What:		/sys/class/devfreq/.../
Date:		September 2011
Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
Description:
		Provide a place in sysfs for the devfreq objects.
		This allows accessing various devfreq specific variables.
		The name of devfreq object denoted as ... is same as the
		name of device using devfreq.

What:		/sys/class/devfreq/.../governor
Date:		September 2011
Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
Description:
		The /sys/class/devfreq/.../governor shows the name of the
		governor used by the corresponding devfreq object.

What:		/sys/class/devfreq/.../cur_freq
Date:		September 2011
Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
Description:
		The /sys/class/devfreq/.../cur_freq shows the current
		frequency of the corresponding devfreq object. Same as
		target_freq when get_cur_freq() is not implemented by
		devfreq driver.

What:		/sys/class/devfreq/.../target_freq
Date:		September 2012
Contact:	Rajagopal Venkat <rajagopal.venkat@linaro.org>
Description:
		The /sys/class/devfreq/.../target_freq shows the next governor
		predicted target frequency of the corresponding devfreq object.

What:		/sys/class/devfreq/.../polling_interval
Date:		September 2011
Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
Description:
		The /sys/class/devfreq/.../polling_interval shows and sets
		the requested polling interval of the corresponding devfreq
		object. The values are represented in ms. If the value is
		less than 1 jiffy, it is considered to be 0, which means
		no polling. This value is meaningless if the governor is
		not polling; thus. If the governor is not using
		devfreq-provided central polling
		(/sys/class/devfreq/.../central_polling is 0), this value
		may be useless.

What:		/sys/class/devfreq/.../userspace/set_freq
Date:		September 2011
Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
Description:
		The /sys/class/devfreq/.../userspace/set_freq shows and
		sets the requested frequency for the devfreq object if
		userspace governor is in effect.