linux-kernel - Re: twl4030_charger: need changes to get probed?

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Date:	Fri, 6 Mar 2015 23:56:06 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Grazvydas Ignotas <notasas@...il.com>, ivo.g.dimitrov.75@...il.com,
	Samuel Ortiz <sameo@...ux.intel.com>, khilman@...nel.org,
	NeilBrown <neilb@...e.de>, sre@...ian.org,
	linux-pm@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>,
	"Dmitry Eremin-Solenikov" <dbaryshkov@...il.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Sebastian Reichel <sre@...nel.org>,
	GTA04 owners <gta04-owner@...delico.com>, sre@...g0.de,
	Tony Lindgren <tony@...mide.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>, patrikbachan@...il.com,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: twl4030_charger: need changes to get probed?

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@...il.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@...il.com

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