xref: /freebsd/sys/contrib/device-tree/Bindings/csky/cpus.txt (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)

==================
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";
		};
	};