kernel/Documentation/devicetree/bindings/clock/renesas,cpg-mssr.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: "http://devicetree.org/schemas/clock/renesas,cpg-mssr.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: Renesas Clock Pulse Generator / Module Standby and Software Reset

maintainers:
  - Geert Uytterhoeven <geert+renesas@glider.be>

description: |
  On Renesas ARM SoCs (SH/R-Mobile, R-Car, RZ), the CPG (Clock Pulse Generator)
  and MSSR (Module Standby and Software Reset) blocks are intimately connected,
  and share the same register block.

  They provide the following functionalities:
    - The CPG block generates various core clocks,
    - The MSSR block provides two functions:
        1. Module Standby, providing a Clock Domain to control the clock supply
           to individual SoC devices,
        2. Reset Control, to perform a software reset of individual SoC devices.

properties:
  compatible:
    enum:
      - renesas,r7s9210-cpg-mssr  # RZ/A2
      - renesas,r8a7742-cpg-mssr  # RZ/G1H
      - renesas,r8a7743-cpg-mssr  # RZ/G1M
      - renesas,r8a7744-cpg-mssr  # RZ/G1N
      - renesas,r8a7745-cpg-mssr  # RZ/G1E
      - renesas,r8a77470-cpg-mssr # RZ/G1C
      - renesas,r8a774a1-cpg-mssr # RZ/G2M
      - renesas,r8a774b1-cpg-mssr # RZ/G2N
      - renesas,r8a774c0-cpg-mssr # RZ/G2E
      - renesas,r8a774e1-cpg-mssr # RZ/G2H
      - renesas,r8a7790-cpg-mssr  # R-Car H2
      - renesas,r8a7791-cpg-mssr  # R-Car M2-W
      - renesas,r8a7792-cpg-mssr  # R-Car V2H
      - renesas,r8a7793-cpg-mssr  # R-Car M2-N
      - renesas,r8a7794-cpg-mssr  # R-Car E2
      - renesas,r8a7795-cpg-mssr  # R-Car H3
      - renesas,r8a7796-cpg-mssr  # R-Car M3-W
      - renesas,r8a77961-cpg-mssr # R-Car M3-W+
      - renesas,r8a77965-cpg-mssr # R-Car M3-N
      - renesas,r8a77970-cpg-mssr # R-Car V3M
      - renesas,r8a77980-cpg-mssr # R-Car V3H
      - renesas,r8a77990-cpg-mssr # R-Car E3
      - renesas,r8a77995-cpg-mssr # R-Car D3
      - renesas,r8a779a0-cpg-mssr # R-Car V3U

  reg:
    maxItems: 1

  clocks:
    minItems: 1
    maxItems: 2

  clock-names:
    minItems: 1
    maxItems: 2
    items:
      enum:
        - extal     # All
        - extalr    # Most R-Car Gen3 and RZ/G2
        - usb_extal # Most R-Car Gen2 and RZ/G1

  '#clock-cells':
    description: |
      - For CPG core clocks, the two clock specifier cells must be "CPG_CORE"
        and a core clock reference, as defined in
        <dt-bindings/clock/*-cpg-mssr.h>
      - For module clocks, the two clock specifier cells must be "CPG_MOD" and
        a module number, as defined in the datasheet.
    const: 2

  '#power-domain-cells':
    description:
      SoC devices that are part of the CPG/MSSR Clock Domain and can be
      power-managed through Module Standby should refer to the CPG device node
      in their "power-domains" property, as documented by the generic PM Domain
      bindings in Documentation/devicetree/bindings/power/power-domain.yaml.
    const: 0

  '#reset-cells':
    description:
      The single reset specifier cell must be the module number, as defined in
      the datasheet.
    const: 1

if:
  not:
    properties:
      compatible:
        items:
          enum:
            - renesas,r7s9210-cpg-mssr
then:
  required:
    - '#reset-cells'

required:
  - compatible
  - reg
  - clocks
  - clock-names
  - '#clock-cells'
  - '#power-domain-cells'

additionalProperties: false

examples:
  - |
    cpg: clock-controller@e6150000 {
            compatible = "renesas,r8a7795-cpg-mssr";
            reg = <0xe6150000 0x1000>;
            clocks = <&extal_clk>, <&extalr_clk>;
            clock-names = "extal", "extalr";
            #clock-cells = <2>;
            #power-domain-cells = <0>;
            #reset-cells = <1>;
    };