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authorSascha Hauer <s.hauer@pengutronix.de>2018-11-07 09:48:28 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2018-11-08 08:57:14 +0100
commit646d1a09f05689a3a4781112a3b3e4747d0ba231 (patch)
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dts: update to v4.20-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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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";
+ };
+ };