xref: /freebsd/sys/contrib/device-tree/Bindings/i2c/apple,i2c.yaml (revision e67e85659c0de33e617e5fbf1028c6e8b49eee53) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: "http://devicetree.org/schemas/i2c/apple,i2c.yaml#"
5$schema: "http://devicetree.org/meta-schemas/core.yaml#"
6
7title: Apple/PASemi I2C controller
8
9maintainers:
10  - Sven Peter <sven@svenpeter.dev>
11
12description: |
13  Apple SoCs such as the M1 come with a I2C controller based on the one found
14  in machines with P. A. Semi's PWRficient processors.
15  The bus is used to communicate with e.g. USB PD chips or the speaker
16  amp.
17
18allOf:
19  - $ref: /schemas/i2c/i2c-controller.yaml#
20
21properties:
22  compatible:
23    items:
24      - enum:
25          - apple,t8103-i2c
26          - apple,t6000-i2c
27      - const: apple,i2c
28
29  reg:
30    maxItems: 1
31
32  clocks:
33    items:
34      - description: I2C bus reference clock
35
36  interrupts:
37    maxItems: 1
38
39  clock-frequency:
40    description: |
41      Desired I2C bus clock frequency in Hz. If not specified, 100 kHz will be
42      used. This frequency is generated by dividing the reference clock.
43      Allowed values are between ref_clk/(16*4) and ref_clk/(16*255).
44
45  power-domains:
46    maxItems: 1
47
48required:
49  - compatible
50  - reg
51  - clocks
52  - interrupts
53
54unevaluatedProperties: false
55
56examples:
57  - |
58    i2c@35010000 {
59      compatible = "apple,t8103-i2c", "apple,i2c";
60      reg = <0x35010000 0x4000>;
61      interrupt-parent = <&aic>;
62      interrupts = <0 627 4>;
63      clocks = <&ref_clk>;
64      #address-cells = <1>;
65      #size-cells = <0>;
66    };
67