linux-kernel - Re: [PATCH v4] ARM: dts: sun8i: Add dts file for Olimex A33-OLinuXino

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Message-ID: <20160727062146.GA6560@lukather>
Date:	Wed, 27 Jul 2016 08:21:46 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	stefan.mavrodiev@...il.com
Cc:	dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@...linux.org.uk, wens@...e.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com
Subject: Re: [PATCH v4] ARM: dts: sun8i: Add dts file for Olimex A33-OLinuXino

On Wed, Jul 27, 2016 at 08:12:29AM +0300, stefan.mavrodiev@...il.com wrote:
> > > +&reg_dcdc1 {
> > > +	regulator-always-on;
> > > +	regulator-min-microvolt = <3300000>;
> > > +	regulator-max-microvolt = <3300000>;
> > > +	regulator-name = "vcc-dsi";
> > > +};
> > 
> > What is it used for? Is it really necessary to keep it on at all time?
> 
> I think so.
> This is the supply for the MMC.

Then it's poorly named, and you should tie it to the MMC, and remove
the always-on if it's only used by the mmc. always-on is supposed to
be for regulators that shouldn't but turned off for the system to stay
running. Some MMC regulator doesn't fit that description.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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