linux-kernel - Re: [REPOST RFC PATCH 0/3] New "gpio-poweroff" driver to turn off platform devices with GPIOs

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Message-ID: <20111220143857.GU2866@opensource.wolfsonmicro.com>
Date:	Tue, 20 Dec 2011 14:38:58 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Moffett, Kyle D" <Kyle.D.Moffett@...ing.com>
Cc:	Rob Herring <robherring2@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>, Liam Girdwood <lrg@...com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [REPOST RFC PATCH 0/3] New "gpio-poweroff" driver to turn off
 platform devices with GPIOs

On Mon, Dec 19, 2011 at 07:53:06PM -0600, Moffett, Kyle D wrote:
> On Dec 19, 2011, at 20:38, Mark Brown wrote:

> > Well, it depends what you need to do.  In the ST-Ericsson case what they
> > needed to do was collapse the core supplies for the CPU.  But previously
> > you were talking about power domains, not whole system poweroff.
> > Usually a power domain is a subset of the full system power.

> Well, I have control of 3 separate power domains in the sense that
> there are 6 physically separate computers sharing a single supply,
> with 2 in each domain (and only 1 of the 6 controlling the shared
> supply).

OK, that's really not what people commonly understand by "power domain".
This is really only about system powerdown sequencing so a custom driver
is probably fine.
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