devicetree and IRQ7 mapping for T1042(mpic)
Scott Wood
scottwood at freescale.com
Thu Oct 15 11:14:32 AEDT 2015
On Wed, 2015-10-14 at 19:11 -0500, Scott Wood wrote:
> On Wed, 2015-10-14 at 19:37 +0000, Joakim Tjernlund wrote:
> > I am trying to figure out how to describe/map external IRQ7 in the
> > devicetree.
> >
> > Basically either IRQ7 to be left alone by Linux(becase u-boot already set
> > it up)
> > or map IRQ7 to sie 0(MPIC_EILR7=0xf0) and prio=0xf(MPIC_EIVPR7=0x4f0000)
> >
> > There is no need for SW handler because IRQ7 will be routed to the DDR
> > controller
> > and case an automatic Self Refresh just before CPU reset.
> >
> > I cannot figure out how to do this. Any ideas?
> >
> > If not possible from devicetree, then can one do it from board code?
>
> The device tree describes the hardware. Priority is configuration, and
> thus
> doesn't belong there. You can call mpic_irq_set_priority() from board code.
>
> Likewise, the fact that you want to route irq7 to sie0 is configuration,
> not
> hardware description. At most, the device tree should describe is what is
> connected to each sie output. There's no current Linux support for routing
> an interrupt to sie or anything other than "int".
BTW, priority is meaningless for interrupts routed to sie.
-Scott
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