linux-kernel - Re: [PATCH/RFC 0/6] ARM: runtime PM: consolidate runtime PM implementations

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Message-ID: <87hbaa7zhs.fsf@ti.com>
Date:	Thu, 07 Apr 2011 10:17:03 -0700
From:	Kevin Hilman <khilman@...com>
To:	"Rafael J. Wysocki" <rjw@...e.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH/RFC 0/6] ARM: runtime PM: consolidate runtime PM implementations

Kevin Hilman <khilman@...com> writes:

[...]

> Replacing the PM ops for all devices was done on OMAP and SH-mobile
> because that was the only approach we had.  Now that we have device
> power domains (thanks Rafael!), we can be more selective about which
> devices to apply them to.
>
> Note that my RFC patch/series did not do the selective part of deciding
> which devices to override and which ones not to, that part will be
> platform specific.  

Actually, thinking about this a little more, my patch actually does
select only relevant devices, and not *all* platform devices.

In my patch, the device power domain pointers are only added for devices
where a clk_get() actually succeeds.  In the original version, the
runtime PM hooks are overridden for *all* platform devices, but ones
that have no clock (or where clk_get() failed) have the additional
overhead of still calling the custom PM ops, but the custom ops have
nothing to do.

Kevin

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