gpio-mux.yaml

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

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/mux/gpio-mux.yaml

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sys/contrib/device-tree/Bindings/mux/gpio-mux.yaml