OMAP_PORT_SHIFT    15 arch/arm/include/debug/omap2plus.S #define OMAP_PORT_SHIFT		2
OMAP_PORT_SHIFT    30 arch/arm/mach-omap1/include/mach/serial.h #define OMAP_PORT_SHIFT		2
OMAP_PORT_SHIFT    52 arch/arm/mach-omap2/include/mach/serial.h #define OMAP_PORT_SHIFT		2