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

From: Alexander Holler
Date: Wed Aug 07 2013 - 11:24:29 EST

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.


Alexander Holler

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