xref: /freebsd/sys/contrib/device-tree/Bindings/mux/gpio-mux.yaml (revision 8bab661a3316d8bd9b9fbd11a3b4371b91507bd2)

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/mux/gpio-mux.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: GPIO-based multiplexer controller

maintainers:
  - Peter Rosin <peda@axentia.se>

description: |+
  Define what GPIO pins are used to control a multiplexer. Or several
  multiplexers, if the same pins control more than one multiplexer.

  The multiplexer state is defined as the number represented by the
  multiplexer GPIO pins, where the first pin is the least significant
  bit. An active pin is a binary 1, an inactive pin is a binary 0.

properties:
  compatible:
    const: gpio-mux

  mux-gpios:
    description:
      List of gpios used to control the multiplexer, least significant bit first.

  '#mux-control-cells':
    enum: [ 0, 1 ]

  '#mux-state-cells':
    enum: [ 1, 2 ]

  idle-state:
    default: -1

required:
  - compatible
  - mux-gpios
anyOf:
  - required:
      - "#mux-control-cells"
  - required:
      - "#mux-state-cells"

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-1", "in", "out", "sync-2";
    };

    i2c-mux {
        compatible = "i2c-mux";
        i2c-parent = <&i2c1>;

        mux-controls = <&mux>;

        #address-cells = <1>;
        #size-cells = <0>;

        i2c@0 {
            reg = <0>;
            #address-cells = <1>;
            #size-cells = <0>;

            ssd1307: oled@3c {
                reg = <0x3c>;
            };
        };

        i2c@3 {
            reg = <3>;
            #address-cells = <1>;
            #size-cells = <0>;

            pca9555: pca9555@20 {
                reg = <0x20>;
            };
        };
    };
...