TTY: amiserial, provide carrier helpers
This is a preparation for a switch to tty_port_block_til_ready. We need amiga_carrier_raised and amiga_dtr_rts. The implementation is taken from startup, shutdown and current block_til_ready. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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