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

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Date:   Tue, 8 Dec 2020 13:54:32 -0600
From:   Rob Herring <robh@...nel.org>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Maxime Ripard <maxime@...no.tech>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-sunxi@...glegroups.com,
        Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonathan Corbet <corbet@....net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kevin.lhopital@...mail.com
Subject: Re: [PATCH v2 06/19] dt-bindings: media: sun6i-a31-csi: Add MIPI
 CSI-2 input port

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@...tlin.com>
> > > ---
> > >  .../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