Help: commit 6112d58 breaks my kernel boot

[Conor Dooley <conor@kernel.org>]

On Tue, Dec 26, 2023 at 12:28:52PM -0500, Gabriel L. Somlo wrote:
> On Tue, Dec 26, 2023 at 12:19:22PM -0500, Gabriel L. Somlo wrote:
> > On Tue, Dec 26, 2023 at 05:11:00PM +0000, Conor Dooley wrote:
> > > On Tue, Dec 26, 2023 at 11:59:41AM -0500, Gabriel L. Somlo wrote:
> > > > Hi,
> > > > 
> > > > I recently updated my opensbi sources, and noticed that commit
> > > > 6112d58 ("lib: utils/fdt: Allow to use reg-names when parsing ACLINT")
> > > > breaks booting the (latest upstream) kernel on my LiteX + 4-core Rocket
> > > > setup. Without that commit, the kernel boots fine. With the commit
> > > > applied, I get:
> > > 
> > > > 		L2: clint at 2000000 {
> > > > 			compatible = "riscv,clint0";
> > > > 			interrupts-extended = <&L4 3 &L4 7 &L14 3 &L14 7 &L24 3 &L24 7 &L34 3 &L34 7>;
> > > > 			reg = <0x2000000 0x10000>;
> > > 
> > > > 			reg-names = "control";
> > > 
> > > If you remove this does it boot?
> > > 
> > 
> > Yes, removing the `reg-names` line from the clint node allows the
> > kernel to boot without issues.
> 
> I have to wonder, though, is that the "proper" fix, or just a
> temporary workaround? Is the `reg-names` entry actively "wrong"
> in the context of the rest of my clint node, or is parsing in opensbi
> actually buggy at the moment?

The parsing in OpenSBI is binding compliant (as far as I can see from a
brief look at the commit you identified) but I suppose it could be
limited to avoid checking reg-names for things matching the regular clint,
if there are a lot of incorrect devicetrees out there likely to be
affected.
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