Rotary encoder DT bindings Required properties: - gpios: a spec for at least two GPIOs to be used, most significant first Optional properties: - linux,axis: the input subsystem axis to map to this rotary encoder. Defaults to 0 (ABS_X / REL_X) - rotary-encoder,steps: Number of steps in a full turnaround of the encoder. Only relevant for absolute axis. Defaults to 24 which is a typical value for such devices. - rotary-encoder,relative-axis: register a relative axis rather than an absolute one. Relative axis will only generate +1/-1 events on the input device, hence no steps need to be passed. - rotary-encoder,rollover: Automatic rollover when the rotary value becomes greater than the specified steps or smaller than 0. For absolute axis only. - rotary-encoder,steps-per-period: Number of steps (stable states) per period. The values have the following meaning: 1: Full-period mode (default) 2: Half-period mode 4: Quarter-period mode - wakeup-source: Boolean, rotary encoder can wake up the system. - rotary-encoder,encoding: String, the method used to encode steps. Supported are "gray" (the default and more common) and "binary". Deprecated properties: - rotary-encoder,half-period: Makes the driver work on half-period mode. This property is deprecated. Instead, a 'steps-per-period ' value should be used, such as "rotary-encoder,steps-per-period = <2>". See Documentation/input/devices/rotary-encoder.rst for more information. Example: rotary@0 { compatible = "rotary-encoder"; gpios = <&gpio 19 1>, <&gpio 20 0>; /* GPIO19 is inverted */ linux,axis = <0>; /* REL_X */ rotary-encoder,encoding = "gray"; rotary-encoder,relative-axis; }; rotary@1 { compatible = "rotary-encoder"; gpios = <&gpio 21 0>, <&gpio 22 0>; linux,axis = <1>; /* ABS_Y */ rotary-encoder,steps = <24>; rotary-encoder,encoding = "binary"; rotary-encoder,rollover; };