linux-kernel - Re: [PATCH v2 2/5] mfd: lochnagar: Add support for the Cirrus Logic Lochnagar

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Message-ID: <20181026154952.GB27137@sirena.org.uk>
Date:   Fri, 26 Oct 2018 16:49:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Lee Jones <lee.jones@...aro.org>, mturquette@...libre.com,
        sboyd@...nel.org, linus.walleij@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, lgirdwood@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com, linux-clk@...r.kernel.org,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 2/5] mfd: lochnagar: Add support for the Cirrus Logic
 Lochnagar

On Thu, Oct 25, 2018 at 02:47:59PM +0100, Richard Fitzgerald wrote:

> access. What does regmap debugfs do if you don't have a readables
> list? Just reading a debugfs shouldn't be able to kill the hardware.
> You might need to add a precious list which is more error prone
> than listing the valid readables we are using.

It assumes everything is readable unless it's explicitly told otherwise
or the register map is overall write only (like a 7x9 one).  You could
mark the registers as precious to cause it to only do explicit I/O
operations on them but that's not what you mean and won't be as good a
guarantee that nothing can trigger a read.

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