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kernel
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linux
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: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Rob Herring <robh@kernel.org>
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Documentation/devicetree/bindings/csky/cpus.txt
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Documentation/devicetree/bindings/csky/cpus.txt
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==================
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C-SKY CPU Bindings
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==================
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The device tree allows to describe the layout of CPUs in a system through
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the "cpus" node, which in turn contains a number of subnodes (ie "cpu")
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defining properties for every cpu.
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Only SMP system need to care about the cpus node and single processor
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needn't define cpus node at all.
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=====================================
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cpus and cpu node bindings definition
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=====================================
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- cpus node
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Description: Container of cpu nodes
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The node name must be "cpus".
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A cpus node must define the following properties:
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- #address-cells
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Usage: required
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Value type: <u32>
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Definition: must be set to 1
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- #size-cells
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Usage: required
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Value type: <u32>
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Definition: must be set to 0
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- cpu node
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Description: Describes one of SMP cores
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PROPERTIES
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- device_type
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Usage: required
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Value type: <string>
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Definition: must be "cpu"
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- reg
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Usage: required
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Value type: <u32>
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Definition: CPU index
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- compatible:
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Usage: required
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Value type: <string>
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Definition: must contain "csky", eg:
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"csky,610"
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"csky,807"
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"csky,810"
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"csky,860"
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Example:
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--------
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cpus {
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#address-cells = <1>;
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#size-cells = <0>;
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cpu@0 {
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device_type = "cpu";
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reg = <0>;
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status = "ok";
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};
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cpu@1 {
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device_type = "cpu";
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reg = <1>;
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status = "ok";
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};
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};