Re: [PATCH v2 06/19] dt-bindings: media: sun6i-a31-csi: Add MIPI CSI-2 input port

[Paul Kocialkowski]

Hi,

On Tue 01 Dec 20, 11:43, Maxime Ripard wrote:
> On Sat, Nov 28, 2020 at 03:28:26PM +0100, 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. However, it is now marked as
> > deprecated and the multi-port approach should be preferred.
> > 
> > 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@xxxxxxxxxxx>
> > ---
> >  .../media/allwinner,sun6i-a31-csi.yaml        | 86 ++++++++++++++++---
> >  1 file changed, 73 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 1fd9b5532a21..3bcee2d44f3c 100644
> > --- a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
> > +++ b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
> > @@ -43,6 +43,7 @@ properties:
> >    # See ./video-interfaces.txt for details
> >    port:
> >      type: object
> > +    deprecated: true
> 
> I'm not sure we want to deprecate it. There's some SoCs with the same
> controller but without the MIPI-CSI block where this would be completely
> valid

I think we'll need to deprecate it when adding support for the ISP anyway,
so I figured we might as well do it now. But I'm okay to postpone this for now.

> >      properties:
> >        endpoint:
> > @@ -67,6 +68,59 @@ properties:
> >  
> >      additionalProperties: false
> >  
> > +  ports:
> > +    type: object
> > +
> > +    properties:
> > +      port@0:
> > +        type: object
> > +        description: Parallel input port, connect to a parallel sensor
> > +
> > +        properties:
> > +          reg:
> > +            const: 0
> > +
> > +          endpoint:
> > +            type: object
> > +
> > +            properties:
> > +              remote-endpoint: true
> > +
> > +              bus-width:
> > +                enum: [ 8, 10, 12, 16 ]
> > +
> > +              pclk-sample: true
> > +              hsync-active: true
> > +              vsync-active: true
> > +
> > +            required:
> > +              - bus-width
> > +              - remote-endpoint
> > +
> > +        required:
> > +          - endpoint
> > +
> > +        additionalProperties: false
> > +
> > +      port@1:
> > +        type: object
> > +        description: MIPI CSI-2 bridge input port
> > +
> > +        properties:
> > +          reg:
> > +            const: 1
> > +
> > +          endpoint:
> > +            type: object
> > +
> > +            properties:
> > +              remote-endpoint: true
> > +
> > +            required:
> > +              - remote-endpoint
> > +
> > +        additionalProperties: false
> 
> There's a schema for the OF-graph now, you'll want to use it.

I didn't know that, thanks for the tip! Will look into it.

Cheers,

Paul

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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