linux-kernel - Re: Question: How to power-manage UART-attached devices.

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Message-ID: <20120430223322.GA3951@sirena.org.uk>
Date:	Mon, 30 Apr 2012 23:33:22 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	NeilBrown <neilb@...e.de>
Cc:	linux-serial@...r.kernel.org, linux-pm@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Question:  How to power-manage UART-attached devices.

On Tue, May 01, 2012 at 08:22:09AM +1000, NeilBrown wrote:

>  The question is how can user-space tell the kernel that these devices are
>  'inactive'?

>  I would like to integrate this into Linux in the most  "natural" way that I
>  can but am having trouble.  My current approach involves using "rfkill" but
>  that doesn't work very well for reasons that are probably not very relevant
>  here.  It probably does make sense for powering the GPS antenna, but not
>  much else.

The userspace consumer was added for users like this that live entirely
in userspace.
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