linux-kernel - Re: [PATCH] i2c: Add generic support passing secondary devices addresses

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Date:	Sat, 20 Sep 2014 21:50:51 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Wolfram Sang <wsa@...-dreams.de>,
	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
CC:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	mark.rutland@....com
Subject: Re: [PATCH] i2c: Add generic support passing secondary devices addresses

On 09/20/2014 06:49 PM, Wolfram Sang wrote:
> On Fri, Sep 05, 2014 at 04:02:19PM +0200, Jean-Michel Hautbois wrote:
>> Some I2C devices have multiple addresses assigned, for example each address
>> corresponding to a different internal register map page of the device.
>> So far drivers which need support for this have handled this with a driver
>> specific and non-generic implementation, e.g. passing the additional address
>> via platform data.
>
> This raises the first question for me: Are the additional addresses
> configurable? Sadly, I can't find good documentation for the adv7604.
> Otherwise, if I know I have a adv7604 and know its addresses, this
> information should go into the driver and not the DT.
>

They are. The current driver hard codes the other addresses, but that's not 
working when you have multiple adv7604s on the same I2C bus.

- Lars
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