o: scripts
+        $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
+
+dtbs: scripts
+        $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
+
 archclean:
         $(Q)$(MAKE) $(clean)=$(boot)