[U-Boot] [RFC] SPDX License text updates

[Wolfgang Denk <wd@denx.de>]

Dear Tom,

In message <20180122170607.GL32220@bill-the-cat> you wrote:
> 
> In another thread Felix Brack brought up that as of version 3.0 of SPDX,
> there's a number of deprecated tags (see https://spdx.org/licenses/) and
> that we're using at least one of them.
> 
> Specifically, "GPL-2.0+" should be "GPL-2.0-or-later".

OK...

> Now, we have a few options here:
> - Deprecated isn't removed.  SPDX specifically says the old links shall
>   remain valid, etc, etc.  We could continue to use "GPL-2.0+", etc and
>   not have to change (literally) 8000 files.  This will also keep us in
>   line with what the Linux kernel currently does.  I also have no idea,
>   nor have I looked to see if that's going to change.
> - Allow both old and new.  Both are valid, the newer form allows for
>   easier tooling and more precise management of options that I'm not
>   sure apply to our use cases.

Both sound not really attractive to me.

> - Switch to the new tags.  A few hour I imagine of playing around with
>   sed and then manual fixups and I can probably convert all the existing

Umm... where do you expect problems?  Running for example

	fgrep -hR GPL-2.0+ * | sort -u | less

gives a realtively short list which looks harmless to me.

>   cases to the new syntax (we have some DTS files for example with
>   (GPL-2.0+ OR MIT) which would become (GPL-2.0-or-later OR MIT).  But

Yes, and why do you think this would be a problem?

We have a few other places that don't match current SPDX
spcification, like all these

	GPL-2.0+        BSD-2-Clause
	GPL-2.0+        BSD-3-Clause
	GPL-2.0+ or X11
	GPL-2.0+        X11
	|____GPL-2.0+

but these cases are few and easy to spot.  I currentlse see neither
the need for "few hour of playing around with sed" nor the need for
manual fxes - a plain string substitution should work just fine, and
we could even clean up the other inconsistencies whil we are at it.

I vote for 3 plus additional cleanup.


Best regards,

Wolfgang Denk

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