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Commit | Line | Data |
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9005b650 MH |
1 | What: /sys/class/devfreq/.../ |
2 | Date: September 2011 | |
3 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> | |
4 | Description: | |
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 | ||
10 | What: /sys/class/devfreq/.../governor | |
11 | Date: September 2011 | |
12 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> | |
13 | Description: | |
0359d1af | 14 | The /sys/class/devfreq/.../governor show or set the name of the |
9005b650 MH |
15 | governor used by the corresponding devfreq object. |
16 | ||
17 | What: /sys/class/devfreq/.../cur_freq | |
18 | Date: September 2011 | |
19 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> | |
20 | Description: | |
21 | The /sys/class/devfreq/.../cur_freq shows the current | |
7f98a905 RV |
22 | frequency of the corresponding devfreq object. Same as |
23 | target_freq when get_cur_freq() is not implemented by | |
24 | devfreq driver. | |
25 | ||
26 | What: /sys/class/devfreq/.../target_freq | |
27 | Date: September 2012 | |
28 | Contact: Rajagopal Venkat <rajagopal.venkat@linaro.org> | |
29 | Description: | |
30 | The /sys/class/devfreq/.../target_freq shows the next governor | |
31 | predicted target frequency of the corresponding devfreq object. | |
9005b650 | 32 | |
9005b650 MH |
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. | |
ce26c5bb | 46 | |
e552bbaf JL |
47 | What: /sys/class/devfreq/.../trans_stat |
48 | Date: October 2012 | |
49 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> | |
50 | Descrtiption: | |
51 | This ABI shows the statistics of devfreq behavior on a | |
52 | specific device. It shows the time spent in each state and | |
53 | the number of transitions between states. | |
54 | In order to activate this ABI, the devfreq target device | |
55 | driver should provide the list of available frequencies | |
56 | with its profile. | |
57 | ||
ce26c5bb MH |
58 | What: /sys/class/devfreq/.../userspace/set_freq |
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. | |
d287de85 NM |
65 | |
66 | What: /sys/class/devfreq/.../available_frequencies | |
67 | Date: October 2012 | |
68 | Contact: Nishanth Menon <nm@ti.com> | |
69 | Description: | |
70 | The /sys/class/devfreq/.../available_frequencies shows | |
71 | the available frequencies of the corresponding devfreq object. | |
72 | This is a snapshot of available frequencies and not limited | |
73 | by the min/max frequency restrictions. | |
50a5b33e NM |
74 | |
75 | What: /sys/class/devfreq/.../available_governors | |
76 | Date: October 2012 | |
77 | Contact: Nishanth Menon <nm@ti.com> | |
78 | Description: | |
79 | The /sys/class/devfreq/.../available_governors shows | |
80 | currently available governors in the system. | |
de9c7394 MH |
81 | |
82 | What: /sys/class/devfreq/.../min_freq | |
83 | Date: January 2013 | |
84 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> | |
85 | Description: | |
86 | The /sys/class/devfreq/.../min_freq shows and stores | |
87 | the minimum frequency requested by users. It is 0 if | |
88 | the user does not care. min_freq overrides the | |
89 | frequency requested by governors. | |
90 | ||
91 | What: /sys/class/devfreq/.../max_freq | |
92 | Date: January 2013 | |
93 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> | |
94 | Description: | |
95 | The /sys/class/devfreq/.../max_freq shows and stores | |
96 | the maximum frequency requested by users. It is 0 if | |
97 | the user does not care. max_freq overrides the | |
98 | frequency requested by governors and min_freq. | |
99 | The max_freq overrides min_freq because max_freq may be | |
100 | used to throttle devices to avoid overheating. |