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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/multiplexer/io-channel-mux.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: I/O channel multiplexer bindings
maintainers:
- Peter Rosin <peda@axentia.se>
description: |
If a multiplexer is used to select which hardware signal is fed to
e.g. an ADC channel, these bindings describe that situation.
For each non-empty string in the channels property, an io-channel will be
created. The number of this io-channel is the same as the index into the list
of strings in the channels property, and also matches the mux controller
state. The mux controller state is described in
Documentation/devicetree/bindings/mux/mux-controller.yaml
properties:
compatible:
const: io-channel-mux
io-channels:
maxItems: 1
description: Channel node of the parent channel that has multiplexed input.
io-channel-names:
const: parent
mux-controls: true
mux-control-names: true
channels:
$ref: /schemas/types.yaml#/definitions/non-unique-string-array
description:
List of strings, labeling the mux controller states. An empty
string for a state means that the channel is not available.
settle-time-us:
default: 0
description:
Time required for analog signals to settle after muxing.
"#io-channel-cells":
const: 1
required:
- compatible
- io-channels
- io-channel-names
- mux-controls
- channels
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
mux: mux-controller {
compatible = "gpio-mux";
#mux-control-cells = <0>;
mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
<&pioA 1 GPIO_ACTIVE_HIGH>;
};
adc-mux {
compatible = "io-channel-mux";
io-channels = <&adc 0>;
io-channel-names = "parent";
mux-controls = <&mux>;
channels = "sync", "in", "system-regulator";
};
...
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