media: dt-bindings: media: i2c: Add bindings for TW9900

The Techwell TW9900 is a video decoder supporting multiple input
standards such as PAL and NTSC and has a parallel BT.656 output
interface.

It's designed to be low-power, posesses some features such as a
programmable comb-filter, and automatic input standard detection
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mehdi Djait <mehdi.djait@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/techwell,tw9900.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Techwell TW9900 NTSC/PAL video decoder
+
+maintainers:
+  - Mehdi Djait <mehdi.djait@bootlin.com>
+
+description:
+  The tw9900 is a multi-standard video decoder, supporting NTSC, PAL standards
+  with auto-detection features.
+
+properties:
+  compatible:
+    const: techwell,tw9900
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description: VDD power supply
+
+  reset-gpios:
+    description: GPIO descriptor for the RESET input pin
+    maxItems: 1
+
+  powerdown-gpios:
+    description: GPIO descriptor for the POWERDOWN input pin
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        description: Analog input port
+
+        properties:
+          endpoint@0:
+            $ref: /schemas/graph.yaml#/properties/endpoint
+            description: CVBS over MUX0
+
+          endpoint@1:
+            $ref: /schemas/graph.yaml#/properties/endpoint
+            description: CVBS over MUX1
+
+          endpoint@2:
+            $ref: /schemas/graph.yaml#/properties/endpoint
+            description: Chroma over CIN0 and Y over MUX0
+
+          endpoint@3:
+            $ref: /schemas/graph.yaml#/properties/endpoint
+            description: Chroma over CIN0 and Y over MUX1
+
+        oneOf:
+          - required:
+              - endpoint@0
+          - required:
+              - endpoint@1
+          - required:
+              - endpoint@2
+          - required:
+              - endpoint@3
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for the decoder output.
+
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - ports
+  - reg
+  - vdd-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/display/sdtv-standards.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    composite_connector {
+        compatible = "composite-video-connector";
+        label = "tv";
+        sdtv-standards = <(SDTV_STD_PAL | SDTV_STD_NTSC)>;
+
+        port {
+            composite_to_tw9900: endpoint {
+                remote-endpoint = <&tw9900_to_composite>;
+            };
+        };
+    };
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        video-decoder@44 {
+            compatible = "techwell,tw9900";
+            reg = <0x44>;
+
+            vdd-supply = <&tw9900_supply>;
+            reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    #address-cells = <1>;
+                    #size-cells = <0>;
+
+                    reg = <0>;
+                    tw9900_to_composite: endpoint@0 {
+                        reg = <0>;
+                        remote-endpoint = <&composite_to_tw9900>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    endpoint {
+                        remote-endpoint = <&cif_in>;
+                    };
+                };
+            };
+        };
+    };