Documentation/devicetree/bindings/input/gpio-decoder.txt

   1 * GPIO Decoder DT bindings
   2
   3 Required Properties:
   4 - compatible: should be "gpio-decoder"
   5 - gpios: a spec of gpios (at least two) to be decoded to a number with
   6   first entry representing the MSB.
   7
   8 Optional Properties:
   9 - decoder-max-value: Maximum possible value that can be reported by
  10   the gpios.
  11 - linux,axis: the input subsystem axis to map to (ABS_X/ABS_Y).
  12   Defaults to 0 (ABS_X).
  13
  14 Example:
  15         gpio-decoder0 {
  16                 compatible = "gpio-decoder";
  17                 gpios = <&pca9536 3 GPIO_ACTIVE_HIGH>,
  18                         <&pca9536 2 GPIO_ACTIVE_HIGH>,
  19                         <&pca9536 1 GPIO_ACTIVE_HIGH>,
  20                         <&pca9536 0 GPIO_ACTIVE_HIGH>;
  21                 linux,axis = <0>; /* ABS_X */
  22                 decoder-max-value = <9>;
  23         };