Documentation/devicetree/bindings/clock/ti,cdce925.yaml


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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/ti,cdce925.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: TI CDCE913/925/937/949 programmable I2C clock synthesizers

maintainers:
  - Alexander Stein <alexander.stein@ew.tq-group.com>

description: |
  Flexible Low Power LVCMOS Clock Generator with SSC Support for EMI Reduction

  - CDCE(L)913: 1-PLL, 3 Outputs https://www.ti.com/product/cdce913
  - CDCE(L)925: 2-PLL, 5 Outputs https://www.ti.com/product/cdce925
  - CDCE(L)937: 3-PLL, 7 Outputs https://www.ti.com/product/cdce937
  - CDCE(L)949: 4-PLL, 9 Outputs https://www.ti.com/product/cdce949

properties:
  compatible:
    enum:
      - ti,cdce913
      - ti,cdce925
      - ti,cdce937
      - ti,cdce949

  reg:
    maxItems: 1

  clocks:
    items:
      - description: fixed parent clock

  "#clock-cells":
    const: 1

  vdd-supply:
    description: Regulator that provides 1.8V Vdd power supply

  vddout-supply:
    description: |
      Regulator that provides Vddout power supply.
      non-L variant: 2.5V or 3.3V for
      L variant: 1.8V for

  xtal-load-pf:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Crystal load-capacitor value to fine-tune performance on a
      board, or to compensate for external influences.

patternProperties:
  "^PLL[1-4]$":
    type: object
    description: |
      optional child node can be used to specify spread
      spectrum clocking parameters for a board

    additionalProperties: false

    properties:
      spread-spectrum:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: SSC mode as defined in the data sheet

      spread-spectrum-center:
        type: boolean
        description: |
          Use "centered" mode instead of "max" mode. When
          present, the clock runs at the requested frequency on average.
          Otherwise the requested frequency is the maximum value of the
          SCC range.

required:
  - compatible
  - reg
  - clocks
  - "#clock-cells"

additionalProperties: false

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

        cdce925: clock-controller@64 {
            compatible = "ti,cdce925";
            reg = <0x64>;
            clocks = <&xtal_27Mhz>;
            #clock-cells = <1>;
            xtal-load-pf = <5>;
            vdd-supply = <&reg_1v8>;
            vddout-supply = <&reg_3v3>;
            /* PLL options to get SSC 1% centered */
            PLL2 {
                spread-spectrum = <4>;
                spread-spectrum-center;
            };
        };
    };