Re: [PATCH] of/irq: provide int of_irq_parse_and_map_pci wrapper

[Lucas Stach <l.stach@pengutronix.de>]

Am Freitag, den 09.05.2014, 10:45 +0200 schrieb Arnd Bergmann:
> On Friday 09 May 2014 10:28:39 Lucas Stach wrote:
> > Am Freitag, den 09.05.2014, 08:58 +0200 schrieb Arnd Bergmann:
> > > The pci-rcar driver is enabled for compile tests, and this has
> > > now shown that the driver cannot build without CONFIG_OF,
> > > following the inclusion of f8f2fe7355fb "PCI: rcar: Use new OF
> > > interrupt mapping when possible":
> > > 
> > > drivers/built-in.o: In function `rcar_pci_map_irq':
> > > :(.text+0x1cc7c): undefined reference to `of_irq_parse_and_map_pci'
> > > 
> > > As pointed out by Ben Dooks and Geert Uytterhoeven, this is actually
> > > supposed to build fine, which we can achieve if we make the
> > > declaration of of_irq_parse_and_map_pci conditional on CONFIG_OF
> > > and provide an empty inline function otherwise, as we do for
> > > a lot of other of interfaces.
> > > 
> > > This lets us build the rcar_pci driver again without CONFIG_OF,
> > > which won't work but give us compile time coverage.
> > > 
> > This part of the commit message is confusing. The driver is explicitly
> > written to fall back to a platform irq when OF interrupt mapping doesn't
> > work (return 0 or error), to keep non DT enabled boards working.
> > 
> > I hadn't thought of the compile time dependency, so thanks for fixing
> > this up.
> 
> I thought it was meant to keep old DTBs working. AFAIK, there is no
> legacy board file support for rcar-gen2, so we don't actually have to
> worry about that.
> 
I haven't watched closely, but at the time of writing the patch the were
some board files in flight which used the rcar-pci.  All I wanted to say
is that with your patch applied things continue to work, at least at the
same level as before my change, but I really don't care too much about
the details.

Regards,
Lucas
-- 
Pengutronix e.K.             | Lucas Stach                 |
Industrial Linux Solutions   | http://www.pengutronix.de/  |