Re: [PATCH 2/5] powerpc: Generic device tree for all AmigaOne boards

["Gerhard Pircher" <gerhard_pircher@gmx.net>]

-------- Original-Nachricht --------
> Datum: Mon, 12 Jan 2009 16:12:18 +1100
> Von: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> An: Gerhard Pircher <gerhard_pircher@gmx.net>
> CC: Grant Likely <grant.likely@secretlab.ca>, linuxppc-dev@ozlabs.org
> Betreff: Re: [PATCH 2/5] powerpc: Generic device tree for all AmigaOne boards

> The code in the kernel that retreives the interrupt that way is clearly
> marked as a fishy workaround for bogus firmwares :-)
"bogus" applies a little bit to the PCI init code of the A1 firmware. ;-)

> But I'm not going to reject things based on that, it will work for
> simple board using really only legacy interrupts like yours...
Thanks!

> > > For the flattened device tree, I think we've settled on the convention
> > > that every node with an IRQ connection should have both the
> > > interrupt-parent and interrupts properties.  (ie. don't rely on the
> > > parent node's interrupt-parent property.)
> > Even for ISA devices?
> 
> I disagree with Grant here. Especially in simple ISA cases like that,
> there's really no point in bloating the device-tree.
Okay, so I leave it as it is.

> > > Can this PCI device be probed?  Typically PCI devices don't get added
> > > to the flattened device tree because PCI is a probeable bus.
> > Yes, it can be probed. I thought it would be a good idea to include it,
> > because the IDE controller operates in legacy mode. I planned to specify
> > the two legacy interrupts in this node (as you can see), but the kernel
> > didn't like them.
> 
> Well, the kernel just didn't make use of them I'd say :-) But that can
> probably be fixed with the appropriate hacks. 
I think I throw away the IDE controller node for now, as libata just reads
the PCI register settings (progif) and I guess the IDE subsystem will do
the same in the future.

Gerhard

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