1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/iio/multiplexer/io-channel-mux.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: I/O channel multiplexer
8
9 maintainers:
10 - Peter Rosin <peda@axentia.se>
11
12 description: |
13 If a multiplexer is used to select which hardware signal is fed to
14 e.g. an ADC channel, these bindings describe that situation.
15
16 For each non-empty string in the channels property, an io-channel will be
17 created. The number of this io-channel is the same as the index into the list
18 of strings in the channels property, and also matches the mux controller
19 state. The mux controller state is described in
20 Documentation/devicetree/bindings/mux/mux-controller.yaml
21
22 properties:
23
24 compatible:
25 const: io-channel-mux
26
27 io-channels:
28 maxItems: 1
29 description: Channel node of the parent channel that has multiplexed input.
30
31 io-channel-names:
32 const: parent
33
34 mux-controls: true
35 mux-control-names: true
36
37 channels:
38 $ref: /schemas/types.yaml#/definitions/non-unique-string-array
39 description:
40 List of strings, labeling the mux controller states. An empty
41 string for a state means that the channel is not available.
42
43 settle-time-us:
44 default: 0
45 description:
46 Time required for analog signals to settle after muxing.
47
48 "#io-channel-cells":
49 const: 1
50
51 required:
52 - compatible
53 - io-channels
54 - io-channel-names
55 - mux-controls
56 - channels
57
58 additionalProperties: false
59
60 examples:
61 - |
62 #include <dt-bindings/gpio/gpio.h>
63 mux: mux-controller {
64 compatible = "gpio-mux";
65 #mux-control-cells = <0>;
66
67 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
68 <&pioA 1 GPIO_ACTIVE_HIGH>;
69 };
70
71 adc-mux {
72 compatible = "io-channel-mux";
73 io-channels = <&adc 0>;
74 io-channel-names = "parent";
75
76 mux-controls = <&mux>;
77 channels = "sync", "in", "system-regulator";
78 };
79 ...
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