spi: bcm2835: driver for "auxiliar" spi1/spi2

Mark Brown broonie at kernel.org
Thu Jun 18 03:58:48 PDT 2015

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.
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