tree ab76ae4e898e1f4ddd1cf753ce950b442d80245c
parent e418c63005850dbeeb3d152d81560640d7754294
author Simon Glass <sjg@chromium.org> 1685636551 -0600
committer Tom Rini <trini@konsulko.com> 1689353690 -0400

dm: core: Avoid registering an inaccessible tree

At present there are various restrictions on the use of livetree:

- It is only available once the tree is unflattened, i.e. after relocation
- It is designed to be used with the control FDT
- It can (in principle) be used with other FDTs, but only if they are
  unflattened first; this is not supported

Add a few checks to make sure that any tree that is created is actually
valid. Otherwise it can be confusing when nodes and properties cannot
actually be accessed.

Signed-off-by: Simon Glass <sjg@chromium.org>