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