linux-kernel - Re: [PATCH 3/10 v6] PM / Domains: Support for generic I/O PM domains (v7)

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Date:	Fri, 1 Jul 2011 22:03:58 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Kevin Hilman <khilman@...com>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Magnus Damm <magnus.damm@...il.com>,
	Paul Walmsley <paul@...an.com>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>, linux-sh@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 3/10 v6] PM / Domains: Support for generic I/O PM domains (v7)

On Friday, July 01, 2011, Kevin Hilman wrote:
> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> 
> > 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_pm_domain to be used for representing
> > power domains that each contain a number of devices and may be
> > parent 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).
> >
> > 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.
> >
> > Introduce configuration option CONFIG_PM_GENERIC_DOMAINS to be
> > selected by the platforms that want to use the new code.
> >
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> Reviewed-by: Kevin Hilman <khilman@...com>

Thanks!

> While I still don't think this is generic enough for some more
> complicated SoCs, it most certainly a huge step in the right direction,
> and I think we can address the other complexities with additional
> patches as needed.

That's my intention.

> Thanks Rafael for all your hard work on this and putting up with my
> nagging. ;)

I don't mind that at all, it kind of helps to focus on important stuff. ;-)

Rafael

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