linux-kernel - Re: regulator: BD71837 PMIC resume during noirq phase?

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Message-ID: <Yqhf7/3B0l9+3dQH@sirena.org.uk>
Date:   Tue, 14 Jun 2022 11:16:15 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     matti.vaittinen@...rohmeurope.com, lgirdwood@...il.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: regulator: BD71837 PMIC resume during noirq phase?

On Tue, Jun 14, 2022 at 11:57:18AM +0200, Martin Kepplinger wrote:
> Am Dienstag, dem 14.06.2022 um 10:18 +0100 schrieb Mark Brown:

> > Indeed - if a power domain is controlling regulators then I'd not
> > expect
> > things to go well if it tries to resume without interrupts, there
> > will
> > be some things that can be done purely with GPIOs but that's
> > depending
> > on the hardware having wired things up that way and the operations
> > needed by the power domain mapping well onto what can be done with
> > GPIOs.
> 
> and what's the danger when resuming power domains later?:

If there's a device that needs to early resume in a power domain that
needs to do something on resume then presumably this will mess up the
ordering.  You probably need a separate power domain type, or both
operations.

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