Re: [PATCH 1/2] libfdt: overlay: Allow resolving phandle symbols

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Sep 23, 2024 at 11:12:02AM +0200, Geert Uytterhoeven wrote:
> Hi David,
> 
> On Mon, Sep 23, 2024 at 10:41 AM David Gibson
> <david@gibson.dropbear.id.au> wrote:
> > On Mon, Sep 23, 2024 at 10:22:03AM +0200, Geert Uytterhoeven wrote:
> > > On Mon, Sep 23, 2024 at 5:41 AM David Gibson
> > > <david@gibson.dropbear.id.au> wrote:
> > > > So, essentially you're just adding new labels as aliases to existing
> > > > labels?
> > > >
> > > > Ok, I can see at least two ways of doing that which I think are a more
> > > > natural fit than allowing symbols to be phandles.
> > >
> > > [...]
> > >
> > > > # Method 2: /aliases
> > >
> > > Does the (Linux) DT overlay code support updating aliases?
> > > Last time I needed that (almost a decade ago), it did not.
> >
> > Huh.  I hadn't realised the kernel kept a separate cache of aliases
> > that wasn't updated.  Assuming that's still the case, that would
> > complicate matters a bit.
> 
> Indeed.

Actually, in a sense this is just an aspect of a more general thing:
libfdt's is not the only relevant implementation of overlays.  If you
want to extend what overlays can do, you need to consider the kernel
implementation too.

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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