dt: document the of_serial bindings

The of_serial bindings can be used to register a number of serial
devices.  Document this binding with all of the others.

v3: remove device-type and clarify used-by-rtas

Signed-off-by: Jamie Iles <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
1 file changed