1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/mux/gpio-mu
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: GPIO-based multiplexer controller
8
9 maintainers:
10 - Peter Rosin <peda@axentia.se>
11
12 description: |+
13 Define what GPIO pins are used to control a
14 multiplexers, if the same pins control more
15
16 The multiplexer state is defined as the numb
17 multiplexer GPIO pins, where the first pin i
18 bit. An active pin is a binary 1, an inactiv
19
20 properties:
21 compatible:
22 const: gpio-mux
23
24 mux-gpios:
25 description:
26 List of gpios used to control the multip
27
28 '#mux-control-cells':
29 enum: [ 0, 1 ]
30
31 '#mux-state-cells':
32 enum: [ 1, 2 ]
33
34 idle-state:
35 default: -1
36
37 required:
38 - compatible
39 - mux-gpios
40 anyOf:
41 - required:
42 - "#mux-control-cells"
43 - required:
44 - "#mux-state-cells"
45
46 additionalProperties: false
47
48 examples:
49 - |
50 #include <dt-bindings/gpio/gpio.h>
51
52 mux: mux-controller {
53 compatible = "gpio-mux";
54 #mux-control-cells = <0>;
55
56 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>
57 <&pioA 1 GPIO_ACTIVE_HIGH>;
58 };
59
60 adc-mux {
61 compatible = "io-channel-mux";
62 io-channels = <&adc 0>;
63 io-channel-names = "parent";
64
65 mux-controls = <&mux>;
66
67 channels = "sync-1", "in", "out", "syn
68 };
69
70 i2c-mux {
71 compatible = "i2c-mux";
72 i2c-parent = <&i2c1>;
73
74 mux-controls = <&mux>;
75
76 #address-cells = <1>;
77 #size-cells = <0>;
78
79 i2c@0 {
80 reg = <0>;
81 #address-cells = <1>;
82 #size-cells = <0>;
83
84 ssd1307: oled@3c {
85 reg = <0x3c>;
86 };
87 };
88
89 i2c@3 {
90 reg = <3>;
91 #address-cells = <1>;
92 #size-cells = <0>;
93
94 pca9555: pca9555@20 {
95 reg = <0x20>;
96 };
97 };
98 };
99 ...
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