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

Wolfram Sang
2023-04-24T10:32:27Z

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On Fri, Apr 21, 2023 at 01:18:27PM +0300, Tomi Valkeinen wrote:
> From: Luca Ceresoli <luca@lucaceresoli.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@lucaceresoli.net>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.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@kernel.org>

Thanks for keeping at it!

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