linux-kernel - Re: [RFC][PATCH] PM / Platform: Remove __weak definitions of runtime PM callbacks

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Message-ID: <20110407054459.GB6427@angua.secretlab.ca>
Date:	Wed, 6 Apr 2011 22:44:59 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Kevin Hilman <khilman@...com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Magnus Damm <magnus.damm@...il.com>,
	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Mundt <lethal@...ux-sh.org>, linux-sh@...r.kernel.org
Subject: Re: [RFC][PATCH] PM / Platform: Remove __weak definitions of runtime
 PM callbacks

On Wed, Apr 06, 2011 at 03:35:32PM -0700, Kevin Hilman wrote:
> Hi Rafael, Magnus,
> 
> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> 
> > From: Rafael J. Wysocki <rjw@...k.pl>
> >
> > Remove the __weak definitions of platform bus type runtime PM
> > callbacks, make platform_dev_pm_ops point to the generic routines
> > as appropriate and allow architectures using platform_dev_pm_ops to
> > replace the runtime PM callbacks in that structure with their own
> > set.
> >
> > Convert architectures providing its own definitions of the platform
> > runtime PM callbacks to use the new mechanism.
> >
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> 
> I dont't think we should be adding yet another new interface for setting
> platform-specific runtime PM ops.
> 
> We now have 3.  Two existing ones:
> 
> 1) new device power domains (presumably preferred)
> 2) platform_bus_set_pm_ops() (disliked by many)
> 
> and now the new one you create here
> 
> 3) platform_set_runtime_pm_ops()
> 
> This new one is basically the same as platform_bus_set_pm_ops(), but
> targetted only at runtime PM ops, and also has all the same problems
> that have been discussed before.  Namely, it overrides the pm ops for
> *every* device on the platform_bus, instead of targetting only specific
> devices.  With the new device power domains, we can target specific
> devices.
> 
> Wouldn't the right way to go here be to convert mach-shmobile over to
> using device power domains?

I agree.  +1

g.
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