Re: [Buildroot] [PATCH v3 1/2] linux: add support for device tree overlays

[Niklas Cassel <Niklas.Cassel@wdc.com>]

Hello Michael,

On Fri, Dec 13, 2024 at 10:35:37AM +0100, Michael Walle wrote:
> Hi Niklas,
> 
> > > > -Dropped support for out-of-tree device tree overlays, as Linux 6.12 no
> > > >  longer supports building an out-of-tree device tree by simply copying
> > > >  it to the kernel source directory (without also modifying the Makefile).
> > > 
> > > Why is that? As it seems, it is not possible to compile it by simply
> > > copying to arch/<arch>/dts (which is buildroot doing currently)
> > > anymore. But copying it to arch/<arch>/dts/<vendor>/ is working.
> > > Correct?
> >
> > I'm assuming that neither works anymore, see:
> > https://lore.kernel.org/buildroot/CAFOYHZDQmMRuK76TpOSAOFPdqAb4gpw=LNKfmpu=sqAD1EMhFg@mail.gmail.com/T/#u
> > https://lore.kernel.org/all/CAK7LNAR4h6NZ+D0BK+q4VQBeHWpjzRBQFQ9ovBrftM=6dHRcUg@mail.gmail.com/
> > https://lore.kernel.org/buildroot/Z1nq_gneO4ORw3EG@curiosity/T/#t
> 
> Thanks for the pointers.
> 
> But I've just tested both compiling .dts and .dtso from within a
> vendor directory and it seems to be working on next-20241213 (?).

If you say that copying to arch/<arch>/dts/<vendor>/ is still working, then
most likely it is only copying to arch/<arch>/dts that is no longer working.

I still think that this patch can be merged as is.

Once the BR2_LINUX_KERNEL_CUSTOM_DTS_PATH mess has been sorted, someone could
add support for out-of-tree device tree overlays, if anyone wants/needs that.

Adding support for in-tree device tree overlays now, does not make life harder
for anyone if they want to add support for out-of-tree device tree overlays in
the future.


Kind regards,
Niklas
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