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Commit 19fef6c4 authored by Guo Ren's avatar Guo Ren
Browse files

dt-bindings: csky CPU Bindings 



This patch adds the documentation to describe that how to add cpu nodes in
dts for SMP.

Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
parent 735ee005

Documentation/devicetree/bindings/csky/cpus.txt

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+73 −0
Original line number Diff line number Diff line 
==================

C-SKY CPU Bindings

==================



The device tree allows to describe the layout of CPUs in a system through

the "cpus" node, which in turn contains a number of subnodes (ie "cpu")

defining properties for every cpu.



Only SMP system need to care about the cpus node and single processor

needn't define cpus node at all.



=====================================

cpus and cpu node bindings definition

=====================================



- cpus node



	Description: Container of cpu nodes



	The node name must be "cpus".



	A cpus node must define the following properties:



	- #address-cells

		Usage: required

		Value type: <u32>

		Definition: must be set to 1

	- #size-cells

		Usage: required

		Value type: <u32>

		Definition: must be set to 0



- cpu node



	Description: Describes one of SMP cores



	PROPERTIES



	- device_type

		Usage: required

		Value type: <string>

		Definition: must be "cpu"

	- reg

		Usage: required

		Value type: <u32>

		Definition: CPU index

	- compatible:

		Usage: required

		Value type: <string>

		Definition: must contain "csky", eg:

			"csky,610"

			"csky,807"

			"csky,810"

			"csky,860"



Example:

--------



	cpus {

		#address-cells = <1>;

		#size-cells = <0>;

		cpu@0 {

			device_type = "cpu";

			reg = <0>;

			status = "ok";

		};



		cpu@1 {

			device_type = "cpu";

			reg = <1>;

			status = "ok";

		};

	};