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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/cpufreq/apple,cluster-cpufreq.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Apple SoC cluster cpufreq device
maintainers:
- Hector Martin <marcan@marcan.st>
description: |
Apple SoCs (e.g. M1) have a per-cpu-cluster DVFS controller that is part of
the cluster management register block. This binding uses the standard
operating-points-v2 table to define the CPU performance states, with the
opp-level property specifying the hardware p-state index for that level.
properties:
compatible:
oneOf:
- items:
- enum:
- apple,t8103-cluster-cpufreq
- apple,t8112-cluster-cpufreq
- const: apple,cluster-cpufreq
- items:
- const: apple,t6000-cluster-cpufreq
- const: apple,t8103-cluster-cpufreq
- const: apple,cluster-cpufreq
reg:
maxItems: 1
'#performance-domain-cells':
const: 0
required:
- compatible
- reg
- '#performance-domain-cells'
additionalProperties: false
examples:
- |
// This example shows a single CPU per domain and 2 domains,
// with two p-states per domain.
// Shipping hardware has 2-4 CPUs per domain and 2-6 domains.
cpus {
#address-cells = <2>;
#size-cells = <0>;
cpu@0 {
compatible = "apple,icestorm";
device_type = "cpu";
reg = <0x0 0x0>;
operating-points-v2 = <&ecluster_opp>;
performance-domains = <&cpufreq_e>;
};
cpu@10100 {
compatible = "apple,firestorm";
device_type = "cpu";
reg = <0x0 0x10100>;
operating-points-v2 = <&pcluster_opp>;
performance-domains = <&cpufreq_p>;
};
};
ecluster_opp: opp-table-0 {
compatible = "operating-points-v2";
opp-shared;
opp01 {
opp-hz = /bits/ 64 <600000000>;
opp-level = <1>;
clock-latency-ns = <7500>;
};
opp02 {
opp-hz = /bits/ 64 <972000000>;
opp-level = <2>;
clock-latency-ns = <22000>;
};
};
pcluster_opp: opp-table-1 {
compatible = "operating-points-v2";
opp-shared;
opp01 {
opp-hz = /bits/ 64 <600000000>;
opp-level = <1>;
clock-latency-ns = <8000>;
};
opp02 {
opp-hz = /bits/ 64 <828000000>;
opp-level = <2>;
clock-latency-ns = <19000>;
};
};
soc {
#address-cells = <2>;
#size-cells = <2>;
cpufreq_e: performance-controller@210e20000 {
compatible = "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
reg = <0x2 0x10e20000 0 0x1000>;
#performance-domain-cells = <0>;
};
cpufreq_p: performance-controller@211e20000 {
compatible = "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
reg = <0x2 0x11e20000 0 0x1000>;
#performance-domain-cells = <0>;
};
};
|
