linux-kernel - Re: [PATCH 1/5] PM / Runtime: Support for generic I/O power domains (v4)

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Message-ID: <Pine.LNX.4.64.1106020920360.4067@axis700.grange>
Date:	Thu, 2 Jun 2011 09:29:35 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	Greg KH <gregkh@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	Kevin Hilman <khilman@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org,
	MyungJoo Ham <myungjoo.ham@...il.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 1/5] PM / Runtime: Support for generic I/O power domains
 (v4)

On Sat, 28 May 2011, Rafael J. Wysocki wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Introduce common headers, helper functions and callbacks allowing
> platforms to use simple generic power domains for runtime power
> management.
> 
> Introduce struct generic_power_domain to be used for representing
> power domains that each contain a number of devices and may be
> master domains or subdomains with respect to other power domains.
> Among other things, this structure includes callbacks to be
> provided by platforms for performing specific tasks related to
> power management (i.e. ->stop_device() may disable a device's
> clocks, while ->start_device() may enable them, ->power_off() is
> supposed to remove power from the entire power domain
> and ->power_on() is supposed to restore it).

I've got a generic question to this: do we have any examples of 
power-domain specific ->start_device() and ->stop_device() callbacks? A 
common case is, when these callbacks start and stop clocks, associated 
with the device, but this is not power-domain specific, right? Do we have 
any examples of different power domains in a system, having different 
these calbacks, but all devices in one power-domain, having the same ones?

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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