1 What: /sys/class/devfreq/.../ 1 What: /sys/class/devfreq/.../
2 Date: September 2011 2 Date: September 2011
3 Contact: MyungJoo Ham <myungjoo.ham@sams 3 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
4 Description: 4 Description:
5 Provide a place in sysfs for t 5 Provide a place in sysfs for the devfreq objects.
6 This allows accessing various 6 This allows accessing various devfreq specific variables.
7 The name of devfreq object den 7 The name of devfreq object denoted as ... is same as the
8 name of device using devfreq. 8 name of device using devfreq.
9 9
10 What: /sys/class/devfreq/.../name <<
11 Date: November 2019 <<
12 Contact: Chanwoo Choi <cw00.choi@samsung <<
13 Description: <<
14 The /sys/class/devfreq/.../nam <<
15 of the corresponding devfreq o <<
16 <<
17 What: /sys/class/devfreq/.../governo 10 What: /sys/class/devfreq/.../governor
18 Date: September 2011 11 Date: September 2011
19 Contact: MyungJoo Ham <myungjoo.ham@sams 12 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
20 Description: 13 Description:
21 The /sys/class/devfreq/.../gov 14 The /sys/class/devfreq/.../governor show or set the name of the
22 governor used by the correspon 15 governor used by the corresponding devfreq object.
23 16
24 What: /sys/class/devfreq/.../cur_fre 17 What: /sys/class/devfreq/.../cur_freq
25 Date: September 2011 18 Date: September 2011
26 Contact: MyungJoo Ham <myungjoo.ham@sams 19 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
27 Description: 20 Description:
28 The /sys/class/devfreq/.../cur 21 The /sys/class/devfreq/.../cur_freq shows the current
29 frequency of the corresponding 22 frequency of the corresponding devfreq object. Same as
30 target_freq when get_cur_freq( 23 target_freq when get_cur_freq() is not implemented by
31 devfreq driver. 24 devfreq driver.
32 25
33 What: /sys/class/devfreq/.../target_ 26 What: /sys/class/devfreq/.../target_freq
34 Date: September 2012 27 Date: September 2012
35 Contact: Rajagopal Venkat <rajagopal.ven 28 Contact: Rajagopal Venkat <rajagopal.venkat@linaro.org>
36 Description: 29 Description:
37 The /sys/class/devfreq/.../tar 30 The /sys/class/devfreq/.../target_freq shows the next governor
38 predicted target frequency of 31 predicted target frequency of the corresponding devfreq object.
39 32
>> 33 What: /sys/class/devfreq/.../polling_interval
>> 34 Date: September 2011
>> 35 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
>> 36 Description:
>> 37 The /sys/class/devfreq/.../polling_interval shows and sets
>> 38 the requested polling interval of the corresponding devfreq
>> 39 object. The values are represented in ms. If the value is
>> 40 less than 1 jiffy, it is considered to be 0, which means
>> 41 no polling. This value is meaningless if the governor is
>> 42 not polling; thus. If the governor is not using
>> 43 devfreq-provided central polling
>> 44 (/sys/class/devfreq/.../central_polling is 0), this value
>> 45 may be useless.
>> 46
40 What: /sys/class/devfreq/.../trans_s 47 What: /sys/class/devfreq/.../trans_stat
41 Date: October 2012 48 Date: October 2012
42 Contact: MyungJoo Ham <myungjoo.ham@sams 49 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
43 Description: !! 50 Descrtiption:
44 This ABI shows or clears the s !! 51 This ABI shows the statistics of devfreq behavior on a
45 on a specific device. It shows !! 52 specific device. It shows the time spent in each state and
46 and the number of transitions !! 53 the number of transitions between states.
47 In order to activate this ABI, 54 In order to activate this ABI, the devfreq target device
48 driver should provide the list 55 driver should provide the list of available frequencies
49 with its profile. If need to r !! 56 with its profile.
50 behavior on a specific device, <<
51 as following:: <<
52 <<
53 echo 0 > /sys/class/de <<
54 57
55 If the transition table is big !! 58 What: /sys/class/devfreq/.../userspace/set_freq
56 this will return an -EFBIG err !! 59 Date: September 2011
>> 60 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
>> 61 Description:
>> 62 The /sys/class/devfreq/.../userspace/set_freq shows and
>> 63 sets the requested frequency for the devfreq object if
>> 64 userspace governor is in effect.
57 65
58 What: /sys/class/devfreq/.../availab 66 What: /sys/class/devfreq/.../available_frequencies
59 Date: October 2012 67 Date: October 2012
60 Contact: Nishanth Menon <nm@ti.com> 68 Contact: Nishanth Menon <nm@ti.com>
61 Description: 69 Description:
62 The /sys/class/devfreq/.../ava 70 The /sys/class/devfreq/.../available_frequencies shows
63 the available frequencies of t 71 the available frequencies of the corresponding devfreq object.
64 This is a snapshot of availabl 72 This is a snapshot of available frequencies and not limited
65 by the min/max frequency restr 73 by the min/max frequency restrictions.
66 74
67 What: /sys/class/devfreq/.../availab 75 What: /sys/class/devfreq/.../available_governors
68 Date: October 2012 76 Date: October 2012
69 Contact: Nishanth Menon <nm@ti.com> 77 Contact: Nishanth Menon <nm@ti.com>
70 Description: 78 Description:
71 The /sys/class/devfreq/.../ava 79 The /sys/class/devfreq/.../available_governors shows
72 currently available governors 80 currently available governors in the system.
73 81
74 What: /sys/class/devfreq/.../min_fre 82 What: /sys/class/devfreq/.../min_freq
75 Date: January 2013 83 Date: January 2013
76 Contact: MyungJoo Ham <myungjoo.ham@sams 84 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
77 Description: 85 Description:
78 The /sys/class/devfreq/.../min 86 The /sys/class/devfreq/.../min_freq shows and stores
79 the minimum frequency requeste 87 the minimum frequency requested by users. It is 0 if
80 the user does not care. min_fr 88 the user does not care. min_freq overrides the
81 frequency requested by governo 89 frequency requested by governors.
82 90
83 What: /sys/class/devfreq/.../max_fre 91 What: /sys/class/devfreq/.../max_freq
84 Date: January 2013 92 Date: January 2013
85 Contact: MyungJoo Ham <myungjoo.ham@sams 93 Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
86 Description: 94 Description:
87 The /sys/class/devfreq/.../max 95 The /sys/class/devfreq/.../max_freq shows and stores
88 the maximum frequency requeste 96 the maximum frequency requested by users. It is 0 if
89 the user does not care. max_fr 97 the user does not care. max_freq overrides the
90 frequency requested by governo 98 frequency requested by governors and min_freq.
91 The max_freq overrides min_fre 99 The max_freq overrides min_freq because max_freq may be
92 used to throttle devices to av 100 used to throttle devices to avoid overheating.
93 <<
94 What: /sys/class/devfreq/.../polling <<
95 Date: September 2011 <<
96 Contact: MyungJoo Ham <myungjoo.ham@sams <<
97 Description: <<
98 The /sys/class/devfreq/.../pol <<
99 the requested polling interval <<
100 object. The values are represe <<
101 less than 1 jiffy, it is consi <<
102 no polling. This value is mean <<
103 not polling. <<
104 <<
105 A list of governors that suppo <<
106 - simple_ondmenad <<
107 - tegra_actmon <<
108 <<
109 What: /sys/class/devfreq/.../userspa <<
110 Date: September 2011 <<
111 Contact: MyungJoo Ham <myungjoo.ham@sams <<
112 Description: <<
113 The /sys/class/devfreq/.../use <<
114 sets the requested frequency f <<
115 userspace governor is in effec <<
116 <<
117 A list of governors that suppo <<
118 - userspace <<
119 <<
120 What: /sys/class/devfreq/.../timer <<
121 Date: July 2020 <<
122 Contact: Chanwoo Choi <cw00.choi@samsung <<
123 Description: <<
124 This ABI shows and stores the <<
125 This work timer is used by dev <<
126 monitor the device status such <<
127 can change the work timer on r <<
128 as following:: <<
129 <<
130 echo deferrable > /sys <<
131 echo delayed > /sys/cl <<
132 <<
133 A list of governors that suppo <<
134 - simple_ondemand <<
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