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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /Documentation/devicetree/bindings/input/rotary-encoder.txt
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+Rotary encoder DT bindings
+
+Required properties:
+- gpios: a spec for two GPIOs to be used
+
+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 rollove when the rotary value becomes
+ greater than the specified steps or smaller than 0. For absolute axis only.
+- rotary-encoder,half-period: Makes the driver work on half-period mode.
+
+See Documentation/input/rotary-encoder.txt 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,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,rollover;
+ };