linux-kernel - Re: [PATCH] media: dt-bindings: media: renesas,csi2: Update data-lanes property

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Message-ID: <CA+V-a8sNoX6=MUj6VVR7ewR2O8gbQb9z41MAYzehd0P05VYL2w@mail.gmail.com>
Date:   Tue, 18 Jan 2022 10:55:02 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Biju Das <biju.das.jz@...renesas.com>,
        linux-media <linux-media@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: dt-bindings: media: renesas,csi2: Update
 data-lanes property

On Tue, Jan 18, 2022 at 9:11 AM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
>
> Hi Jacopo,
>
> Thank you for the review.
>
> On Mon, Jan 17, 2022 at 8:11 AM Jacopo Mondi <jacopo@...ndi.org> wrote:
> >
> > Hello Prabhakar,
> >
> > On Thu, Jan 13, 2022 at 10:32:14AM +0000, Lad Prabhakar wrote:
> > > CSI-2 (CSI4LNK0) on R-Car and RZ/G2 supports 4-lane mode which is already
> > > handled by rcar-csi2.c driver. This patch updates the data-lanes property
> > > to describe the same.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > ---
> > >  .../devicetree/bindings/media/renesas,csi2.yaml          | 9 ++++++++-
> > >  1 file changed, 8 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/media/renesas,csi2.yaml b/Documentation/devicetree/bindings/media/renesas,csi2.yaml
> > > index e6a036721082..064a0a4c5737 100644
> > > --- a/Documentation/devicetree/bindings/media/renesas,csi2.yaml
> > > +++ b/Documentation/devicetree/bindings/media/renesas,csi2.yaml
> > > @@ -67,7 +67,14 @@ properties:
> > >                  maxItems: 1
> > >
> > >                data-lanes:
> > > -                maxItems: 1
> > > +                items:
> > > +                  minItems: 1
> > > +                  maxItems: 4
> > > +                  items:
> > > +                    - const: 1
> > > +                    - const: 2
> > > +                    - const: 3
> > > +                    - const: 4
> >
> > Seeing "maxItems: 1" there confuses me too, as the property is an
> > array of data-lanes, but I'm afraid your change does not what you
> > intend as it would allow you to specify the number of data lanes as an
> > integer rather than as an array.
> >
> Agreed, what do you think of the below instead?
>
>             properties:
>               data-lanes:
>                 minItems: 1
>                 maxItems: 4
uniqueItems: true

can go in as well, to avoid duplicate lane numbers.

>                 items:
>                   maximum: 4
>
Cheers,
Prabhakar