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/iio/multipl 4 $id: http://devicetree.org/schemas/iio/multiplexer/io-channel-mux.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: I/O channel multiplexer !! 7 title: I/O channel multiplexer bindings
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 If a multiplexer is used to select which har 13 If a multiplexer is used to select which hardware signal is fed to
14 e.g. an ADC channel, these bindings describe 14 e.g. an ADC channel, these bindings describe that situation.
15 15
16 For each non-empty string in the channels pr 16 For each non-empty string in the channels property, an io-channel will be
17 created. The number of this io-channel is th 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 als 18 of strings in the channels property, and also matches the mux controller
19 state. The mux controller state is described 19 state. The mux controller state is described in
20 Documentation/devicetree/bindings/mux/mux-co 20 Documentation/devicetree/bindings/mux/mux-controller.yaml
21 21
22 properties: 22 properties:
23 23
24 compatible: 24 compatible:
25 const: io-channel-mux 25 const: io-channel-mux
26 26
27 io-channels: 27 io-channels:
28 maxItems: 1 28 maxItems: 1
29 description: Channel node of the parent ch 29 description: Channel node of the parent channel that has multiplexed input.
30 30
31 io-channel-names: 31 io-channel-names:
32 const: parent 32 const: parent
33 33
34 mux-controls: true 34 mux-controls: true
35 mux-control-names: true 35 mux-control-names: true
36 36
37 channels: 37 channels:
38 $ref: /schemas/types.yaml#/definitions/non !! 38 $ref: /schemas/types.yaml#/definitions/string-array
39 description: 39 description:
40 List of strings, labeling the mux contro !! 40 List of strings, labeling the mux controller states.
41 string for a state means that the channe <<
42 <<
43 settle-time-us: <<
44 default: 0 <<
45 description: <<
46 Time required for analog signals to sett <<
47 <<
48 "#io-channel-cells": <<
49 const: 1 <<
50 41
51 required: 42 required:
52 - compatible 43 - compatible
53 - io-channels 44 - io-channels
54 - io-channel-names 45 - io-channel-names
55 - mux-controls 46 - mux-controls
56 - channels 47 - channels
57 48
58 additionalProperties: false 49 additionalProperties: false
59 50
60 examples: 51 examples:
61 - | 52 - |
62 #include <dt-bindings/gpio/gpio.h> 53 #include <dt-bindings/gpio/gpio.h>
63 mux: mux-controller { 54 mux: mux-controller {
64 compatible = "gpio-mux"; 55 compatible = "gpio-mux";
65 #mux-control-cells = <0>; 56 #mux-control-cells = <0>;
66 57
67 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, 58 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
68 <&pioA 1 GPIO_ACTIVE_HIGH>; 59 <&pioA 1 GPIO_ACTIVE_HIGH>;
69 }; 60 };
70 61
71 adc-mux { 62 adc-mux {
72 compatible = "io-channel-mux"; 63 compatible = "io-channel-mux";
73 io-channels = <&adc 0>; 64 io-channels = <&adc 0>;
74 io-channel-names = "parent"; 65 io-channel-names = "parent";
75 66
76 mux-controls = <&mux>; 67 mux-controls = <&mux>;
77 channels = "sync", "in", "system-regulat 68 channels = "sync", "in", "system-regulator";
78 }; 69 };
79 ... 70 ...
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.