linux-kernel - Re: [PATCH v5 4/8] dt-bindings: media: add bindings for TI DS90UB953

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Date:   Wed, 4 Jan 2023 10:26:16 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Wolfram Sang <wsa@...nel.org>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Peter Rosin <peda@...ntia.se>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Shawn Tu <shawnx.tu@...el.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mike Pagano <mpagano@...too.org>,
        Krzysztof Hałasa <khalasa@...p.pl>,
        Marek Vasut <marex@...x.de>
Subject: Re: [PATCH v5 4/8] dt-bindings: media: add bindings for TI DS90UB953

Hi Rob,

On 09/12/2022 23:27, Rob Herring wrote:
> On Thu, Dec 08, 2022 at 12:40:02PM +0200, Tomi Valkeinen wrote:
>> Add DT bindings for TI DS90UB953 FPDLink-3 Serializer.
> 
> Seems like this and DS90UB913 binding could be combined. I couldn't spot
> a difference.

They are indeed quite similar, but there are a few diffs, especially 
after fixing Laurent's review comments.

E.g, as the UB913 is a parallel video serializer and the UB953 is a 
CSI-2 serializer, the input port on UB913 has 'pclk-sample' property but 
UB953 has 'data-lanes' property. The descriptions differ also a bit for 
the above mentioned difference.

The above points would still allow combining the bindings, though. But I 
feel the UB913 is somewhat a different class of serializer device 
compared to UB953 (and UB971 which the UB953's binding also supports), 
so my gut feeling says it's better to keep them separate. But I don't 
have much experience on maintaining such bindings, and, afaik, we could 
always split the bindings later if needed.

So... Do you have a preference on either way? Or maybe we can come back 
to this after I send the next version with the updates.

> In the subjects, drop 'binding for'. The prefix says this is a binding.
> Maybe add 'Serializer'.

Ok.

  Tomi