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authorGuo Ren <ren_guo@c-sky.com>2018-09-05 09:25:22 +0300
committerGuo Ren <ren_guo@c-sky.com>2018-10-25 19:54:27 +0300
commit19fef6c4893d0321ec07978cb56bda0a753dde8c (patch)
tree0ecd94efa2befacaf0d14ec62ccf79dae882fb33 /Documentation
parent735ee005c371b2d8d1dbf0542590d17f1e0a0b2f (diff)
downloadlinux-19fef6c4893d0321ec07978cb56bda0a753dde8c.tar.xz
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>
Diffstat (limited to 'Documentation')
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diff --git a/Documentation/devicetree/bindings/csky/cpus.txt b/Documentation/devicetree/bindings/csky/cpus.txt
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+==================
+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";
+ };
+ };