linux-kernel - Re: [PATCH v4 3/5] regulator: dt-bindings: Allow system-critical marking for fixed-regulator

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Message-ID: <ZTwsXCQ2bz7KlgFl@finisterre.sirena.org.uk>
Date:   Fri, 27 Oct 2023 22:32:12 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/5] regulator: dt-bindings: Allow system-critical
 marking for fixed-regulator

On Fri, Oct 27, 2023 at 04:24:40PM -0500, Rob Herring wrote:
> On Thu, Oct 26, 2023 at 04:48:22PM +0200, Oleksij Rempel wrote:

> > In certain projects, the main system regulator, composed of simple
> > components including an under-voltage detector and capacitors, can be
> > aptly described as a fixed regulator in the device tree. To cater to
> > such use cases, this patch extends the fixed regulator binding to
> > support the 'system-critical-regulator' property. This property
> > signifies that the fixed-regulator is vital for system stability.

> There is no programming interface for fixed-regulators, so how do you 
> know an under/over voltage condition?

There's support for interrupts now - it's a just a simple signal so if
the interrupt is asserted you know there's an error but that's all you
know.

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