Bindings/mux/gpio-mux.yaml

   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
   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 ...