arm qemu test failures due to 'driver-core: platform: probe of-devices only using list of compatibles'

Hello Russell,

On Mon, Feb 15, 2016 at 08:58:18AM +0000, Russell King - ARM Linux wrote:

On Mon, Feb 15, 2016 at 09:17:50AM +0100, Uwe Kleine-K?nig wrote:

quoted

On Sun, Feb 14, 2016 at 08:07:55PM +0000, Russell King - ARM Linux wrote:

quoted

On Sun, Feb 14, 2016 at 08:55:01PM +0100, Uwe Kleine-K?nig wrote:

quoted

So the unexpected abnormality here is that even though this device is
instantiated by dt, the driver doesn't provide any compatibles.
Either my expectation is wrong, then 67d02a1bbb33455 should be reverted

Your expectation is wrong.  AMBA primecell devices have hardware IDs
and are matched to their drivers by those IDs.  Just like PCI.

pci devices don't appear in dt, do they? I don't see the connection
between amba devices and platform devices, see my other mail in this
thread for some more details.

They both have hardware IDs, and they are both matched via those hardware
IDs.

I changed platform_match which is about matching by dt compatible, acpi
and/or device name. I don't see how this can affect an amba device given
they match to a driver by a hardware id.

Your change has introduced a regression and is therefore wrong.

I'd like to understand though why and how my commit is wrong to be able
to fix it instead of getting it reverted.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |