linux-kernel - Re: [PATCH RFC] regulator: core: fix handling negative voltages e.g. in EPD PMICs

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Date:   Mon, 24 Feb 2020 12:05:12 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     hns@...delico.com, j.neuschaefer@....net, contact@...lk.fr,
        GNUtoo@...erdimension.org, josua.mayer@....eu, lgirdwood@...il.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] regulator: core: fix handling negative voltages e.g.
 in EPD PMICs

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.

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