linux-kernel - Re: Issue: regmap: use debugfs even when no device

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Message-ID: <20190528132632.GJ2456@sirena.org.uk>
Date:   Tue, 28 May 2019 14:26:32 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Duan <fugang.duan@....com>
Cc:     "david@...hnology.com" <david@...hnology.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        Robby Cai <robby.cai@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Issue: regmap: use debugfs even when no device

On Tue, May 28, 2019 at 02:20:15AM +0000, Andy Duan wrote:

> So on i.MX8MM/8QM/8QXP platforms, we catch the issue that user dump regmap registers without
> power cause system hang.
> Maybe revert the patch is more reasonable ?

This is an issue with or without a device - you can have the same issue
with devices that are powered off.  Typically where power is dynamic the
driver will use a register cache so the registers are always available.

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