linux-kernel - Re: [PATCH v11 1/7] i2c: add I2C Address Translator (ATR) support

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Message-ID: <ZEZafj6j+EurGWJ7@sai>
Date:   Mon, 24 Apr 2023 12:31:26 +0200
From:   Wolfram Sang <wsa@...nel.org>
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>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        Andy Shevchenko <andriy.shevchenko@...el.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>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mike Pagano <mpagano@...too.org>,
        Krzysztof Hałasa <khalasa@...p.pl>,
        Marek Vasut <marex@...x.de>,
        Satish Nagireddy <satish.nagireddy@...cruise.com>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v11 1/7] i2c: add I2C Address Translator (ATR) support

On Fri, Apr 21, 2023 at 01:18:27PM +0300, Tomi Valkeinen wrote:
> From: Luca Ceresoli <luca@...aceresoli.net>
> 
> An ATR is a device that looks similar to an i2c-mux: it has an I2C
> slave "upstream" port and N master "downstream" ports, and forwards
> transactions from upstream to the appropriate downstream port. But it
> is different in that the forwarded transaction has a different slave
> address. The address used on the upstream bus is called the "alias"
> and is (potentially) different from the physical slave address of the
> downstream chip.
> 
> Add a helper file (just like i2c-mux.c for a mux or switch) to allow
> implementing ATR features in a device driver. The helper takes care or
> adapter creation/destruction and translates addresses at each transaction.
> 
> Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

This looks good to me. Dunno if the DT folks want the binding as a
seperate patch, but this is good to go as far as I am concerned.
Everything else can be fixed incrementally, I think. Also, this can go
in via the media-tree, there shouldn't be any conflicts.

Acked-by: Wolfram Sang <wsa@...nel.org>

Thanks for keeping at it!


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