xref: /freebsd/sys/contrib/device-tree/Bindings/i2c/apple,i2c.yaml (revision fac71e4e09885bb2afa3d984a0c239a52e1a7418)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/i2c/apple,i2c.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Apple/PASemi I2C controller

maintainers:
  - Sven Peter <sven@svenpeter.dev>

description: |
  Apple SoCs such as the M1 come with a I2C controller based on the one found
  in machines with P. A. Semi's PWRficient processors.
  The bus is used to communicate with e.g. USB PD chips or the speaker
  amp.

allOf:
  - $ref: /schemas/i2c/i2c-controller.yaml#

properties:
  compatible:
    items:
      - enum:
          - apple,t8103-i2c
          - apple,t8112-i2c
          - apple,t6000-i2c
      - const: apple,i2c

  reg:
    maxItems: 1

  clocks:
    items:
      - description: I2C bus reference clock

  interrupts:
    maxItems: 1

  clock-frequency:
    description: |
      Desired I2C bus clock frequency in Hz. If not specified, 100 kHz will be
      used. This frequency is generated by dividing the reference clock.
      Allowed values are between ref_clk/(16*4) and ref_clk/(16*255).

  power-domains:
    maxItems: 1

required:
  - compatible
  - reg
  - clocks
  - interrupts

unevaluatedProperties: false

examples:
  - |
    i2c@35010000 {
      compatible = "apple,t8103-i2c", "apple,i2c";
      reg = <0x35010000 0x4000>;
      interrupt-parent = <&aic>;
      interrupts = <0 627 4>;
      clocks = <&ref_clk>;
      #address-cells = <1>;
      #size-cells = <0>;
    };