Documentation about RS485 serial communications
Signed-off-by: NClaudio Scordino <claudio@evidence.eu.com>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Acked-by: NRussell King <linux@arm.linux.org.uk>
Acked-by: NGrant Edwards <grant.b.edwards@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>