mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
74 lines
1.3 KiB
Plaintext
74 lines
1.3 KiB
Plaintext
|
==================
|
||
|
|
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";
|
||
|
|
};
|
||
|
|
};
|