linux-kernel - Re: [PATCH 4/4] mfd: global Suspend and resume support of ehci and ohci

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Date:	Sun, 5 Jun 2011 19:19:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	balbi@...com
Cc:	Keshava Munegowda <keshava_mgowda@...com>,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, gadiyar@...com,
	sameo@...ux.intel.com, parthab@...ia.ti.com, tony@...mide.com,
	khilman@...com, b-cousson@...com, paul@...an.com
Subject: Re: [PATCH 4/4] mfd: global Suspend and resume support of ehci and ohci

On Wednesday, June 01, 2011, Felipe Balbi wrote:
> Hi,
> 
> On Wed, Jun 01, 2011 at 03:54:38PM +0200, Rafael J. Wysocki wrote:
> > > +static const struct dev_pm_ops usbhsomap_dev_pm_ops = {
> > > +	.suspend	= usbhs_suspend,
> > > +	.resume		= usbhs_resume,
> > > +};
> > 
> > Please add .freeze()/.thaw() and .poweroff()/.restore() callbacks too.
> > They may point to the same routines, but must be present.
> > 
> > You can actually use the SIMPLE_DEV_PM_OPS() convenience macro for this
> > purpose.
> 
> good point. BTW, do we need this #ifdef CONFIG_PM stuff which has been
> popping on most drivers recently ? To me it looks like driver.pm field
> is always available even if PM is disabled, so what's the point ? Saving
> a few bytes ?

Basically, yes (you may want to avoid defining the object this points to if
CONFIG_PM is unset).

Thanks,
Rafael
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