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

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Date:   Mon, 9 Sep 2019 08:22:32 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Vladimir Zapolskiy <vz@...ia.com>
Cc:     jacopo mondi <jacopo@...ndi.org>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Peter Rosin <peda@...ntia.se>, 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 Vladimir,

> I won't attend the LPC, however I would appreciate if you book some

A pity. I would have liked to have you in the room. Let's see if we can
get enough input from you via mail here.

> time to review my original / alternative implementation of the TI
> DS90Ux9xx I2C bridge device driver.

We have only 45 minutes, this will not allow to review specific
implementations. I want to give an overview of existing implementations
with pros/cons...

> 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.

... and I'd appreciate support here from you, like your summary of the
back then discussion (from where I can dive deeper if needed).

Also, with Luca's new series we discussed some scenarios which can
happen WRT to I2C address conflicts. Maybe you could comment on them,
too? As I read the old thread, you have a hardcoded aliases using
"ti,i2c-bridge-maps". This means you can't have own DTSI files for e.g.
add-on modules, do I get this correctly?

Regards,

   Wolfram

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