linux-kernel - Re: [PATCH v5 1/6] dt-bindings: media: platform: visconti: Add Toshiba Visconti Video Input Interface bindings

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Message-ID: <Y8bFjhHkbNAKQK3t@pendragon.ideasonboard.com>
Date:   Tue, 17 Jan 2023 17:58:06 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Mark Brown <broonie@...nel.org>, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v5 1/6] dt-bindings: media: platform: visconti: Add
 Toshiba Visconti Video Input Interface bindings

Hi Krzysztof,

On Tue, Jan 17, 2023 at 04:42:51PM +0100, Krzysztof Kozlowski wrote:
> On 17/01/2023 16:26, Laurent Pinchart wrote:
> >
> >> +
> >> +          clock-lanes:
> >> +            description: VIIF supports 1 clock line
> > 
> > s/line/lane/
> > 
> >> +            const: 0
> > 
> > I would also add
> > 
> >           clock-noncontinuous: true
> >           link-frequencies: true
> > 
> > to indicate that the above two properties are used by this device.
> 
> No, these are coming from other schema and there is never need to
> mention some property to indicate it is more used than other case. None
> of the bindings are created such way, so this should not be exception.

There are some bindings that do so, but that may not be a good enough
reason, as there's a chance I wrote those myself :-)

I would have sworn that at some point in the past the schema wouldn't
have validated the example with this omitted. I'm not sure if something
changed or if I got this wrong.

video-interfaces.yaml defines lots of properties applicable to
endpoints. For a given device, those properties should be required
(easy, that's defined in the bindings), optional, or forbidden. How do
we differentiate between the latter two cases ?

-- 
Regards,

Laurent Pinchart