Re: twl4030_charger: need changes to get probed?

Pali Rohár
2015-03-06T22:56:11Z

[-- Attachment #1: Type: Text/Plain, Size: 1357 bytes --]

On Friday 06 March 2015 23:40:34 Pavel Machek wrote:
> On Sat 2015-03-07 00:12:07, Grazvydas Ignotas wrote:
> > On Fri, Mar 6, 2015 at 11:57 PM, Pali Rohár
> > <pali.rohar@gmail.com> wrote:
> > > On Friday 06 March 2015 22:24:17 Pavel Machek wrote:
> > >> Hi!
> > >>
> > >> According to n900 dts, twl4030-bci (aka charger) should
> > >> be included.
> > >
> > > AFAIK it is not present on n900...
> >
> > Right, it uses twl5030 variant without the charger, charging
> > on n900 is provided by separate chip and for a good reason
> > as twl's charger is not that good. Forcing the driver to
> > load just ends up with it accessing non-existent registers
> > over i2c.
>
> Ok, but:
>
> 1) Why is the twl4030-bci enabled in n900's dts, then
>

maybe it is bug in n900 dts...

Grazvydas, is there some runtime check if twl4030/twl5030 chip
has charger or not? or do we need to explicitly disable device
twl4030-bci in DT?

> and
>
> 2) When it is enabled, why it does not load?
>
> (I guess there's no way to get to input voltage on n900...?)
>
> Pavel

you can read voltage only from rx51_battery.ko (TWL ADC) or
bq27x00_battery.ko

look for Nokia_N900_RX-51_Schematics.pdf file where you can find
information what is connected to ADC and bq27200 chip.

--
Pali Rohár
pali.rohar@gmail.com

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 198 bytes --]