Re: [PATCH 5/5] arm: omap: Proper cleanups for omap_device

[Alexander Holler]

Am 07.08.2013 07:52, schrieb Greg Kroah-Hartman:
> On Tue, Aug 06, 2013 at 03:37:13PM +0200, Alexander Holler wrote:
> > Am 06.08.2013 12:14, schrieb Greg Kroah-Hartman:
> >
> > > > What exactly is a platform device anyway?
> > >
> > > Originally it was a "something that wasn't connected to a bus, but just
> > > had memory-mapped i/o."  Like the PS2 keyboard controller.
> > >
> > > Embedded systems got ahold of this and went to town, and made everything
> > > a platform device because they could, and no one was paying attention.
> > >
> > > Then OF came along and used it as well, and you know the rest...
> > >
> > > I think we need to get the ACPI and OF people, and me, in a room
> > > together at the kernel summit and not let us out until we have this all
> > > worked out.
> >
> > MFD uses platform devices too.
>
> Ugh, I've been avoiding looking at mfd for a long time now, and really
> don't want to start now...

I've just mentioned it to suggest that platform devices seem to be used 
all over the kernel as the generic (minimal) form of a device driver. At 
least that is the impression I've got.

Regards,

Alexander Holler

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