xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/power/avs/qcom,cpr.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/power/avs/qcom,cpr.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Qualcomm Core Power Reduction (CPR)

maintainers:
  - Niklas Cassel <nks@flawful.org>

description: |
  CPR (Core Power Reduction) is a technology to reduce core power on a CPU
  or other device. Each OPP of a device corresponds to a "corner" that has
  a range of valid voltages for a particular frequency. While the device is
  running at a particular frequency, CPR monitors dynamic factors such as
  temperature, etc. and suggests adjustments to the voltage to save power
  and meet silicon characteristic requirements.

properties:
  compatible:
    items:
      - enum:
          - qcom,qcs404-cpr
      - const: qcom,cpr

  reg:
    description: Base address and size of the RBCPR register region.
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    items:
      - description: Reference clock.

  clock-names:
    items:
      - const: ref

  vdd-apc-supply:
    description: APC regulator supply.

  '#power-domain-cells':
    const: 0

  operating-points-v2:
    description: |
      A phandle to the OPP table containing the performance states
      supported by the CPR power domain.

  acc-syscon:
    $ref: /schemas/types.yaml#/definitions/phandle
    description: A phandle to the syscon used for writing ACC settings.

  nvmem-cells:
    items:
      - description: Corner 1 quotient offset
      - description: Corner 2 quotient offset
      - description: Corner 3 quotient offset
      - description: Corner 1 initial voltage
      - description: Corner 2 initial voltage
      - description: Corner 3 initial voltage
      - description: Corner 1 quotient
      - description: Corner 2 quotient
      - description: Corner 3 quotient
      - description: Corner 1 ring oscillator
      - description: Corner 2 ring oscillator
      - description: Corner 3 ring oscillator
      - description: Fuse revision

  nvmem-cell-names:
    items:
      - const: cpr_quotient_offset1
      - const: cpr_quotient_offset2
      - const: cpr_quotient_offset3
      - const: cpr_init_voltage1
      - const: cpr_init_voltage2
      - const: cpr_init_voltage3
      - const: cpr_quotient1
      - const: cpr_quotient2
      - const: cpr_quotient3
      - const: cpr_ring_osc1
      - const: cpr_ring_osc2
      - const: cpr_ring_osc3
      - const: cpr_fuse_revision

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - clock-names
  - vdd-apc-supply
  - '#power-domain-cells'
  - operating-points-v2
  - nvmem-cells
  - nvmem-cell-names

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    cpr_opp_table: opp-table-cpr {
        compatible = "operating-points-v2-qcom-level";

        cpr_opp1: opp1 {
            opp-level = <1>;
            qcom,opp-fuse-level = <1>;
        };
        cpr_opp2: opp2 {
            opp-level = <2>;
            qcom,opp-fuse-level = <2>;
        };
        cpr_opp3: opp3 {
            opp-level = <3>;
            qcom,opp-fuse-level = <3>;
        };
    };

    power-controller@b018000 {
        compatible = "qcom,qcs404-cpr", "qcom,cpr";
        reg = <0x0b018000 0x1000>;
        interrupts = <0 15 IRQ_TYPE_EDGE_RISING>;
        clocks = <&xo_board>;
        clock-names = "ref";
        vdd-apc-supply = <&pms405_s3>;
        #power-domain-cells = <0>;
        operating-points-v2 = <&cpr_opp_table>;
        acc-syscon = <&tcsr>;

        nvmem-cells = <&cpr_efuse_quot_offset1>,
            <&cpr_efuse_quot_offset2>,
            <&cpr_efuse_quot_offset3>,
            <&cpr_efuse_init_voltage1>,
            <&cpr_efuse_init_voltage2>,
            <&cpr_efuse_init_voltage3>,
            <&cpr_efuse_quot1>,
            <&cpr_efuse_quot2>,
            <&cpr_efuse_quot3>,
            <&cpr_efuse_ring1>,
            <&cpr_efuse_ring2>,
            <&cpr_efuse_ring3>,
            <&cpr_efuse_revision>;
        nvmem-cell-names = "cpr_quotient_offset1",
            "cpr_quotient_offset2",
            "cpr_quotient_offset3",
            "cpr_init_voltage1",
            "cpr_init_voltage2",
            "cpr_init_voltage3",
            "cpr_quotient1",
            "cpr_quotient2",
            "cpr_quotient3",
            "cpr_ring_osc1",
            "cpr_ring_osc2",
            "cpr_ring_osc3",
            "cpr_fuse_revision";
    };