* GPIO Decoder DT bindings Required Properties:- compatible: should be "gpio-decoder"- gpios: a spec of gpios (at least two) to be decoded to a number with  first entry representing the MSB. Optional Properties:- decoder-max-value: Maximum possible value that can be reported by  the gpios.- linux,axis: the input subsystem axis to map to (ABS_X/ABS_Y).  Defaults to 0 (ABS_X). Example:	gpio-decoder0 {		compatible = "gpio-decoder";		gpios = <&pca9536 3 GPIO_ACTIVE_HIGH>,			<&pca9536 2 GPIO_ACTIVE_HIGH>,			<&pca9536 1 GPIO_ACTIVE_HIGH>,			<&pca9536 0 GPIO_ACTIVE_HIGH>;		linux,axis = <0>; /* ABS_X */		decoder-max-value = <9>;	};