MCR_LOOP          120 arch/arm/mach-pxa/include/mach/regs-uart.h #define MCR_LOOP	(1 << 4)
MCR_LOOP          135 arch/sh/include/asm/smc37c93x.h #define MCR_LOOP	0x1000	/* Loop */
MCR_LOOP          185 drivers/net/hamradio/yam.c #define MCR_LOOP	0x10			/* Loopback enable */