linux-kernel - Re: [PATCH v7 0/7] i2c-atr and FPDLink

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Message-ID: <Y8gX0krXayfOa4Hi@smile.fi.intel.com>
Date:   Wed, 18 Jan 2023 18:01:22 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Wolfram Sang <wsa@...nel.org>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.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>,
        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 v7 0/7] i2c-atr and FPDLink

On Wed, Jan 18, 2023 at 02:40:24PM +0200, Tomi Valkeinen wrote:
> Hi,
> 
> You can find the v6 from:
> 
> https://lore.kernel.org/all/20230105140307.272052-1-tomi.valkeinen@ideasonboard.com/
> 
> Main changes:
> 
> * i2c-atr: Use bus notifier. This allows us to drop the patch that adds
>   the attach_client/detach_client callbacks. On the downside, it removes
>   the option for error handling if the translation setup fails, and also
>   doesn't provide us the pointer to the i2c_board_info. I belive both
>   are acceptable downsides.
> 
> * Use fwnode in the fpdlink drivers instead of OF
> 
> * Addressed all the review comments (I hope)
> 
> * Lots of cosmetic or minor fixes which I came up while doing the fwnode
>   change

I believe my comments to the first driver applies to the next two, so please
address them whenever you are agree / it's possible / it makes sense.

About ATR implementation. We have the i2c bus (Linux representation of
the driver model) and i2c_adapter and i2c_client objects there. Can't we
have an i2c_client_aliased in similar way and be transparent with users?

It's just a thought which may be well far from the possibility
to be implemented if even possible...

-- 
With Best Regards,
Andy Shevchenko