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

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Date:	Fri, 01 Jul 2011 11:11:13 -0700
From:	Kevin Hilman <khilman@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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)

"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>

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.

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

Kevin
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