linux-kernel - Re: [PATCH v1 0/2] regulator: forward undervoltage events downstream

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Message-ID: <aNvvwcXW_zNdAVp5@finisterre.sirena.org.uk>
Date: Tue, 30 Sep 2025 15:57:05 +0100
From: Mark Brown <broonie@...nel.org>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Liam Girdwood <lgirdwood@...il.com>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/2] regulator: forward undervoltage events downstream

On Tue, Sep 30, 2025 at 02:08:55PM +0200, Oleksij Rempel wrote:
> This short series lets critical supply events propagate to consumers.
> It introduces an opt-in helper in the core to forward
> REGULATOR_EVENT_UNDER_VOLTAGE from a regulator's supply to the
> consumer's notifier chain, and opts the fixed regulator in at probe.
> 
> Only under-voltage is forwarded to avoid surprises. Behavior is
> unchanged unless a driver calls the helper. No DT/UAPI/ABI changes.

On the one hand I appreciate the caution.  On the other hand I'm
struggling to articulate the circumstances in which one would not wish
to forward events to downstream regulators.  Perhaps the option should
be opt out instead?

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