Describe an altera-passive-serial devicetree entry, required features
Signed-off-by: NJoshua Clayton <stillcompiling@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NAlan Tull <atull@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>