xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/cpufreq/cpufreq-mediatek-hw.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: MediaTek's CPUFREQ

maintainers:
  - Hector Yuan <hector.yuan@mediatek.com>

description:
  CPUFREQ HW is a hardware engine used by MediaTek SoCs to
  manage frequency in hardware. It is capable of controlling
  frequency for multiple clusters.

properties:
  compatible:
    const: mediatek,cpufreq-hw

  reg:
    minItems: 1
    maxItems: 2
    description:
      Addresses and sizes for the memory of the HW bases in
      each frequency domain. Each entry corresponds to
      a register bank for each frequency domain present.

  "#performance-domain-cells":
    description:
      Number of cells in a performance domain specifier.
      Set const to 1 here for nodes providing multiple
      performance domains.
    const: 1

required:
  - compatible
  - reg
  - "#performance-domain-cells"

additionalProperties: false

examples:
  - |
    cpus {
            #address-cells = <1>;
            #size-cells = <0>;

            cpu0: cpu@0 {
                device_type = "cpu";
                compatible = "arm,cortex-a55";
                enable-method = "psci";
                performance-domains = <&performance 0>;
                reg = <0x000>;
            };
    };

    /* ... */

    soc {
        #address-cells = <2>;
        #size-cells = <2>;

        performance: performance-controller@11bc00 {
            compatible = "mediatek,cpufreq-hw";
            reg = <0 0x0011bc10 0 0x120>, <0 0x0011bd30 0 0x120>;

            #performance-domain-cells = <1>;
        };
    };