Re: [PATCH v2 06/19] dt-bindings: media: sun6i-a31-csi: Add MIPI CSI-2 input port
From: Rob Herring
Date: Tue Dec 08 2020 - 15:26:48 EST
On Wed, Dec 02, 2020 at 03:16:44PM +0100, Paul Kocialkowski wrote:
> 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.
There's about to be. Don't use what's in graph.yaml (in dt-schema) yet.
Rob