linux-kernel - Re: [PATCH 1/4] devicetree: add a binding for a regulator that constrains its supply

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Message-ID: <20141124151527.GC7712@sirena.org.uk>
Date:	Mon, 24 Nov 2014 15:15:27 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Alban Bedel <alban.bedel@...onic-design.de>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Grant Likely <grant.likely@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 1/4] devicetree: add a binding for a regulator that
 constrains its supply

On Mon, Nov 24, 2014 at 02:02:00PM +0100, Alban Bedel wrote:

> +Constrained Supply Regulator
> +
> +This binding allow creating a virtual regulator that constrain its
> +supply to provides the requested voltage. This is to allow using
> +simple drivers that don't explicitly request a voltage on boards
> +that have adjustable hardware regulators.
> +
> +Required properties:
> +- compatible : Must be "regulator-constrained-supply".
> +- vin-supply : phandle to the parent supply/regulator node

Reading this description I'm at a loss to explain what this is intended
to achieve - it's obviously not describing hardware which is a rather
large alarm bell and I don't really understand why the constraints
wouldn't be set on the parent regulator.

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