mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 20:01:35 +07:00
80c99bcd28
This adds devicetree bindings to the rotary encoder driver and some documentation about how to use them. Tested on a PXA3xx platform. Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
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;
|
|
};
|