Re: [PATCH 1/2] dt-bindings: drm/bridge: Add no-hpd property

[Jayesh Choudhary]

Hello Krzysztof,

On 17/03/23 18:08, Krzysztof Kozlowski wrote:
> On 16/03/2023 15:08, Jayesh Choudhary wrote:
> > From: Rahul T R <r-ravikumar@xxxxxx>
> >
> > Add no-hpd property to the bindings, to disable
> > hpd when not connected or unusable
> >
> > Signed-off-by: Rahul T R <r-ravikumar@xxxxxx>
> > Signed-off-by: Jayesh Choudhary <j-choudhary@xxxxxx>
> > ---
> >   .../devicetree/bindings/display/bridge/cdns,mhdp8546.yaml   | 6 ++++++
> >   1 file changed, 6 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
> > index b2e8bc6da9d0..69d381195218 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
> > +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
> > @@ -57,6 +57,12 @@ properties:
> >     interrupts:
> >       maxItems: 1
> >   
> > +  cdns,no-hpd:
>
> There is already no-hpd property.
>
> > +    type: boolean
> > +    description:
> > +      Set if the HPD line on the bridge isn't hooked up to anything or is
> > +      otherwise unusable.
>
> It's the property of the panel, not bridge. Unless you want to say that
> bridge physically does not have HPD? Does it follow the standard in such
> case?

MHDP does have hpd. But the mhdp driver should handle the cases when the
hpd pin of bridge is not connected to that of the DP-connector. This is 
to add support for that. (optional property)

-Jayesh


> Best regards,
> Krzysztof