1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/mux/gpio-mux.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
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 multiplexer. Or several
14 multiplexers, if the same pins control more than one multiplexer.
15
16 The multiplexer state is defined as the number represented by the
17 multiplexer GPIO pins, where the first pin is the least significant
18 bit. An active pin is a binary 1, an inactive pin is a binary 0.
19
20 properties:
21 compatible:
22 const: gpio-mux
23
24 mux-gpios:
25 description:
26 List of gpios used to control the multiplexer, least significant bit first.
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", "sync-2";
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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