The Techwell TW9900 is a video decoder supporting multiple input
standards, such as PAL and NTSC, and outputs a BT.656 video
signal.

It's designed to be low-power, posesses some features such as a
programmable comb-filter, and automatic input standard detection

Signed-off-by: Mehdi Djait <mehdi.djait@bootlin.com>
---
V6->V7: 
- added powerdown-gpios and input ports
- used 4 spaces for example identation

V5->V6: 
- This commit had a "Reviewed-by: Rob Herring <robh@kernel.org>" Tag but
  decided not to collect it because the last Iteration was more than 2
  years ago
- removed SECAM from the mentioned standards
- changed maintainer

V4->V5: 
- renamed the file to match the compatible string, and referenced
  the graph.yaml schema

V3->V4: 
- add the missing reset-gpios node to the binding

V2->V3: 
- fix the example not compiling due to a typo in the reset-gpios
  node.

 .../bindings/media/i2c/techwell,tw9900.yaml   | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml b/Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml
new file mode 100644
index 000000000000..244289a9a3e0
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml
@@ -0,0 +1,82 @@
+# 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@3:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for the decoder output.
+
+    patternProperties:
+      "^port@[0-2]$":
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Analog video input port.
+
+    required:
+      - port@3
+
+required:
+  - compatible
+  - ports
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    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@3 {
+                    reg = <3>;
+                    endpoint {
+                        remote-endpoint = <&vip_in>;
+                    };
+                };
+            };
+        };
+    };
-- 
2.41.0

On Mon, Oct 16, 2023 at 03:58:32PM +0200, Mehdi Djait wrote:
> The Techwell TW9900 is a video decoder supporting multiple input
> standards, such as PAL and NTSC, and outputs a BT.656 video
> signal.
> 
> It's designed to be low-power, posesses some features such as a
> programmable comb-filter, and automatic input standard detection
> 
> Signed-off-by: Mehdi Djait <mehdi.djait@bootlin.com>
> ---
> V6->V7: 
> - added powerdown-gpios and input ports
> - used 4 spaces for example identation
> 
> V5->V6: 
> - This commit had a "Reviewed-by: Rob Herring <robh@kernel.org>" Tag but
>   decided not to collect it because the last Iteration was more than 2
>   years ago
> - removed SECAM from the mentioned standards
> - changed maintainer
> 
> V4->V5: 
> - renamed the file to match the compatible string, and referenced
>   the graph.yaml schema
> 
> V3->V4: 
> - add the missing reset-gpios node to the binding
> 
> V2->V3: 
> - fix the example not compiling due to a typo in the reset-gpios
>   node.
> 
>  .../bindings/media/i2c/techwell,tw9900.yaml   | 82 +++++++++++++++++++
>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml b/Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml
> new file mode 100644
> index 000000000000..244289a9a3e0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/techwell,tw9900.yaml
> @@ -0,0 +1,82 @@
> +# 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@3:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Video port for the decoder output.
> +
> +    patternProperties:
> +      "^port@[0-2]$":
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Analog video input port.

You need to define each port (0, 1, 2). Are those each component or 
composite, s-video, and component? The latter would make more sense as I 
don't think there would be a need to route each component to different 
place. It's logically just 1 stream.

> +
> +    required:
> +      - port@3
> +
> +required:
> +  - compatible
> +  - ports
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    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@3 {
> +                    reg = <3>;
> +                    endpoint {
> +                        remote-endpoint = <&vip_in>;
> +                    };
> +                };
> +            };
> +        };
> +    };
> -- 
> 2.41.0
>

On Mon, Oct 16, 2023 at 03:58:32PM +0200, Mehdi Djait wrote:
> The Techwell TW9900 is a video decoder supporting multiple input
> standards, such as PAL and NTSC, and outputs a BT.656 video
> signal.
> 
> It's designed to be low-power, posesses some features such as a
> programmable comb-filter, and automatic input standard detection
> 
> Signed-off-by: Mehdi Djait <mehdi.djait@bootlin.com>

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>

Thanks,
Conor.