linux-kernel - Re: Proposal: I2C device power (Was: hwmon: (lm90) Add power control)

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Message-ID: <20130809110931.GX6427@sirena.org.uk>
Date:	Fri, 9 Aug 2013 12:09:31 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Alexander Shiyan <shc_work@...l.ru>
Cc:	Wei Ni <wni@...dia.com>, swarren@...dotorg.org,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	linux-tegra@...r.kernel.org, MLongnecker@...dia.com,
	linux-arm-kernel@...ts.infradead.org, khali@...ux-fr.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: Proposal: I2C device power (Was: hwmon: (lm90) Add power control)

On Fri, Aug 09, 2013 at 02:50:11PM +0400, Alexander Shiyan wrote:

> > This would need to be an array of supplies, relatively few devices need
> > only a single power supply.  This is also not something that should be
> > handled in I2C, power is not something that's uniquely needed by devices
> > on an I2C bus.

> Additional regulators can be handled in the driver, or "parent"-scheme can
> be used. Is not it?

Given how common it is to have multiple supplies it seems sensible to
just handle that in the core - it's common to have a digital supply and
an analogue supply for example.  The regulator framework already has
APIs for working with multiple regulators in a single call so it's not
going to be much more effort on the framework side.

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