1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-mux
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: Common i2c bus multiplexer/switch prope
8
9 maintainers:
10 - Peter Rosin <peda@axentia.se>
11
12 description: |+
13 An i2c bus multiplexer/switch will have seve
14 uniquely in a device dependent manner. The
15 multiplexer/switch will have one child node
16
17 For i2c multiplexers/switches that have chil
18 i2c child busses and other child nodes, the
19 populating the i2c child busses. If an 'i2c
20 subnodes of this will be considered as i2c c
21
22 properties:
23 $nodename:
24 pattern: '^(i2c-?)?mux'
25
26 '#address-cells':
27 const: 1
28
29 '#size-cells':
30 const: 0
31
32 patternProperties:
33 '^i2c@[0-9a-f]+$':
34 $ref: /schemas/i2c/i2c-controller.yaml
35 unevaluatedProperties: false
36
37 properties:
38 reg:
39 description: The mux selector sub-bus
40 maxItems: 1
41
42 additionalProperties: true
43
44 examples:
45 - |
46 /*
47 * An NXP pca9548 8 channel I2C multiplexe
48 * with two NXP pca8574 GPIO expanders att
49 * ports 3 and 4.
50 */
51 i2c {
52 #address-cells = <1>;
53 #size-cells = <0>;
54
55 i2c-mux@70 {
56 compatible = "nxp,pca9548";
57 reg = <0x70>;
58 #address-cells = <1>;
59 #size-cells = <0>;
60
61 i2c@3 {
62 #address-cells = <1>;
63 #size-cells = <0>;
64 reg = <3>;
65
66 gpio@20 {
67 compatible = "nxp,pca9555"
68 gpio-controller;
69 #gpio-cells = <2>;
70 reg = <0x20>;
71 };
72 };
73 i2c@4 {
74 #address-cells = <1>;
75 #size-cells = <0>;
76 reg = <4>;
77
78 gpio@20 {
79 compatible = "nxp,pca9555"
80 gpio-controller;
81 #gpio-cells = <2>;
82 reg = <0x20>;
83 };
84 };
85 };
86 };
87 ...
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