Messages in this thread | | | Subject | Re: Nokia N900 - audio TPA6130A2 problems | From | Ivaylo Dimitrov <> | Date | Thu, 17 Mar 2016 15:50:37 +0200 |
| |
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
| |