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/Kconfig b/arch/arc/Kconfig
index a3538493e353..76668579b543 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -24,8 +24,11 @@ config ARC
         select GENERIC_SMP_IDLE_THREAD
         select HAVE_GENERIC_HARDIRQS
         select HAVE_MEMBLOCK
+        select IRQ_DOMAIN
         select MODULES_USE_ELF_RELA
         select NO_BOOTMEM
+        select OF
+        select OF_EARLY_FLATTREE
 
 config SCHED_OMIT_FRAME_POINTER
         def_bool y
@@ -320,6 +323,12 @@ config CMDLINE_UBOOT
           to it. kernel startup code will copy the string into cmdline buffer
           and also append CONFIG_CMDLINE.
 
+config ARC_BUILTIN_DTB_NAME
+        string "Built in DTB"
+        help
+          Set the name of the DTB to embed in the vmlinux binary
+          Leaving it blank selects the minimal "skeleton" dtb
+
 source "kernel/Kconfig.preempt"
 
 endmenu  # "ARC Architecture Configuration"