xref: /linux/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml (revision 64b14a184e83eb62ea0615e31a409956049d40e7) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/i2c/aspeed,i2c.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ASPEED I2C on the AST24XX, AST25XX, and AST26XX SoCs Device Tree Bindings
8
9maintainers:
10  - Rayn Chen <rayn_chen@aspeedtech.com>
11
12allOf:
13  - $ref: /schemas/i2c/i2c-controller.yaml#
14
15properties:
16  compatible:
17    enum:
18      - aspeed,ast2400-i2c-bus
19      - aspeed,ast2500-i2c-bus
20      - aspeed,ast2600-i2c-bus
21
22  reg:
23    minItems: 1
24    items:
25      - description: address offset and range of bus
26      - description: address offset and range of bus buffer
27
28  interrupts:
29    maxItems: 1
30
31  clocks:
32    maxItems: 1
33    description:
34      root clock of bus, should reference the APB
35      clock in the second cell
36
37  resets:
38    maxItems: 1
39
40  bus-frequency:
41    minimum: 500
42    maximum: 4000000
43    default: 100000
44    description: frequency of the bus clock in Hz defaults to 100 kHz when not
45      specified
46
47  multi-master:
48    type: boolean
49    description:
50      states that there is another master active on this bus
51
52required:
53  - reg
54  - compatible
55  - clocks
56  - resets
57
58unevaluatedProperties: false
59
60examples:
61  - |
62    #include <dt-bindings/clock/aspeed-clock.h>
63    i2c0: i2c-bus@40 {
64      #address-cells = <1>;
65      #size-cells = <0>;
66      compatible = "aspeed,ast2500-i2c-bus";
67      reg = <0x40 0x40>;
68      clocks = <&syscon ASPEED_CLK_APB>;
69      resets = <&syscon ASPEED_RESET_I2C>;
70      bus-frequency = <100000>;
71      interrupts = <0>;
72      interrupt-parent = <&i2c_ic>;
73    };
74