LKML Archive on
help / color / mirror / Atom feed
From: Andreas Kemnade <>
To: Mark Brown <>
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: <> (raw)
In-Reply-To: <>

[-- Attachment #1: Type: text/plain, Size: 1111 bytes --]


On Mon, 24 Feb 2020 12:05:12 +0000
Mark Brown <> 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...


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \
    --subject='Re: [PATCH RFC] regulator: core: fix handling negative voltages e.g. in EPD PMICs' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).