Convert the serial slave-device Device Tree binding documentation to
json-schema, and incorporate it into the generic serial bindings.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NMatthias Brugger <mbrugger@suse.com>
Signed-off-by: NRob Herring <robh@kernel.org>