Re: [PATCH] arm64: dts: ti: k3-j721s2: fix overlapping GICD memory region

[Robin Murphy]

On 2022-06-16 13:13, Marc Zyngier wrote:
> On Thu, 16 Jun 2022 13:07:23 +0100,
> Robin Murphy <robin.murphy@xxxxxxx> wrote:
> > On 2022-06-16 11:51, Matt Ranostay wrote:
> > > GICD region was overlapping with GICR causing the latter to not map
> > > successfully, and in turn the gic-v3 driver would fail to initialize.
> > >
> > > This issue was hidden till commit 2b2cd74a06c3 ("irqchip/gic-v3: Claim iomem resources")
> > > replaced of_iomap() calls with of_io_request_and_map() that internally
> > > called request_mem_region().
> > >
> > > Respective console output before this patchset:
> > >
> > > [    0.000000] GICv3: /bus@100000/interrupt-controller@1800000: couldn't map region 0
> >
> > Oh, it's nice that this finds bugs, but it seems I hadn't fully
> > considered that making the simple easy change in the DT paths results
> > in different behaviour from ACPI.
> >
> > Marc, would you like a fix for this to remain non-fatal even in the
> > face of a dodgy DT, or are you happy with being a bit stricter now?
>
> I'd rather we work around it. I shout at people for breaking existing
> DTs, so this should apply to the GIC as well. A nice WARN_ON_ONCE()
> should do, if you don't mind writing the patch.

Indeed, I think that would be my default preference as well - apologies 
for the oversight! I'll spin the patch shortly (and make the warning 
consistent for the ACPI side too).

Cheers,
Robin.