linux-kernel - Re: [PATCH v2 2/2] regulator: add QCOM RPMh regulator driver

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Message-ID: <20180425103136.GB24769@sirena.org.uk>
Date:   Wed, 25 Apr 2018 11:31:36 +0100
From:   Mark Brown <broonie@...nel.org>
To:     David Collins <collinsd@...eaurora.org>
Cc:     Doug Anderson <dianders@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v2 2/2] regulator: add QCOM RPMh regulator driver

On Tue, Apr 24, 2018 at 02:09:47PM -0700, David Collins wrote:
> On 04/24/2018 10:45 AM, Mark Brown wrote:

> > I think that's probably only OK if we have a specific error code for the
> > regulator being limited in this way otherwise our error handling for I/O
> > problems involves us trying to reconfigure supplies which seems like it
> > would be risky.  

> Would you be ok with -EAGAIN being used for this purpose?

Using -EAGAIN for "I can't ever read the configuration from this
regulator" doesn't seem right - it's not like any number of retries
will ever manage to read the value back.

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