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