linux-kernel - Re: [PATCH v6 3/7] dt-bindings: drm/bridge: anx7625: Add mode-switch support

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Date:   Sun, 27 Nov 2022 21:58:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Pin-yen Lin <treapking@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Stephen Boyd <swboyd@...omium.org>,
        dri-devel@...ts.freedesktop.org,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        devicetree@...r.kernel.org, chrome-platform@...ts.linux.dev,
        linux-acpi@...r.kernel.org, Marek Vasut <marex@...x.de>,
        Xin Ji <xji@...logixsemi.com>, Lyude Paul <lyude@...hat.com>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-kernel@...r.kernel.org, Allen Chen <allen.chen@....com.tw>
Subject: Re: [PATCH v6 3/7] dt-bindings: drm/bridge: anx7625: Add mode-switch
 support

On 24/11/2022 11:20, Pin-yen Lin wrote:
> Analogix 7625 can be used in systems to switch the DP traffic between
> two downstreams, which can be USB Type-C DisplayPort alternate mode
> lane or regular DisplayPort output ports.
> 
> Update the binding to accommodate this usage by introducing a
> data-lanes and a mode-switch property on endpoints.
> 
> Also include the link to the product brief in the bindings.
> 
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> 
> ---
> 
> Changes in v6:
> - Remove switches node and use endpoints and data-lanes property to
>   describe the connections.

Except missing testing few things...

> 
>  .../display/bridge/analogix,anx7625.yaml      | 73 ++++++++++++++++++-
>  1 file changed, 71 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> index 4590186c4a0b..5fdbf1f3bab8 100644
> --- a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> @@ -12,7 +12,8 @@ maintainers:
>  
>  description: |
>    The ANX7625 is an ultra-low power 4K Mobile HD Transmitter
> -  designed for portable devices.
> +  designed for portable devices. Product brief is available at
> +  https://www.analogix.com/en/system/files/AA-002291-PB-6-ANX7625_ProductBrief.pdf
>  
>  properties:
>    compatible:
> @@ -112,10 +113,36 @@ properties:
>                data-lanes: true
>  
>        port@1:
> -        $ref: /schemas/graph.yaml#/properties/port
> +        $ref: /schemas/graph.yaml#/properties/port-base

I don't understand why you are changing this line.

>          description:
>            Video port for panel or connector.
>  
> +        patternProperties:
> +          "^endpoint@[01]$":
> +            $ref: /schemas/media/video-interfaces.yaml#
> +            type: object
> +            unevaluatedProperties: false
> +
> +            properties:
> +              reg:
> +                maxItems: 1
> +
> +              remote-endpoint: true
> +
> +              data-lanes:
> +                minItems: 1
> +                uniqueItems: true

These are confusing... you allow only one item, so why minItems and
uniqueItems?

> +                items:
> +                  - enum: [ 0, 1, 2, 3]
> +
> +              mode-switch:
> +                type: boolean
> +                description: Register this node as a Type-C mode switch or not.
> +
> +            required:
> +              - reg
> +              - remote-endpoint
> +
>      required:
>        - port@0
>        - port@1
> @@ -186,3 +213,45 @@ examples:
>              };
>          };
>      };
> +  - |
> +    &i2c3 {
> +	anx_bridge_dp: anx7625-dp@58 {

Messed up indentation.

> +	    compatible = "analogix,anx7625

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

";
> +	    reg = <0x58>;

Best regards,
Krzysztof