dt-bindings: media: i2c: Add DW9718S, DW9719 and DW9761 VCM

Document Dongwoon DW9718S, DW9719 and DW9761 VCM devicetree bindings.

Signed-off-by: André Apitzsch <git@apitzsch.eu>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

diff --git a/Documentation/devicetree/bindings/media/i2c/dongwoon,dw9719.yaml b/Documentation/devicetree/bindings/media/i2c/dongwoon,dw9719.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/dongwoon,dw9719.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Dongwoon Anatech DW9719 Voice Coil Motor (VCM) Controller
+
+maintainers:
+  - André Apitzsch <git@apitzsch.eu>
+
+description:
+  The Dongwoon DW9718S/9719/9761 is a single 10-bit digital-to-analog converter
+  with 100 mA output current sink capability, designed for linear control of
+  voice coil motors (VCM) in camera lenses. This chip provides a Smart Actuator
+  Control (SAC) mode intended for driving voice coil lenses in camera modules.
+
+properties:
+  compatible:
+    enum:
+      - dongwoon,dw9718s
+      - dongwoon,dw9719
+      - dongwoon,dw9761
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description: VDD power supply
+
+  dongwoon,sac-mode:
+    description: |
+      Slew Rate Control mode to use: direct, LSC (Linear Slope Control) or
+      SAC1-SAC6 (Smart Actuator Control).
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum:
+      - 0   # Direct mode
+      - 1   # LSC mode
+      - 2   # SAC1 mode (operation time# 0.32 x Tvib)
+      - 3   # SAC2 mode (operation time# 0.48 x Tvib)
+      - 4   # SAC3 mode (operation time# 0.72 x Tvib)
+      - 5   # SAC4 mode (operation time# 1.20 x Tvib)
+      - 6   # SAC5 mode (operation time# 1.64 x Tvib)
+      - 7   # SAC6 mode (operation time# 1.88 x Tvib)
+    default: 4
+
+  dongwoon,vcm-prescale:
+    description:
+      Indication of VCM switching frequency dividing rate select.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: dongwoon,dw9718s
+    then:
+      properties:
+        dongwoon,vcm-prescale:
+          description:
+            The final frequency is 10 MHz divided by (value + 2).
+          maximum: 15
+          default: 0
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        actuator@c {
+            compatible = "dongwoon,dw9718s";
+            reg = <0x0c>;
+
+            vdd-supply = <&pm8937_l17>;
+
+            dongwoon,sac-mode = <4>;
+            dongwoon,vcm-prescale = <0>;
+        };
+    };