On Fri, Sep 10, 2021 at 08:41:30PM +0200, Paul Kocialkowski wrote:
> The A31 CSI controller supports two distinct input interfaces:
> parallel and an external MIPI CSI-2 bridge. The parallel interface
> is often connected to a set of hardware pins while the MIPI CSI-2
> bridge is an internal FIFO-ish link. As a result, these two inputs
> are distinguished as two different ports.
> 
> Note that only one of the two may be present on a controller instance.
> For example, the V3s has one controller dedicated to MIPI-CSI2 and one
> dedicated to parallel.
> 
> Update the binding with an explicit ports node that holds two distinct
> port nodes: one for parallel input and one for MIPI CSI-2.
> 
> This is backward-compatible with the single-port approach that was
> previously taken for representing the parallel interface port, which
> stays enumerated as fwnode port 0.
> 
> Note that additional ports may be added in the future, especially to
> support feeding the CSI controller's output to the ISP.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Acked-by: Maxime Ripard <mripard@kernel.org>
> ---
>  .../media/allwinner,sun6i-a31-csi.yaml        | 75 +++++++++++++++----
>  1 file changed, 62 insertions(+), 13 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
> index 8b568072a069..f4a686b77a38 100644
> --- a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
> +++ b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
> @@ -61,6 +61,49 @@ properties:
>  
>      additionalProperties: false
>  
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        description: Parallel input port, connect to a parallel sensor
> +
> +        properties:
> +          reg:
> +            const: 0
> +
> +          endpoint:
> +            $ref: video-interfaces.yaml#
> +            unevaluatedProperties: false
> +
> +            properties:
> +              bus-width:
> +                enum: [ 8, 10, 12, 16 ]
> +
> +              pclk-sample: true
> +              hsync-active: true
> +              vsync-active: true
> +
> +            required:
> +              - bus-width
> +
> +        additionalProperties: false

You don't have to duplicate the entire definition there, you can just
reference port:

$ref: #/properties/port

> +      port@1:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        description: MIPI CSI-2 bridge input port
> +
> +        properties:
> +          reg:
> +            const: 1
> +
> +          endpoint:
> +            $ref: video-interfaces.yaml#
> +            unevaluatedProperties: false
> +
> +        additionalProperties: false
> +

port@0 is required?

And at the top-level, either ports or port are required too

>  required:
>    - compatible
>    - reg
> @@ -89,19 +132,25 @@ examples:
>                        "ram";
>          resets = <&ccu RST_BUS_CSI>;
>  
> -        port {
> -            /* Parallel bus endpoint */
> -            csi1_ep: endpoint {
> -                remote-endpoint = <&adv7611_ep>;
> -                bus-width = <16>;
> -
> -                /*
> -                 * If hsync-active/vsync-active are missing,
> -                 * embedded BT.656 sync is used.
> -                 */
> -                 hsync-active = <0>; /* Active low */
> -                 vsync-active = <0>; /* Active low */
> -                 pclk-sample = <1>;  /* Rising */
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +                /* Parallel bus endpoint */
> +                csi1_ep: endpoint {
> +                    remote-endpoint = <&adv7611_ep>;
> +                    bus-width = <16>;
> +
> +                    /*
> +                     * If hsync-active/vsync-active are missing,
> +                     * embedded BT.656 sync is used.
> +                     */
> +                     hsync-active = <0>; /* Active low */
> +                     vsync-active = <0>; /* Active low */
> +                     pclk-sample = <1>;  /* Rising */
> +                };
>              };
>          };
>      };

I'd keep the original example and add one with the CSI bridge

Maxime