Linux-2.6.33.2/drivers/clocksource/Kconfig

config CS5535_CLOCK_EVENT_SRC
	tristate "CS5535/CS5536 high-res timer (MFGPT) events"
	depends on GENERIC_TIME && GENERIC_CLOCKEVENTS && CS5535_MFGPT
	help
	  This driver provides a clock event source based on the MFGPT
	  timer(s) in the CS5535 and CS5536 companion chips.
	  MFGPTs have a better resolution and max interval than the
	  generic PIT, and are suitable for use as high-res timers.