Re: Nokia N900 - audio TPA6130A2 problems

Ivaylo Dimitrov
2016-03-17T13:50:45Z

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