XCLK_MASK         812 drivers/tty/serial/ip22zilog.c 	up->curregs[R4] &= ~XCLK_MASK;
XCLK_MASK         877 drivers/tty/serial/sunzilog.c 	up->curregs[R4] &= ~XCLK_MASK;
XCLK_MASK         889 drivers/tty/serial/zs.c 	zport->regs[4] &= ~(XCLK_MASK | SB_MASK | PAR_ENA | PAR_EVEN);