media: dt-bindings: media: add TI DS90UB953 FPD-Link III Serializer

Add DT bindings for TI DS90UB953 FPD-Link III Serializer.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.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/ti,ds90ub953.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/ti,ds90ub953.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments DS90UB953 FPD-Link III Serializer
+
+maintainers:
+  - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+
+description:
+  The TI DS90UB953 is an FPD-Link III video serializer for MIPI CSI-2.
+
+properties:
+  compatible:
+    enum:
+      - ti,ds90ub953-q1
+      - ti,ds90ub971-q1
+
+  '#gpio-cells':
+    const: 2
+    description:
+      First cell is the GPIO pin number, second cell is the flags. The GPIO pin
+      number must be in range of [0, 3].
+
+  gpio-controller: true
+
+  clocks:
+    maxItems: 1
+    description:
+      Reference clock connected to the CLKIN pin.
+
+  clock-names:
+    items:
+      - const: clkin
+
+  '#clock-cells':
+    const: 0
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: CSI-2 input port
+
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+
+            required:
+              - data-lanes
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        unevaluatedProperties: false
+        description: FPD-Link III output port
+
+    required:
+      - port@0
+      - port@1
+
+  i2c:
+    $ref: /schemas/i2c/i2c-controller.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - '#gpio-cells'
+  - gpio-controller
+  - '#clock-cells'
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    serializer {
+      compatible = "ti,ds90ub953-q1";
+
+      gpio-controller;
+      #gpio-cells = <2>;
+
+      #clock-cells = <0>;
+
+      ports {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        port@0 {
+          reg = <0>;
+          ub953_in: endpoint {
+            clock-lanes = <0>;
+            data-lanes = <1 2 3 4>;
+            remote-endpoint = <&sensor_out>;
+          };
+        };
+
+        port@1 {
+          reg = <1>;
+          endpoint {
+            remote-endpoint = <&deser_fpd_in>;
+          };
+        };
+      };
+
+      i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        sensor@1a {
+          compatible = "sony,imx274";
+          reg = <0x1a>;
+
+          reset-gpios = <&serializer 0 GPIO_ACTIVE_LOW>;
+
+          clocks = <&serializer>;
+          clock-names = "inck";
+
+          port {
+            sensor_out: endpoint {
+              remote-endpoint = <&ub953_in>;
+            };
+          };
+        };
+      };
+    };
+...