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Commit 999159a5 authored by Vineet Gupta's avatar Vineet Gupta
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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: default avatarVineet 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: default avatarRob Herring <rob.herring@calxeda.com>
Reviewed-by: default avatarJames Hogan <james.hogan@imgtec.com>
parent ee36d172

arch/arc/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -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"

arch/arc/Makefile

+9 −0
Original line number Diff line number Diff line
@@ -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)

arch/arc/boot/dts/Makefile

0 → 100644
+13 −0
Original line number Diff line number Diff line 
# Built-in dtb

builtindtb-y		:= skeleton



ifneq ($(CONFIG_ARC_BUILTIN_DTB_NAME),"")

	builtindtb-y	:= $(patsubst "%",%,$(CONFIG_ARC_BUILTIN_DTB_NAME))

endif



obj-y   += $(builtindtb-y).dtb.o

targets += $(builtindtb-y).dtb



dtbs:  $(addprefix  $(obj)/, $(builtindtb-y).dtb)



clean-files := *.dtb

arch/arc/boot/dts/skeleton.dts

0 → 100644
+10 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

/dts-v1/;



/include/ "skeleton.dtsi"

arch/arc/boot/dts/skeleton.dtsi

0 → 100644
+21 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



/*

 * Skeleton device tree; the bare minimum needed to boot; just include and

 * add a compatible value.

 */



/ {

	compatible = "snps,arc";

	#address-cells = <1>;

	#size-cells = <1>;

	chosen { };

	aliases { };

	memory { device_type = "memory"; reg = <0 0>; };

};