linux-kernel - [PATCH v2 3/3] dt-bindings: leds: servo-pwm: Add new bindings for servo-pwm

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Message-Id: <20230217145731.3018148-3-angelo@amarulasolutions.com>
Date:   Fri, 17 Feb 2023 15:57:30 +0100
From:   Angelo Compagnucci <angelo.compagnucci@...il.com>
To:     Angelo Compagnucci <angelo@...rulasolutions.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] dt-bindings: leds: servo-pwm: Add new bindings for servo-pwm

This binding describes the binding for controlling servo motors through
pwm.

Signed-off-by: Angelo Compagnucci <angelo@...rulasolutions.com>
---
 .../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@...rulasolutions.com>
+
+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
+
+    degrees:
+      description:
+        How many degrees the motor can move.
+      $ref: /schemas/types.yaml#/definitions/uint32
+
+    duty-min:
+      description:
+        Duty cycle for position the motor at 0 degrees.
+      $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@...rulasolutions.com>
 L:	linux-pwm@...r.kernel.org
 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