1What:		/sys/class/devfreq/.../
  2Date:		September 2011
  3Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
  4Description:
  5		Provide a place in sysfs for the devfreq objects.
  6		This allows accessing various devfreq specific variables.
  7		The name of devfreq object denoted as ... is same as the
  8		name of device using devfreq.
  9
 10What:		/sys/class/devfreq/.../name
 11Date:		November 2019
 12Contact:	Chanwoo Choi <cw00.choi@samsung.com>
 13Description:
 14		The /sys/class/devfreq/.../name shows the name of device
 15		of the corresponding devfreq object.
 16
 17What:		/sys/class/devfreq/.../governor
 18Date:		September 2011
 19Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 20Description:
 21		The /sys/class/devfreq/.../governor show or set the name of the
 22		governor used by the corresponding devfreq object.
 23
 24What:		/sys/class/devfreq/.../cur_freq
 25Date:		September 2011
 26Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 27Description:
 28		The /sys/class/devfreq/.../cur_freq shows the current
 29		frequency of the corresponding devfreq object. Same as
 30		target_freq when get_cur_freq() is not implemented by
 31		devfreq driver.
 32
 33What:		/sys/class/devfreq/.../target_freq
 34Date:		September 2012
 35Contact:	Rajagopal Venkat <rajagopal.venkat@linaro.org>
 36Description:
 37		The /sys/class/devfreq/.../target_freq shows the next governor
 38		predicted target frequency of the corresponding devfreq object.
 39
 40What:		/sys/class/devfreq/.../trans_stat
 41Date:		October 2012
 42Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 43Description:
 44		This ABI shows or clears the statistics of devfreq behavior
 45		on a specific device. It shows the time spent in each state
 46		and the number of transitions between states.
 47		In order to activate this ABI, the devfreq target device
 48		driver should provide the list of available frequencies
 49		with its profile. If need to reset the statistics of devfreq
 50		behavior on a specific device, enter 0(zero) to 'trans_stat'
 51		as following::
 52
 53			echo 0 > /sys/class/devfreq/.../trans_stat
 54
 55What:		/sys/class/devfreq/.../available_frequencies
 56Date:		October 2012
 57Contact:	Nishanth Menon <nm@ti.com>
 58Description:
 59		The /sys/class/devfreq/.../available_frequencies shows
 60		the available frequencies of the corresponding devfreq object.
 61		This is a snapshot of available frequencies and not limited
 62		by the min/max frequency restrictions.
 63
 64What:		/sys/class/devfreq/.../available_governors
 65Date:		October 2012
 66Contact:	Nishanth Menon <nm@ti.com>
 67Description:
 68		The /sys/class/devfreq/.../available_governors shows
 69		currently available governors in the system.
 70
 71What:		/sys/class/devfreq/.../min_freq
 72Date:		January 2013
 73Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 74Description:
 75		The /sys/class/devfreq/.../min_freq shows and stores
 76		the minimum frequency requested by users. It is 0 if
 77		the user does not care. min_freq overrides the
 78		frequency requested by governors.
 79
 80What:		/sys/class/devfreq/.../max_freq
 81Date:		January 2013
 82Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 83Description:
 84		The /sys/class/devfreq/.../max_freq shows and stores
 85		the maximum frequency requested by users. It is 0 if
 86		the user does not care. max_freq overrides the
 87		frequency requested by governors and min_freq.
 88		The max_freq overrides min_freq because max_freq may be
 89		used to throttle devices to avoid overheating.
 90
 91What:		/sys/class/devfreq/.../polling_interval
 92Date:		September 2011
 93Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 94Description:
 95		The /sys/class/devfreq/.../polling_interval shows and sets
 96		the requested polling interval of the corresponding devfreq
 97		object. The values are represented in ms. If the value is
 98		less than 1 jiffy, it is considered to be 0, which means
 99		no polling. This value is meaningless if the governor is
100		not polling.
101
102		A list of governors that support the node:
103		- simple_ondmenad
104		- tegra_actmon
105
106What:		/sys/class/devfreq/.../userspace/set_freq
107Date:		September 2011
108Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
109Description:
110		The /sys/class/devfreq/.../userspace/set_freq shows and
111		sets the requested frequency for the devfreq object if
112		userspace governor is in effect.
113
114		A list of governors that support the node:
115		- userspace
116
117What:		/sys/class/devfreq/.../timer
118Date:		July 2020
119Contact:	Chanwoo Choi <cw00.choi@samsung.com>
120Description:
121		This ABI shows and stores the kind of work timer by users.
122		This work timer is used by devfreq workqueue in order to
123		monitor the device status such as utilization. The user
124		can change the work timer on runtime according to their demand
125		as following::
126
127			echo deferrable > /sys/class/devfreq/.../timer
128			echo delayed > /sys/class/devfreq/.../timer
129
130		A list of governors that support the node:
131		- simple_ondemand