linux-kernel - Re: [RFC][PATCH 1/2] PM / Runtime: Support for generic I/O power domains

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Date:	Fri, 29 Apr 2011 13:54:56 -0700
From:	Greg KH <gregkh@...e.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	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
Subject: Re: [RFC][PATCH 1/2] PM / Runtime: Support for generic I/O power
 domains

On Fri, Apr 29, 2011 at 01:54:55AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Introcude 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_on() is
> supposed to remove power from the entire power domain
> and ->power_off() is supposed to restore it).
> 
> Introduce functions that can be used as power domain runtime PM
> callbacks, pm_genpd_runtime_suspend() and pm_genpd_runtime_resume(),
> as well as helper functions for the initialization of a power
> domain represented by a struct generic_power_domain object,
> adding a device to or removing a device from it and adding or
> removing subdomains.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  drivers/base/power/Makefile |    2 
>  drivers/base/power/domain.c |  416 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/pm.h          |    3 
>  include/linux/pm_domain.h   |   82 ++++++++
>  4 files changed, 501 insertions(+), 2 deletions(-)

If this solves the power domain issue, and no one has any problems with
getting to work on their platforms, it looks great to me.

Very nice job:
	Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

thanks,

greg k-h
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