linux-kernel - Re: [PATCH v4 3/4] regulator: Add support for a fixed delay after voltage increases

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Message-ID: <20160912183624.GG27946@sirena.org.uk>
Date:   Mon, 12 Sep 2016 19:36:24 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     lgirdwood@...il.com, Douglas Anderson <dianders@...omium.org>,
        briannorris@...omium.org, javier@...hile0.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/4] regulator: Add support for a fixed delay after
 voltage increases

On Tue, Sep 06, 2016 at 12:05:04PM -0700, Matthias Kaehlcke wrote:

> the stabilisation time. This change introduces the device tree property
> "regulator-settle-time-up-us" which allows to specify a fixed delay

> We don't add an option of a fixed delay on the way down for now because
> the way down is probably modelled best with a ramp rate, not a fixed
> delay.

Are you sure?  It seems more likely to be highly load dependent if
there's an appreciable variation.  That could be a ramp rate if you've
got a very predictable load and a simple regulator but it seems like
the system is less likely to care if we collapsed down in that case.

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