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

   1* GPIO Decoder DT bindings
   2
   3Required 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
   8Optional 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
  14Example:
  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        };
  24