linux-kernel - Re: [PATCH v4 0/6] mfd/regulator/clk: bd71837: ROHM BD71837 PMIC driver

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Message-ID: <20180530154133.GP6920@sirena.org.uk>
Date:   Wed, 30 May 2018 16:41:33 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, lee.jones@...aro.org, lgirdwood@...il.com,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, mikko.mutanen@...rohmeurope.com,
        heikki.haikola@...rohmeurope.com
Subject: Re: [PATCH v4 0/6] mfd/regulator/clk: bd71837: ROHM BD71837 PMIC
 driver

On Wed, May 30, 2018 at 03:56:34PM +0300, Matti Vaittinen wrote:
> On Wed, May 30, 2018 at 12:00:00PM +0100, Mark Brown wrote:

> > The tradeoff with forced PWM mode is that the quality of regulation will
> > be a lot better, especially if the load changes suddenly (as things like
> > CPUs often do).  Most hardware that's at all current is able respond to
> > changes in load and switch modes automatically when it's appropriate,
> > except possibly in some very low power modes.

> Yes. The mode switching is automatic. But there is this control bit for
> disabling automatic mode switching and forcing the PWM. Problem with
> these 4 last bucks is just that if regulator is in PFM (and it may be
> if not forced to PWM - due to this automatic switching) then the voltage
> change is not behaving well.

That sounds like the mode switching just isn't very good and needs a bit
of help so forcing the mode is probably going to do the right thing.

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