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dt-bindings: cpufreq: apple,soc-cpufreq: Add binding for Apple SoC cpufreq

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This binding represents the cpufreq/DVFS hardware present in Apple SoCs.
The hardware has an independent controller per CPU cluster, and we
represent them as unique nodes in order to accurately describe the
hardware. The driver is responsible for binding them as a single cpufreq
device (in the Linux cpufreq model).

Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2022-05-02 23:21:00 +09:00
parent 8b49c30d8f
commit d1a8368d66
1 changed files with 117 additions and 0 deletions
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Documentation/devicetree/bindings/cpufreq/apple,cluster-cpufreq.yaml Normal file
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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>;
};
};