| From | Arnd Bergmann <> | Subject | Re: [PATCH 06/14] mfd: Initialise the DB8500 PRCMU driver at core_initcall time | Date | Tue, 12 Jun 2012 12:59:38 +0000 |
| |
On Tuesday 12 June 2012, Lee Jones wrote: > On 11/06/12 22:01, Linus Walleij wrote: > > Hm what shall we do when we run out of initlevels? I think this was the > > kind of thing that deferred probe should solve. Usually changing this kind > > of thing has side effects so I'm a bit hesitant. > > Ah yes, I remember now. The IRQ domain needs to be in place before the > Device Tree is parsed by the Open Firmware subsystem. If it's not the > error "no irq domain found" is triggered and the IRQs are never mapped. > > I'd be happy to take a second opinion, but I believe this (and the other > core_initcall patch) is required.
It's still just a hack. The real solution that we discussed last time it came up is to defer the translation of irq numbers until device driver probe time, and bail out with -EPROBE_DEFER if you try to use a device whose interrupt is not available yet.
Arnd
|