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From: Andreas Kemnade <andreas@kemnade.info>
To: Mark Brown <broonie@kernel.org>
Cc: hns@goldelico.com, j.neuschaefer@gmx.net, contact@paulk.fr,
	GNUtoo@cyberdimension.org, josua.mayer@jm0.eu,
	lgirdwood@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC] regulator: core: fix handling negative voltages e.g. in EPD PMICs
Date: Mon, 24 Feb 2020 19:46:25 +0100	[thread overview]
Message-ID: <20200224194625.20078cf2@kemnade.info> (raw)
In-Reply-To: <20200224120512.GG6215@sirena.org.uk>

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Hi,

On Mon, 24 Feb 2020 12:05:12 +0000
Mark Brown <broonie@kernel.org> wrote:

> On Sun, Feb 23, 2020 at 04:35:01PM +0100, Andreas Kemnade wrote:
> 
> > An alternative would be to handle voltages as absolute values.
> > There are probably no regulators with support both negative
> > and positive output.  
> 
> This is what'd be needed, your approach here is a bit of a hack and
> leaves some values unrepresentable if they overlap with errnos which
> obviously has issues if someone has a need for those values.  Ground is
> to a large extent somewhat arbatrary anyway and some systems do just
> redefine it as part of their normal operation (eg, VMID based audio
> systems) so this wouldn't be a huge departure.

Thanks for clarification, outputs from 0mV to -4mV would not be be
representable. I am now converting stuff to think positive ;-) That
is good to decide early before pushing my huge pile of things needed
for EPD support on top of mainline somewhere.
Parallel I am evaluating upstreaming of the tps65181 driver which
probably ends up in a rewrite...

Regards,
Andreas

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  parent reply	other threads:[~2020-02-24 18:46 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-23 15:35 Andreas Kemnade
2020-02-24 12:05 ` Mark Brown
2020-02-24 12:22   ` H. Nikolaus Schaller
2020-02-24 12:31     ` Mark Brown
2020-02-24 18:46   ` Andreas Kemnade [this message]
2020-02-24 15:21 ` Denis 'GNUtoo' Carikli
2020-02-24 17:00   ` Mark Brown

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