linux-kernel - Re: [PATCH] regulator: Allow for asymmetric settling times

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Message-ID: <20170430123001.iwauodtjkbnmjmsl@sirena.org.uk>
Date:   Sun, 30 Apr 2017 21:30:01 +0900
From:   Mark Brown <broonie@...nel.org>
To:     Laxman Dewangan <ldewangan@...dia.com>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Brian Norris <briannorris@...omium.org>
Subject: Re: [PATCH] regulator: Allow for asymmetric settling times

On Sat, Apr 29, 2017 at 01:32:09PM +0530, Laxman Dewangan wrote:
> On Saturday 29 April 2017 05:36 AM, Matthias Kaehlcke wrote:

> > -- regulator-settling-time-us: Settling time, in microseconds, for voltage
> > -  change if regulator have the constant time for any level voltage change.
> > -  This is useful when regulator have exponential voltage change.
> > +- regulator-settling-time-up-us: Settling time, in microseconds, for voltage
> > +  increase if the regulator needs a constant time to settle after voltage
> > +  increases of any level. This is useful for regulators with exponential
> > +  voltage changes.
> > +- regulator-settling-time-down-us: Settling time, in microseconds, for voltage
> > +  decrease if the regulator needs a constant time to settle after voltage
> > +  decreases of any level. This is useful for regulators with exponential
> > +  voltage changes.

> Can we have regulator-settling-time-us also so if it is there then up/down
> same.
> If up/down different then separate properties can be used.

Removing the existing binding would also break existing DTs using it
which we obviously don't want.  I don't see any reason to even deprecate
it, like Laxman says it's nice and convenient for people with symmetric
performance.

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