[RFC 00/15] Device Tree schemas and validation

quoted

Benoit,

Sorry, I meant to ask earlier but forgot.
Shouldn't this development be based on the
upstream DTC repository and not the in-kernel
copy of the DTC?

Eventually, yes,

We should *start* there, though.

but here the main point is to discuss the schema that 
will be used to defined bindings.
In that case, the DTC patches code are mostly a proof of concept

Sure; all that is fine.

using the Linux kernel as example.

Example?(*)  We shouldn't churn the kernel.

jdl

(*) In the sense that *this* Universe is just
    one example from all known Universes? :-)