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The tty-driver open routine is mandatory, but the serdev tty-port-controller implementation did not treat it as such and would instead fall back to calling tty_port_open() directly. Signed-off-by: Johan Hovold <johan@kernel.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>