On Sun, Mar 01, 2020 at 04:09:19PM +0100, Artur Rojek wrote: > Add documentation for the adc-joystick driver, used to provide support > for joysticks connected over ADC. > > Signed-off-by: Artur Rojek <contact@xxxxxxxxxxxxxx> > Tested-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx> > --- > > Changes: > > v2: - Add `reg` property to axis subnode in order to enumerate the axes, > - rename `linux,abs-code` property to `linux,code`, > - drop `linux,` prefix from the remaining properties of axis subnode > > v3: no change > > .../bindings/input/adc-joystick.yaml | 117 ++++++++++++++++++ > 1 file changed, 117 insertions(+) > create mode 100644 Documentation/devicetree/bindings/input/adc-joystick.yaml > > diff --git a/Documentation/devicetree/bindings/input/adc-joystick.yaml b/Documentation/devicetree/bindings/input/adc-joystick.yaml > new file mode 100644 > index 000000000000..91fc87dcbddb > --- /dev/null > +++ b/Documentation/devicetree/bindings/input/adc-joystick.yaml > @@ -0,0 +1,117 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +# Copyright 2019-2020 Artur Rojek > +%YAML 1.2 > +--- > +$id: "http://devicetree.org/schemas/bindings/input/adc-joystick.yaml#"; Drop 'bindings'. > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"; > + > +title: ADC attached joystick > + > +maintainers: > + - Artur Rojek <contact@xxxxxxxxxxxxxx> > + > +description: | > + Bindings for joystick devices connected to ADC controllers supporting > + the Industrial I/O subsystem. > + > +properties: > + compatible: > + const: adc-joystick > + > + io-channels: > + description: | > + List of phandle and IIO specifier pairs. > + Each pair defines one ADC channel to which a joystick axis is connected. > + See Documentation/devicetree/bindings/iio/iio-bindings.txt for details. How many? > + > + '#address-cells': > + const: 1 > + > + '#size-cells': > + const: 0 > + > +required: > + - compatible > + - io-channels > + - '#address-cells' > + - '#size-cells' > + > +additionalProperties: false > + > +patternProperties: > + "^axis@([0-9])$": Up to 10 axis? > + type: object > + description: | > + Represents a joystick axis bound to the given ADC channel. > + For each entry in the io-channels list, one axis subnode with a matching > + reg property must be specified. > + > + properties: > + reg: > + items: > + description: Index of an io-channels list entry bound to this axis. reg: enum: [ 0, 1 ] Or use minimum/maximum > + > + linux,code: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: EV_ABS specific event code generated by the axis. > + > + abs-range: > + $ref: /schemas/types.yaml#/definitions/uint32-array Needs to be under an 'allOf'. > + items: > + - description: minimum value > + - description: maximum value > + description: | > + Minimum and maximum values produced by the axis. > + For an ABS_X axis this will be the left-most and right-most > + inclination of the joystick. If min > max, it is left to userspace to > + treat the axis as inverted. > + This property is interpreted as two signed 32 bit values. > + > + abs-fuzz: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: | > + Amount of noise in the input value. > + Omitting this property indicates the axis is precise. > + > + abs-flat: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: | > + Axial "deadzone", or area around the center position, where the axis > + is considered to be at rest. > + Omitting this property indicates the axis always returns to exactly > + the center position. > + > + required: > + - reg > + - linux,code > + - abs-range > + > + additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/iio/adc/ingenic,adc.h> > + #include <dt-bindings/input/input.h> > + > + joystick: adc-joystick { > + compatible = "adc-joystick"; > + io-channels = <&adc INGENIC_ADC_TOUCH_XP>, > + <&adc INGENIC_ADC_TOUCH_YP>; > + #address-cells = <1>; > + #size-cells = <0>; > + > + axis@0 { > + reg = <0>; > + linux,code = <ABS_X>; > + abs-range = <3300 0>; > + abs-fuzz = <4>; > + abs-flat = <200>; > + }; > + axis@1 { > + reg = <1>; > + linux,code = <ABS_Y>; > + abs-range = <0 3300>; > + abs-fuzz = <4>; > + abs-flat = <200>; > + }; > + }; > -- > 2.25.1 >
