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From: Vladimir Zapolskiy <vz@mleia.com>
To: jacopo mondi <jacopo@jmondi.org>,
	Luca Ceresoli <luca@lucaceresoli.net>,
	Wolfram Sang <wsa@the-dreams.de>, Peter Rosin <peda@axentia.se>
Cc: linux-media@vger.kernel.org, linux-i2c@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Kieran Bingham <kieran.bingham@ideasonboard.com>
Subject: Re: [RFC,v2 2/6] i2c: add I2C Address Translator (ATR) support
Date: Mon, 9 Sep 2019 07:56:22 +0300
Message-ID: <1fb71437-eaa2-99a7-885f-63ee769969aa@mleia.com> (raw)
In-Reply-To: <aedad45b-16d6-d189-b045-329727440ca5@mleia.com>

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@lucaceresoli.net>
>>>
> 

--
Best wishes,
Vladimir


  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-23 20:37 [RFC,v2 0/6] TI camera serdes and I2C address translation Luca Ceresoli
2019-07-23 20:37 ` [RFC,v2 1/6] i2c: core: let adapters be notified of client attach/detach Luca Ceresoli
2019-07-23 20:37 ` [RFC,v2 2/6] i2c: add I2C Address Translator (ATR) support Luca Ceresoli
2019-09-01 14:31   ` jacopo mondi
2019-09-03  7:31     ` Luca Ceresoli
2019-09-03  7:37       ` Wolfram Sang
2019-09-04  8:09       ` Peter Rosin
2019-09-08 19:40         ` Luca Ceresoli
2019-09-10 18:46           ` Wolfram Sang
2019-09-08 20:45     ` Vladimir Zapolskiy
2019-09-09  4:56       ` Vladimir Zapolskiy [this message]
2019-09-10 17:40         ` Luca Ceresoli
2019-09-09  7:22       ` Wolfram Sang
2019-09-09 15:10         ` Vladimir Zapolskiy
2019-09-09 17:48           ` Luca Ceresoli
2019-09-10 17:16             ` Wolfram Sang
2019-09-02 20:42   ` Wolfram Sang
2019-09-03  8:48     ` Luca Ceresoli
2019-09-03  9:06       ` Wolfram Sang
2019-07-23 20:37 ` [RFC,v2 3/6] media: dt-bindings: add DS90UB954-Q1 video deserializer Luca Ceresoli
2019-08-13 15:44   ` Rob Herring
2019-08-19 22:41     ` Luca Ceresoli
2019-08-20 15:44       ` Rob Herring
2019-08-21 21:50         ` Luca Ceresoli
2019-09-02 20:48   ` Wolfram Sang
2019-09-03  9:09     ` Luca Ceresoli
2019-09-03  9:34       ` Wolfram Sang
2019-09-03 11:03         ` Luca Ceresoli
2019-09-03 14:16           ` Wolfram Sang
2019-09-10  9:43   ` Sakari Ailus
2019-09-10 15:02     ` Luca Ceresoli
2019-07-23 20:37 ` [RFC,v2 4/6] media: dt-bindings: add DS90UB953-Q1 video serializer Luca Ceresoli
2019-07-23 20:37 ` [RFC,v2 5/6] media: ds90ub954: new driver for TI DS90UB954-Q1 video deserializer Luca Ceresoli
2019-07-23 20:37 ` [RFC,v2 6/6] media: ds90ub953: new driver for TI DS90UB953-Q1 video serializer Luca Ceresoli

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