linux/Documentation/devicetree/bindings/clock/silabs,si5351.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/silabs,si5351.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Silicon Labs Si5351A/B/C programmable I2C clock generators

description: |
  The Silicon Labs Si5351A/B/C are programmable I2C clock generators with up to
  8 outputs. Si5351A also has a reduced pin-count package (10-MSOP) where only 3
  output clocks are accessible. The internal structure of the clock generators
  can be found in [1].

  [1] Si5351A/B/C Data Sheet
      https://www.skyworksinc.com/-/media/Skyworks/SL/documents/public/data-sheets/Si5351-B.pdf

maintainers:
  - Alvin Šipraga <alsi@bang-olufsen.dk>

properties:
  compatible:
    enum:
      - silabs,si5351a      # Si5351A, 20-QFN package
      - silabs,si5351a-msop # Si5351A, 10-MSOP package
      - silabs,si5351b      # Si5351B, 20-QFN package
      - silabs,si5351c      # Si5351C, 20-QFN package

  reg:
    enum:
      - 0x60
      - 0x61

  "#address-cells":
    const: 1

  "#size-cells":
    const: 0

  "#clock-cells":
    const: 1

  clocks:
    minItems: 1
    maxItems: 2

  clock-names:
    minItems: 1
    items:
      - const: xtal
      - const: clkin

  silabs,pll-source:
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    description: |
      A list of cell pairs containing a PLL index and its source. Allows to
      overwrite clock source of the internal PLLs.
    items:
      items:
        - description: PLL A (0) or PLL B (1)
          enum: [ 0, 1 ]
        - description: PLL source, XTAL (0) or CLKIN (1, Si5351C only).
          enum: [ 0, 1 ]

  silabs,pll-reset-mode:
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    minItems: 1
    maxItems: 2
    description: A list of cell pairs containing a PLL index and its reset mode.
    items:
      items:
        - description: PLL A (0) or PLL B (1)
          enum: [ 0, 1 ]
        - description: |
            Reset mode for the PLL. Mode can be one of:

                0 - reset whenever PLL rate is adjusted (default mode)
                1 - do not reset when PLL rate is adjusted

            In mode 1, the PLL is only reset if the silabs,pll-reset is
            specified in one of the clock output child nodes that also sources
            the PLL. This mode may be preferable if output clocks are expected
            to be adjusted without glitches.
          enum: [ 0, 1 ]

patternProperties:
  "^clkout@[0-7]$":
    type: object

    additionalProperties: false

    properties:
      reg:
        description: Clock output number.

      clock-frequency: true

      silabs,clock-source:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: |
          Source clock of the this output's divider stage.

          0 - use multisynth N for this output, where N is the output number
          1 - use either multisynth 0 (if output number is 0-3) or multisynth 4
              (otherwise) for this output
          2 - use XTAL for this output
          3 - use CLKIN for this output (Si5351C only)

      silabs,drive-strength:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [ 2, 4, 6, 8 ]
        description: Output drive strength in mA.

      silabs,multisynth-source:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [ 0, 1 ]
        description:
          Source PLL A (0) or B (1) for the corresponding multisynth divider.

      silabs,pll-master:
        type: boolean
        description: |
          The frequency of the source PLL is allowed to be changed by the
          multisynth when setting the rate of this clock output.

      silabs,pll-reset:
        type: boolean
        description: Reset the source PLL when enabling this clock output.

      silabs,disable-state:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [ 0, 1, 2, 3 ]
        description: |
          Clock output disable state. The state can be one of:

          0 - clock output is driven LOW when disabled
          1 - clock output is driven HIGH when disabled
          2 - clock output is FLOATING (HIGH-Z) when disabled
          3 - clock output is never disabled

    allOf:
      - if:
          properties:
            compatible:
              contains:
                const: silabs,si5351a-msop
        then:
          properties:
            reg:
              maximum: 2
        else:
          properties:
            reg:
              maximum: 7

      - if:
          properties:
            compatible:
              contains:
                const: silabs,si5351c
        then:
          properties:
            silabs,clock-source:
              enum: [ 0, 1, 2, 3 ]
        else:
          properties:
            silabs,clock-source:
              enum: [ 0, 1, 2 ]

    required:
      - reg

allOf:
  - if:
      properties:
        compatible:
          contains:
            enum:
              - silabs,si5351a
              - silabs,si5351a-msop
              - silabs,si5351b
    then:
      properties:
        clocks:
          maxItems: 1
        clock-names:
          maxItems: 1

required:
  - reg
  - "#address-cells"
  - "#size-cells"
  - "#clock-cells"
  - clocks
  - clock-names

unevaluatedProperties: false

examples:
  - |
    i2c {
      #address-cells = <1>;
      #size-cells = <0>;

      clock-generator@60 {
        compatible = "silabs,si5351a-msop";
        reg = <0x60>;
        #address-cells = <1>;
        #size-cells = <0>;
        #clock-cells = <1>;

        /* Connect XTAL input to 25MHz reference */
        clocks = <&ref25>;
        clock-names = "xtal";

        /* Use XTAL input as source of PLL0 and PLL1 */
        silabs,pll-source = <0 0>, <1 0>;

        /* Don't reset PLL1 on rate adjustment */
        silabs,pll-reset-mode = <1 1>;

        /*
         * Overwrite CLK0 configuration with:
         * - 8 mA output drive strength
         * - PLL0 as clock source of multisynth 0
         * - Multisynth 0 as clock source of output divider
         * - Multisynth 0 can change PLL0
         * - Set initial clock frequency of 74.25MHz
         */
        clkout@0 {
          reg = <0>;
          silabs,drive-strength = <8>;
          silabs,multisynth-source = <0>;
          silabs,clock-source = <0>;
          silabs,pll-master;
          clock-frequency = <74250000>;
        };

        /*
         * Overwrite CLK1 configuration with:
         * - 4 mA output drive strength
         * - PLL1 as clock source of multisynth 1
         * - Multisynth 1 as clock source of output divider
         * - Multisynth 1 can change PLL1
         * - Reset PLL1 when enabling this clock output
         */
        clkout@1 {
          reg = <1>;
          silabs,drive-strength = <4>;
          silabs,multisynth-source = <1>;
          silabs,clock-source = <0>;
          silabs,pll-master;
          silabs,pll-reset;
        };

        /*
         * Overwrite CLK2 configuration with:
         * - XTAL as clock source of output divider
         */
        clkout@2 {
          reg = <2>;
          silabs,clock-source = <2>;
        };
      };
    };