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Message-ID: <11b87742-bb92-7f8f-8939-2e403d2652e5@ideasonboard.com>
Date:   Thu, 8 Dec 2022 09:56:21 +0200
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Subject: Re: [PATCH v4 2/8] i2c: add I2C Address Translator (ATR) support
To:     Luca Ceresoli <luca.ceresoli@bootlin.com>
Cc:     Andy Shevchenko <andriy.shevchenko@intel.com>,
        devicetree@vger.kernel.org, linux-i2c@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Jacopo Mondi <jacopo@jmondi.org>,
        Kieran Bingham <kieran.bingham@ideasonboard.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Luca Ceresoli <luca@lucaceresoli.net>,
        Mark Rutland <mark.rutland@arm.com>,
        Matti Vaittinen <Matti.Vaittinen@fi.rohmeurope.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Peter Rosin <peda@axentia.se>,
        Rob Herring <robh+dt@kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Vladimir Zapolskiy <vz@mleia.com>,
        Wolfram Sang <wsa@the-dreams.de>,
        satish.nagireddy@getcruise.com
References: <20221101132032.1542416-1-tomi.valkeinen@ideasonboard.com>
 <20221101132032.1542416-3-tomi.valkeinen@ideasonboard.com>
 <Y2EtnSNqBOfGRDMO@smile.fi.intel.com>
 <cc510516-c961-9efb-bcdf-2abea795433a@ideasonboard.com>
 <20221107124055.0495031f@booty>
Content-Language: en-US
From:   Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
In-Reply-To: <20221107124055.0495031f@booty>
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On 07/11/2022 13:40, Luca Ceresoli wrote:
> On Fri, 4 Nov 2022 13:59:06 +0200
> Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> wrote:
> 
>> Hi Andy,
>>
>> On 01/11/2022 16:30, Andy Shevchenko wrote:
>>> On Tue, Nov 01, 2022 at 03:20:26PM +0200, 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 is
>>>> 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.
> 
> First of all, thank you for bringing this work on!
> 
>>> ...
>>>    
>>>> +I2C ADDRESS TRANSLATOR (ATR)
>>>> +M:	Luca Ceresoli <luca@lucaceresoli.net>
>>>
>>> Hmm... Are you going to maintain this? Or Review? Why not?
>>
>> We haven't discussed with Luca if he wants to maintain this (this is
>> mostly his code). But, indeed, I should add my name there.
> 
> I think at this point you are probably in a better position to be the
> maintainer, but I'm OK with being listed here as reviewer (R:).
> 
> Ah, would you please use my bootlin dot com address here?

Ok, I've added your bootlin address as R:

  Tomi