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1========================================================
2Secondary CPU enable-method "al,alpine-smp" binding
3========================================================
4
5This document describes the "al,alpine-smp" method for
6enabling secondary CPUs. To apply to all CPUs, a single
7"al,alpine-smp" enable method should be defined in the
8"cpus" node.
9
10Enable method name: "al,alpine-smp"
11Compatible machines: "al,alpine"
12Compatible CPUs: "arm,cortex-a15"
13Related properties: (none)
14
15Note:
16This enable method requires valid nodes compatible with
17"al,alpine-cpu-resume" and "al,alpine-nb-service".
18
19
20* Alpine CPU resume registers
21
22The CPU resume register are used to define required resume address after
23reset.
24
25Properties:
26- compatible : Should contain "al,alpine-cpu-resume".
27- reg : Offset and length of the register set for the device
28
29
30* Alpine System-Fabric Service Registers
31
32The System-Fabric Service Registers allow various operation on CPU and
33system fabric, like powering CPUs off.
34
35Properties:
36- compatible : Should contain "al,alpine-sysfabric-service" and "syscon".
37- reg : Offset and length of the register set for the device
38
39
40Example:
41
42cpus {
43 #address-cells = <1>;
44 #size-cells = <0>;
45 enable-method = "al,alpine-smp";
46
47 cpu@0 {
48 compatible = "arm,cortex-a15";
49 device_type = "cpu";
50 reg = <0>;
51 };
52
53 cpu@1 {
54 compatible = "arm,cortex-a15";
55 device_type = "cpu";
56 reg = <1>;
57 };
58
59 cpu@2 {
60 compatible = "arm,cortex-a15";
61 device_type = "cpu";
62 reg = <2>;
63 };
64
65 cpu@3 {
66 compatible = "arm,cortex-a15";
67 device_type = "cpu";
68 reg = <3>;
69 };
70};
71
72cpu_resume {
73 compatible = "al,alpine-cpu-resume";
74 reg = <0xfbff5ed0 0x30>;
75};
76
77nb_service {
78 compatible = "al,alpine-sysfabric-service", "syscon";
79 reg = <0xfb070000 0x10000>;
80};