linux-kernel - Re: [PATCH] media: dt-bindings: Merge OV5695 into OV5693 binding

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Date:   Tue, 1 Aug 2023 07:45:08 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Daniel Scally <djrscally@...il.com>,
        Dafna Hirschfeld <dafna@...tmail.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Tommaso Merciai <tommaso.merciai@...rulasolutions.com>,
        Helen Koike <helen.koike@...labora.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] media: dt-bindings: Merge OV5695 into OV5693 binding

On Mon, Jul 31, 2023 at 5:21 AM Sakari Ailus <sakari.ailus@....fi> wrote:
>
> Hi Rob,
>
> On Fri, Jul 07, 2023 at 03:06:04PM -0600, Rob Herring wrote:
> > The OV5695 binding is almost the same as the OV5693 binding. The only
> > difference is 'clock-names' is defined for OV5695. However, the lack of
> > clock-names is an omission as the Linux OV5693 driver expects the same
> > 'xvclk' clock name.
> >
> > 'link-frequencies' is required by OV5693, but not OV5695. Just drop it
> > from being required. Expressing it conditionally would be ugly. It
> > shouldn't really be required either as the driver only supports 1
> > frequency anyways.
>
> The correct way to address this would appear to be to add link-frequencies
> for both of these devices. I think I've seen one or two sensors of this
> class (raw, CSI-2/parallel, external clock etc.) with link frequencies
> documented as "fixed" --- which is probably a documentation issue more than
> anything else.

link-frequencies is already supported. It's just a question of being
required or not. Adding a property as required is an ABI break (if the
OS starts requiring the property).

Rob