linux-kernel - Re: [RFC,v2 2/6] i2c: add I2C Address Translator (ATR) support

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Date:   Mon, 9 Sep 2019 07:56:22 +0300
From:   Vladimir Zapolskiy <vz@...ia.com>
To:     jacopo mondi <jacopo@...ndi.org>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Wolfram Sang <wsa@...-dreams.de>, Peter Rosin <peda@...ntia.se>
Cc:     linux-media@...r.kernel.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>
Subject: Re: [RFC,v2 2/6] i2c: add I2C Address Translator (ATR) support

Hi Luca, Jacopo, Wolfram, Peter,

On 09/08/2019 11:45 PM, Vladimir Zapolskiy wrote:
> Hi Luca, Jacopo, Wolfram, Peter,
> 
> On 09/01/2019 05:31 PM, jacopo mondi wrote:
>> Hi Luca,
>>    thanks for keep pushing this series! I hope we can use part of this
>> for the (long time) on-going GMSL work...
>>
>> I hope you will be patient enough to provide (another :) overview
>> of this work during the BoF Wolfram has organized at LPC for the next
>> week.
>>
>> In the meantime I would have some comments after having a read at the
>> series and trying to apply its concept to GMSL
>>
> 
> I won't attend the LPC, however I would appreciate if you book some
> time to review my original / alternative implementation of the TI
> DS90Ux9xx I2C bridge device driver.
> 
> For your convenience the links to the driver are given below:
> * dt bindings: https://lore.kernel.org/lkml/20181012060314.GU4939@dell/T/#mead5ea226550b
> * driver code: https://lore.kernel.org/lkml/20181012060314.GU4939@dell/T/#m2fe3664c5f884
> * usage example: https://lore.kernel.org/lkml/20181012060314.GU4939@dell/T/#m56c146f5decdc
> 
> The reasons why my driver is better/more flexible/more functional are
> discussed earlier, please let me know, if you expect anything else
> from me to add, also I would be happy to get a summary of your offline
> discussion.

I forgot to repeat my main objection against Luca's approach, the TI
DS90Ux9xx I2C bridge driver does not require to call i2c_add_adapter()
or register a new mux/bus and then do run select/deselect in runtime to
overcome the created handicap.

> The undeniable fact is that the device tree bindings in my I2C bridge
> implementation can be improved further, thanks to Luca for the comments.
> 
>> On Tue, Jul 23, 2019 at 10:37:19PM +0200, Luca Ceresoli wrote:
>>> 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.
>>>
>>> Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
>>>
> 

--
Best wishes,
Vladimir