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Message-ID: <11b87742-bb92-7f8f-8939-2e403d2652e5@ideasonboard.com>
Date: Thu, 8 Dec 2022 09:56:21 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: Andy Shevchenko <andriy.shevchenko@...el.com>,
devicetree@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Jacopo Mondi <jacopo@...ndi.org>,
Kieran Bingham <kieran.bingham@...asonboard.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Luca Ceresoli <luca@...aceresoli.net>,
Mark Rutland <mark.rutland@....com>,
Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Peter Rosin <peda@...ntia.se>,
Rob Herring <robh+dt@...nel.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Vladimir Zapolskiy <vz@...ia.com>,
Wolfram Sang <wsa@...-dreams.de>,
satish.nagireddy@...cruise.com
Subject: Re: [PATCH v4 2/8] i2c: add I2C Address Translator (ATR) support
On 07/11/2022 13:40, Luca Ceresoli wrote:
> On Fri, 4 Nov 2022 13:59:06 +0200
> Tomi Valkeinen <tomi.valkeinen@...asonboard.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@...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 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@...aceresoli.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
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