Re: Some slightly random musings on device tree expression syntax

I was thinking some more about how to expand the device tree syntax to
allow expressions.

Excellent!

I wondered if we should use a concept/syntax more
inspired by template processors. Playing with jinja2 and gpp led me
towards (...) being an inline expression syntax that can calculate
integers or strings and get replaced by the string representation of the
expression, and ! at the start of a line introducing a statement
context. So, below are my somewhat wandering thoughts on the matter.
However, the idea still raises a lot of questions that'd need to be
resolved.

I note a few things:

* Using the (...) syntax to indicate which parts of the file should be
evaluated and the substituted solves the issue that David had with Jon's
proposal re: how do you know when a node name is literal text vs.
concatenated to some expression.

So the M4 solution then.

* As an aside, I wonder if we couldn't transparently allow <1 2 3> or
<1, 2, 3> for cell list syntax, thus not requiring the brackets in
previously proposed <(1 + 0) (1 + 1) (4 - 1)> syntax, but rather <1 + 0,
1 + 1, 4 - 1>?

That's the sort of direction I advocated earlier.

jdl