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

[Pin-yen Lin]

Hi Krzysztof,

Thanks for the review.

On Mon, Nov 28, 2022 at 4:58 AM Krzysztof Kozlowski
<krzysztof.kozlowski at linaro.org> wrote:
>
> 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 at chromium.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 at 1:
> > -        $ref: /schemas/graph.yaml#/properties/port
> > +        $ref: /schemas/graph.yaml#/properties/port-base
>
> I don't understand why you are changing this line.

Without this change, the `unevaluatedProperties: false` in
`/schemas/graph.yaml#/properties/port` does not allow me to add new
properties.
>
> >          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?

What I want to use is something like:
```
items:
  enum: [0,1, 2, 3]
```
That is, all the items should be an integer between 0 and 3. I'll
update this to a stricter version in v7.
>
> > +                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 at 0
> >        - port at 1
> > @@ -186,3 +213,45 @@ examples:
> >              };
> >          };
> >      };
> > +  - |
> > +    &i2c3 {
> > +     anx_bridge_dp: anx7625-dp at 58 {
>
> Messed up indentation.
I'll fix this in the next version.
>
> > +         compatible = "analogix,anx7625
>
> Node names should be generic.
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
I'll update this in v7.
>
> ";
> > +         reg = <0x58>;
>
> Best regards,
> Krzysztof
>

Best regards,
Pin-yen