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[karo-tx-linux.git] / Documentation / devicetree / bindings / input / rotary-encoder.txt
1 Rotary encoder DT bindings
2
3 Required properties:
4 - gpios: a spec for two GPIOs to be used
5
6 Optional properties:
7 - linux,axis: the input subsystem axis to map to this rotary encoder.
8   Defaults to 0 (ABS_X / REL_X)
9 - rotary-encoder,steps: Number of steps in a full turnaround of the
10   encoder. Only relevant for absolute axis. Defaults to 24 which is a
11   typical value for such devices.
12 - rotary-encoder,relative-axis: register a relative axis rather than an
13   absolute one. Relative axis will only generate +1/-1 events on the input
14   device, hence no steps need to be passed.
15 - rotary-encoder,rollover: Automatic rollove when the rotary value becomes
16   greater than the specified steps or smaller than 0. For absolute axis only.
17 - rotary-encoder,half-period: Makes the driver work on half-period mode.
18
19 See Documentation/input/rotary-encoder.txt for more information.
20
21 Example:
22
23                 rotary@0 {
24                         compatible = "rotary-encoder";
25                         gpios = <&gpio 19 1>, <&gpio 20 0>; /* GPIO19 is inverted */
26                         linux,axis = <0>; /* REL_X */
27                         rotary-encoder,relative-axis;
28                 };
29
30                 rotary@1 {
31                         compatible = "rotary-encoder";
32                         gpios = <&gpio 21 0>, <&gpio 22 0>;
33                         linux,axis = <1>; /* ABS_Y */
34                         rotary-encoder,steps = <24>;
35                         rotary-encoder,rollover;
36                 };