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

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Message-ID: <541F25AD.7030204@metafoo.de>
Date:	Sun, 21 Sep 2014 21:23:25 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>,
	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 09/21/2014 07:49 PM, Wolfram Sang wrote:
>
>>> 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.
>
> How is this configured? I can't imagine every address has its own
> setting, but rather some 1-3 pins which select a certain block of
> addresses?
>

Every secondary address has its own register and can be set to any valid I2C 
address.

- Lars
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