linux-kernel - Re: platform/i2c busses: pm runtime and system sleep

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Message-Id: <201012171425.07775.rjw@sisk.pl>
Date:	Fri, 17 Dec 2010 14:25:07 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Rabin Vincent <rabin@....in>, stern@...land.harvard.edu,
	linux-pm@...ts.linux-foundation.org, linux-i2c@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: platform/i2c busses: pm runtime and system sleep

On Friday, December 17, 2010, Mark Brown wrote:
> On Thu, Dec 16, 2010 at 11:56:57PM +0530, Rabin Vincent wrote:
> 
> > There seem to be some differences between the generic ops and the i2c
> > and platform busses' implementations of the interaction between runtime
> > PM and system sleep:
> 
> >   (1) The platform bus does not implement the
> >       don't-call-pm->suspend()-if pm_runtime_suspended()-returns-true
> >       functionality implemented by the generic ops and i2c.
> 
> This is platform lagging behind I2C in implementation - both originally 
> did what platform does and then I2C was updated and platform wasn't.
> 
> It'd be really good if this could all be factored out into the PM core,
> we're going to have to do the same thing for at least SPI as well and
> possibly some other buses :/

So how exactly the PM core is supposed to include those things?

There certainly are other buses that don't want to do them.

Thanks,
Rafael
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