media: dt-bindings: ov5645: Convert OV5645 binding to a schema

Convert the simple OV5645 Device Tree binding to json-schema.

The previous binding marked the below properties as required which was a
driver requirement and not the device requirement so just drop them from
the required list during the conversion.
- clock-frequency
- enable-gpios
- reset-gpios

Also drop the "clock-names" property as we have a single clock source for
the sensor and the driver has been updated to drop the clk referencing by
name.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/devicetree/bindings/media/i2c/ov5645.txt

-* Omnivision 1/4-Inch 5Mp CMOS Digital Image Sensor
-
-The Omnivision OV5645 is a 1/4-Inch CMOS active pixel digital image sensor with
-an active array size of 2592H x 1944V. It is programmable through a serial I2C
-interface.
-
-Required Properties:
-- compatible: Value should be "ovti,ov5645".
-- clocks: Reference to the xclk clock.
-- clock-names: Should be "xclk".
-- clock-frequency: Frequency of the xclk clock.
-- enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
-  to the hardware pin PWDNB which is physically active low.
-- reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
-  the hardware pin RESETB.
-- vdddo-supply: Chip digital IO regulator.
-- vdda-supply: Chip analog regulator.
-- vddd-supply: Chip digital core regulator.
-
-The device node must contain one 'port' child node for its digital output
-video port, in accordance with the video interface bindings defined in
-Documentation/devicetree/bindings/media/video-interfaces.txt.
-
-Example:
-
-	&i2c1 {
-		...
-
-		ov5645: ov5645@3c {
-			compatible = "ovti,ov5645";
-			reg = <0x3c>;
-
-			enable-gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
-			reset-gpios = <&gpio5 20 GPIO_ACTIVE_LOW>;
-			pinctrl-names = "default";
-			pinctrl-0 = <&camera_rear_default>;
-
-			clocks = <&clks 200>;
-			clock-names = "xclk";
-			clock-frequency = <24000000>;
-
-			vdddo-supply = <&camera_dovdd_1v8>;
-			vdda-supply = <&camera_avdd_2v8>;
-			vddd-supply = <&camera_dvdd_1v2>;
-
-			port {
-				ov5645_ep: endpoint {
-					clock-lanes = <1>;
-					data-lanes = <0 2>;
-					remote-endpoint = <&csi0_ep>;
-				};
-			};
-		};
-	};

Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/ovti,ov5645.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OmniVision OV5645 Image Sensor Device Tree Bindings
+
+maintainers:
+  - Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
+
+properties:
+  compatible:
+    const: ovti,ov5645
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: XCLK Input Clock
+
+  clock-frequency:
+    description: Frequency of the xclk clock in Hz.
+
+  vdda-supply:
+    description: Analog voltage supply, 2.8 volts
+
+  vddd-supply:
+    description: Digital core voltage supply, 1.5 volts
+
+  vdddo-supply:
+    description: Digital I/O voltage supply, 1.8 volts
+
+  enable-gpios:
+    maxItems: 1
+    description:
+      Reference to the GPIO connected to the PWDNB pin, if any.
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      Reference to the GPIO connected to the RESETB pin, if any.
+
+  port:
+    description: Digital Output Port
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    additionalProperties: false
+
+    properties:
+      endpoint:
+        $ref: /schemas/media/video-interfaces.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          data-lanes:
+            minItems: 1
+            maxItems: 2
+            items:
+              enum: [1, 2]
+
+        required:
+          - data-lanes
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - vdddo-supply
+  - vdda-supply
+  - vddd-supply
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        camera@3c {
+            compatible = "ovti,ov5645";
+            reg = <0x3c>;
+            clocks = <&clks 1>;
+            clock-frequency = <24000000>;
+            vdddo-supply = <&ov5645_vdddo_1v8>;
+            vdda-supply = <&ov5645_vdda_2v8>;
+            vddd-supply = <&ov5645_vddd_1v5>;
+            enable-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>;
+            reset-gpios = <&gpio1 20 GPIO_ACTIVE_LOW>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&pinctrl_ov5645>;
+
+            port {
+                ov5645_ep: endpoint {
+                    remote-endpoint = <&csi0_ep>;
+                    data-lanes = <1 2>;
+                };
+            };
+        };
+    };
+...