linux-kernel - Re: [PATCH RFC 1/2] regmap: add option to disable debugfs

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Message-ID: <YrCXILblKsp6DuN3@sirena.org.uk>
Date:   Mon, 20 Jun 2022 16:49:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Aisheng Dong <aisheng.dong@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dongas86@...il.com" <dongas86@...il.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        Peng Fan <peng.fan@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
Subject: Re: [PATCH RFC 1/2] regmap: add option to disable debugfs

On Mon, Jun 20, 2022 at 03:47:05PM +0000, Aisheng Dong wrote:

> > As indicated in the message you're linking to here if the device can't be
> > accessed it should be being put in cache only mode which will ensure that
> > nothing can do any physical accesses.

> I wonder that's not a stable solution assuming there're possible volatile registers.
> Isn't that?

The driver is going to need to power the device back up to access the
volatile registers so it can take the device out of cache only mode when
it's doing that can't it?

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