linux-kernel - Re: [PATCH 1/3] power: supply: bq27xxx: fix sign of current

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Message-ID: <20210223145335.2vsfclgeqpsmacfp@pali>
Date:   Tue, 23 Feb 2021 15:53:35 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        Dan Murphy <dmurphy@...com>,
        Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, maemo-leste@...ts.dyne.org
Subject: Re: [PATCH 1/3] power: supply: bq27xxx: fix sign of current_now for
 newer ICs

On Tuesday 23 February 2021 15:49:46 Andreas Kemnade wrote:
> On Tue, 23 Feb 2021 15:11:20 +0100
> Matthias Schiffer <matthias.schiffer@...tq-group.com> wrote:
> 
> > Commit cd060b4d0868 ("power: supply: bq27xxx: fix polarity of current_now")
> > changed the sign of current_now for all bq27xxx variants, but on BQ28Z610
> > I'm now seeing negated values *with* that patch.
> > 
> > The GTA04/Openmoko device that was used for testing uses a BQ27000 or
> > BQ27010 IC, so I assume only the BQ27XXX_O_ZERO code path was incorrect.
> > Revert the behaviour for newer ICs.
> > 
> > Fixes: cd060b4d0868 "power: supply: bq27xxx: fix polarity of current_now"
> > Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> > ---
> > 
> > @Andreas Kemnade: It would be great to get a confirmation that the
> > Openmoko battery indeed uses BQ27000/BQ27010 - I was having some trouble
> > finding that information.
> > 
> I can confirm that.
> here is the corresponding schematic:
> 
> http://people.openmoko.org/tony_tu/GTA02/hardware/GTA02/CT-GTA02.pdf
> 
> Regards,
> Andreas

Nokia N900 has BQ27200 connected via i2c. CCing Maemo mailing list maemo-leste@...ts.dyne.org