xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/opp/allwinner,sun50i-h6-operating-points.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/opp/allwinner,sun50i-h6-operating-points.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Allwinner H6 CPU OPP Device Tree Bindings

maintainers:
  - Chen-Yu Tsai <wens@csie.org>
  - Maxime Ripard <mripard@kernel.org>

description: |
  For some SoCs, the CPU frequency subset and voltage value of each
  OPP varies based on the silicon variant in use. Allwinner Process
  Voltage Scaling Tables defines the voltage and frequency value based
  on the speedbin blown in the efuse combination. The
  sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
  provide the OPP framework with required information.

properties:
  compatible:
    const: allwinner,sun50i-h6-operating-points

  nvmem-cells:
    description: |
      A phandle pointing to a nvmem-cells node representing the efuse
      registers that has information about the speedbin that is used
      to select the right frequency/voltage value pair. Please refer
      the for nvmem-cells bindings
      Documentation/devicetree/bindings/nvmem/nvmem.txt and also
      examples below.

  opp-shared: true

required:
  - compatible
  - nvmem-cells

patternProperties:
  "opp-[0-9]+":
    type: object

    properties:
      opp-hz: true

    patternProperties:
      "opp-microvolt-.*": true

    required:
      - opp-hz
      - opp-microvolt-speed0
      - opp-microvolt-speed1
      - opp-microvolt-speed2

    unevaluatedProperties: false

additionalProperties: false

examples:
  - |
    cpu_opp_table: opp-table {
        compatible = "allwinner,sun50i-h6-operating-points";
        nvmem-cells = <&speedbin_efuse>;
        opp-shared;

        opp-480000000 {
            clock-latency-ns = <244144>; /* 8 32k periods */
            opp-hz = /bits/ 64 <480000000>;

            opp-microvolt-speed0 = <880000>;
            opp-microvolt-speed1 = <820000>;
            opp-microvolt-speed2 = <800000>;
        };

        opp-720000000 {
            clock-latency-ns = <244144>; /* 8 32k periods */
            opp-hz = /bits/ 64 <720000000>;

            opp-microvolt-speed0 = <880000>;
            opp-microvolt-speed1 = <820000>;
            opp-microvolt-speed2 = <800000>;
        };

        opp-816000000 {
            clock-latency-ns = <244144>; /* 8 32k periods */
            opp-hz = /bits/ 64 <816000000>;

            opp-microvolt-speed0 = <880000>;
            opp-microvolt-speed1 = <820000>;
            opp-microvolt-speed2 = <800000>;
        };

        opp-888000000 {
            clock-latency-ns = <244144>; /* 8 32k periods */
            opp-hz = /bits/ 64 <888000000>;

            opp-microvolt-speed0 = <940000>;
            opp-microvolt-speed1 = <820000>;
            opp-microvolt-speed2 = <800000>;
        };

        opp-1080000000 {
            clock-latency-ns = <244144>; /* 8 32k periods */
            opp-hz = /bits/ 64 <1080000000>;

            opp-microvolt-speed0 = <1060000>;
            opp-microvolt-speed1 = <880000>;
            opp-microvolt-speed2 = <840000>;
        };

        opp-1320000000 {
            clock-latency-ns = <244144>; /* 8 32k periods */
            opp-hz = /bits/ 64 <1320000000>;

            opp-microvolt-speed0 = <1160000>;
            opp-microvolt-speed1 = <940000>;
            opp-microvolt-speed2 = <900000>;
        };

        opp-1488000000 {
            clock-latency-ns = <244144>; /* 8 32k periods */
            opp-hz = /bits/ 64 <1488000000>;

            opp-microvolt-speed0 = <1160000>;
            opp-microvolt-speed1 = <1000000>;
            opp-microvolt-speed2 = <960000>;
        };
    };

...