1 What: /sys/class/devfreq/.../
3 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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.
10 What: /sys/class/devfreq/.../name
12 Contact: Chanwoo Choi <cw00.choi@samsung.com>
14 The /sys/class/devfreq/.../name shows the name of device
15 of the corresponding devfreq object.
17 What: /sys/class/devfreq/.../governor
19 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
21 The /sys/class/devfreq/.../governor show or set the name of the
22 governor used by the corresponding devfreq object.
24 What: /sys/class/devfreq/.../cur_freq
26 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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
33 What: /sys/class/devfreq/.../target_freq
35 Contact: Rajagopal Venkat <rajagopal.venkat@linaro.org>
37 The /sys/class/devfreq/.../target_freq shows the next governor
38 predicted target frequency of the corresponding devfreq object.
40 What: /sys/class/devfreq/.../trans_stat
42 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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'
53 echo 0 > /sys/class/devfreq/.../trans_stat
55 What: /sys/class/devfreq/.../available_frequencies
57 Contact: Nishanth Menon <nm@ti.com>
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.
64 What: /sys/class/devfreq/.../available_governors
66 Contact: Nishanth Menon <nm@ti.com>
68 The /sys/class/devfreq/.../available_governors shows
69 currently available governors in the system.
71 What: /sys/class/devfreq/.../min_freq
73 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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.
80 What: /sys/class/devfreq/.../max_freq
82 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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.
91 What: /sys/class/devfreq/.../polling_interval
93 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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
102 A list of governors that support the node:
106 What: /sys/class/devfreq/.../userspace/set_freq
108 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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.
114 A list of governors that support the node:
117 What: /sys/class/devfreq/.../timer
119 Contact: Chanwoo Choi <cw00.choi@samsung.com>
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
127 echo deferrable > /sys/class/devfreq/.../timer
128 echo delayed > /sys/class/devfreq/.../timer
130 A list of governors that support the node: