Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware

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On Wed, 2015-04-15 at 15:19 +0200, Greg Kroah-Hartman wrote:
> On Wed, Apr 15, 2015 at 11:32:29AM +0000, Kweh, Hock Leong wrote:
> > > -----Original Message-----
> > > From: Greg Kroah-Hartman [mailto:gregkh@xxxxxxxxxxxxxxxxxxx]
> > > Sent: Tuesday, April 14, 2015 10:09 PM
> > > 
> > > On Tue, Apr 14, 2015 at 05:44:56PM +0800, Kweh, Hock Leong wrote:
> > > > + */
> > > > +static void __exit efi_capsule_loader_exit(void)
> > > > +{
> > > > +	platform_device_unregister(efi_capsule_pdev);
> > > 
> > > This is not a platform device, don't abuse that interface please.
> > > 
> > > greg k-h
> > 
> > Okay, so you would recommend to use device_register() for this case?
> > Or you would think that this is more suitable to use class_register()?
> 
> A class isn't needed, you just want a device right?  So just use a
> device, but not a platform device, as that isn't what you have here.

Coming back to this, am I the only one confused here?  What is a
'platform device' then?  Because if it doesn't fit a direct channel to
the platform firmware, which seems to be one of the definitions covered
in driver-model/platform.txt under devices with minimal infrastructure
then perhaps the documentation needs updating.

James


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