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

Tomi Valkeinen
2023-04-24T10:52:12Z

On 24/04/2023 13:31, Wolfram Sang wrote:
> 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.

Ah, right. I'll resend with the DT bindings separate.

Tomi