On 1/12/21 4:16 AM, Bill Mills wrote:

On 1/12/21 3:37 AM, Viresh Kumar wrote:

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On 11-01-21, 20:22, Bill Mills wrote:

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On 1/11/21 5:06 PM, Frank Rowand wrote:

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NACK to this specific patch, in its current form.

There are restrictions on applying an overlay at runtime that do not apply
to applying an overlay to an FDT that will be loaded by the kernel during
early boot.  Thus the unittest overlays _must_ be applied using the kernel
overlay loading methods to test the kernel runtime overlay loading feature.

I agree that testing fdtoverlay is a good idea.  I have not looked at the
parent project to see how much testing of fdtoverlay occurs there, but I
would prefer that fdtoverlay tests reside in the parent project if practical
and reasonable.  If there is some reason that some fdtoverlay tests are
more practical in the Linux kernel repository then I am open to adding
them to the Linux kernel tree.

I wasn't looking to add any testing for fdtoverlay in the kernel, but
then I stumbled upon unit-tests here and thought it would be a good
idea to get this built using static tools as well, as we aren't
required to add any new source files for this and the existing tests
already cover a lot of nodes.

And so I am fine if we don't want to do this stuff in kernel.

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I thought we were aligned that any new overlays into the kernel today would
only be for boot loader applied case.  Applying overlays at kernel runtime
was out of scope at your request.

Rob had requested that the overlays be test applied at build time.  I don't
think there is any way to test the kernel runtime method at build time
correct?

Please clarify your concern and your suggested way forward.

The kernel does some overlay testing currently (at kernel boot only,
not later), to see if the overlays get applied correctly or not, these
are the unit tests.

What Frank is probably saying is that the unit-tests dtbs shouldn't
get used for testing fdtoverlay stuff. He isn't asking to support
runtime application of overlays, but to not do fdtoverlay testing in
the kernel.

Yes, Viresh is understanding my point.

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Thanks Viresh, that makes sense.  Sorry for the confusion Frank.

No problem Bill, communication by email is hard, and we end up
spending a lot of time getting to the point of common understanding,
it is the nature of the process.

-Frank