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

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Message-ID: <bd6d6cc0-4e70-fa31-4b5e-e6bcddf62d36@ideasonboard.com>
Date:   Wed, 18 Jan 2023 19:28:20 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.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 18/01/2023 18:01, Andy Shevchenko wrote:
> 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?

Can you clarify what you mean here?

The i2c_clients are not aware of the i2c-atr. They are normal i2c 
clients. The FPD-Link drivers are aware of the ATR, as the FPD-Link 
hardware contains the ATR support.

  Tomi