The FDT specification describes a string length of e.g. the begin_node of 1 to 31 chars and enforces a strict character limitation described in https://devicetree-specification.readthedocs.io/en/stable/devicetree-basics.html#node-name-requirements.

Enforcing the character limitation would mean adding a dependency on regex, which is undesirable. We could instead enforce the size limitation, and document the character limitation as something that is not currently validated.

@danielverkamp what do you think?