On Friday 06 March 2015 23:40:34 Pavel Machek wrote:

On Sat 2015-03-07 00:12:07, Grazvydas Ignotas wrote:

quoted

On Fri, Mar 6, 2015 at 11:57 PM, Pali Rohár
[off-list ref] wrote:

quoted

On Friday 06 March 2015 22:24:17 Pavel Machek wrote:

quoted

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