spi: bcm2835: driver for "auxiliar" spi1/spi2
broonie at kernel.org
Tue Jul 7 06:51:13 PDT 2015
On Thu, Jun 25, 2015 at 07:42:19PM +0200, Jakub Kiciński wrote:
> On Thu, 18 Jun 2015 11:58:48 +0100, Mark Brown wrote:
> > Linux supports shared interrupts perfectly fine, though it sounds like
> > this is actually a cascaded interrupt (the demux is another interrupt
> > controller) which we also support just fine.
> Mark, could you give us a hint how to best go about this shared IRQ?
> I failed to find any generic interrupt controller. I imagine there
> should be some fake irqchip we can instantiate from DT giving it a
> irq line and a memory address and it should provide us with 32(bit)
> demuxed irqs based on status of bits in specified memory location.
> Does this sound reasonable? Does such fake irqchip driver exist?
IIRC there's some basic MMIO interrupt controller but I don't know off
the top of my head where, if not it shouldn't be too hard to implement.
It does sound sensible.
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