On Thu, 18 Jun 2015 11:58:48 +0100, Mark Brown wrote: > On Thu, Jun 18, 2015 at 12:19:04PM +0200, Noralf Trønnes wrote: > > > There is also an aux mini uart that shares interrupt with spi1/2. > > The AUXIRQ register determines the interrupt source. How should this > > sharing be done? This uart is really only useful on the Compute Module > > since it's pins overlap the pl011 uart pins on the other boards. > > This is how the mini uart is used/setup downstream: > > https://github.com/raspberrypi/linux/pull/1008 > > 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? -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
