From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Subject: Re: Nokia N900 - audio TPA6130A2 problems
Date: Thu, 17 Mar 2016 15:50:37 +0200
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To: Tony Lindgren <tony@atomide.com>
Cc: =?UTF-8?Q?Pali_Roh=c3=a1r?= <pali.rohar@gmail.com>, Sebastian Reichel <sre@kernel.org>, Grygorii Strashko <grygorii.strashko@ti.com>, Peter Ujfalusi <peter.ujfalusi@ti.com>, Jarkko Nikula <jarkko.nikula@bitmer.com>, Lars-Peter Clausen <lars@metafoo.de>, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, Pavel Machek <pavel@ucw.cz>, Aaro Koskinen <aaro.koskinen@iki.fi>, Nishanth Menon <nm@ti.com>, merlijn@wizzup.org
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Hi,

On 17.03.2016 15:33, Tony Lindgren wrote:
>
> Check the schematics. If the hardware has external pull-ups on a
> line then don't enable the internal pull-ups. Otherwise both the
> external and intenal pulls are parallel the pull value will be
> wrong. My guess is that on n900 all the i2c lines have external
> pulls.

There are, 1k connected to VIO_18, but still, stock Nokia kernel enables 
the internal pull-ups as well. I doubt Nokia devs did that by mistake. 
Could it be that VIO_18 is disabled by the time  TPA6130A2 is probed?

Also, what is the problem to have both internal and external pull-ups in 
parallel?

Regards,
Ivo