On Fri, Feb 17, 2023 at 03:57:30PM +0100, Angelo Compagnucci wrote: > This binding describes the binding for controlling servo motors through > pwm. > > Signed-off-by: Angelo Compagnucci <angelo@xxxxxxxxxxxxxxxxxxxx> > --- > .../devicetree/bindings/misc/servo-pwm.yaml | 59 +++++++++++++++++++ > MAINTAINERS | 1 + > 2 files changed, 60 insertions(+) > create mode 100644 Documentation/devicetree/bindings/misc/servo-pwm.yaml > > diff --git a/Documentation/devicetree/bindings/misc/servo-pwm.yaml b/Documentation/devicetree/bindings/misc/servo-pwm.yaml > new file mode 100644 > index 000000000000..faa8d4734817 > --- /dev/null > +++ b/Documentation/devicetree/bindings/misc/servo-pwm.yaml > @@ -0,0 +1,59 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/misc/servo-pwm.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Servo motor connected to PWM > + > +maintainers: > + - Angelo Compagnucci <angelo@xxxxxxxxxxxxxxxxxxxx> > + > +description: > + Each servo is represented as a servo-pwm device. > + The 20ms period is the accepted standard and so most of the motors > + support it, while the positioning min/max duty cycle or the motor > + degrees aperture vary lot between manufacturers. > + The most common type of servo (SG90) has 180 degrees of movement > + and moves between 0.5ms and 2.5ms duty cycle. > + > +properties: > + compatible: > + const: servo-pwm > + > +patternProperties: > + properties: > + pwms: > + maxItems: 1 > + > + pwm-names: true Drop. '-names' is for when there is more than 1. > + > + degrees: Kind of vague: servo-degrees > + description: > + How many degrees the motor can move. > + $ref: /schemas/types.yaml#/definitions/uint32 0-2^32 are valid degrees? > + > + duty-min: > + description: > + Duty cycle for position the motor at 0 degrees. Units are ms? percent? Use standard unit suffix. > + $ref: /schemas/types.yaml#/definitions/uint32 > + > + duty-max: > + description: > + Duty cycle for positioning the motor at "degrees" angle. > + $ref: /schemas/types.yaml#/definitions/uint32 > + > +additionalProperties: false > + > +examples: > + - | > + > + servo: servo@0 { > + compatible = "servo-pwm"; > + pwms = <&pwm 0 20000000 0>; > + degrees = <180>; > + duty-min = <500000>; > + duty-max = <2500000>; > + }; > + > +... > diff --git a/MAINTAINERS b/MAINTAINERS > index 356daea0861d..8f41daee62fc 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -8742,6 +8742,7 @@ M: "Angelo Compagnucci" <angelo@xxxxxxxxxxxxxxxxxxxx> > L: linux-pwm@xxxxxxxxxxxxxxx > S: Maintained > F: Documentation/ABI/testing/sysfs-driver-servo-pwm > +F: Documentation/devicetree/bindings/misc/servo-pwm.yaml > F: drivers/misc/servo-pwm.c > > GENERIC RESISTIVE TOUCHSCREEN ADC DRIVER > -- > 2.34.1 >
