dt-bindings: media: i2c : Add ISX021 documentation

Add YAML doccumentation

Signed-off-by: Bogdan Togorean <bogdan.togorean@analog.com>

Author: btogorean

Documentation/devicetree/bindings/media/i2c/sony,isx021.yaml

@@ -0,0 +1,108 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/sony,isx021.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sony 1/2.57-inch 2.51MP CMOS Digital Image Sensor
+
+maintainers:
+  - Bogdan Togorean <bogdan.togorean@analog.com>
+
+description: |
+  The Sony ISX021 is a 1/2.57-inch CMOS active pixel digital image sensor.
+  It is programmable through an I2C interface. Image data is sent through MIPI CSI-2,
+  through 2 or 4 lanes.
+
+allOf:
+  - $ref: ../video-interface-devices.yaml#
+
+properties:
+  compatible:
+    const: sony,isx021
+
+  reg:
+    enum:
+      - 0x1a
+
+  clocks:
+    description: Reference to the xclk clock.
+    maxItems: 1
+
+  reset-gpios:
+    description: GPIO descriptor for the reset pin.
+    maxItems: 1
+
+  dvdd-supply:
+    description: Chip digital IO regulator (1.8V).
+
+  port:
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    description: |
+      Video output port.
+
+    properties:
+      endpoint:
+        $ref: /schemas/media/video-interfaces.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          data-lanes:
+            anyOf:
+              - items:
+                  - const: 1
+                  - const: 2
+              - items:
+                  - const: 1
+                  - const: 2
+                  - const: 3
+                  - const: 4
+
+          clock-lanes:
+            anyOf:
+              - items:
+                  - const: 0
+
+        required:
+          - data-lanes
+          - link-frequencies
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - reset-gpios
+  - dvdd-supply
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        camera-sensor@1a {
+            compatible = "sony,isx021";
+            reg = <0x1a>;
+            dvdd-supply = <&1v8_reg>;
+            reset-gpios = <&ISX021_SER_LABEL 8 GPIO_ACTIVE_LOW>;
+            clocks = <&camera_clk>;
+            clock-names = "xclk";
+
+            port {
+                isx021_ep: endpoint {
+                    clock-lanes = <0>;
+                    data-lanes = <1 2 3 4>;
+                    remote-endpoint = <&csiphy0_ep>;
+                };
+            };
+        };
+    };
+
+...