| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | |
| Olivier Deprez | 0e64123 | 2021-09-23 10:07:05 +0200 | [diff] [blame^] | 10 | What: /sys/class/devfreq/.../name |
| 11 | Date: November 2019 |
| 12 | Contact: Chanwoo Choi <cw00.choi@samsung.com> |
| 13 | Description: |
| 14 | The /sys/class/devfreq/.../name shows the name of device |
| 15 | of the corresponding devfreq object. |
| 16 | |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 17 | What: /sys/class/devfreq/.../governor |
| 18 | Date: September 2011 |
| 19 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 20 | Description: |
| 21 | The /sys/class/devfreq/.../governor show or set the name of the |
| 22 | governor used by the corresponding devfreq object. |
| 23 | |
| 24 | What: /sys/class/devfreq/.../cur_freq |
| 25 | Date: September 2011 |
| 26 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 27 | Description: |
| 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 | |
| 33 | What: /sys/class/devfreq/.../target_freq |
| 34 | Date: September 2012 |
| 35 | Contact: Rajagopal Venkat <rajagopal.venkat@linaro.org> |
| 36 | Description: |
| 37 | The /sys/class/devfreq/.../target_freq shows the next governor |
| 38 | predicted target frequency of the corresponding devfreq object. |
| 39 | |
| 40 | What: /sys/class/devfreq/.../polling_interval |
| 41 | Date: September 2011 |
| 42 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 43 | Description: |
| 44 | The /sys/class/devfreq/.../polling_interval shows and sets |
| 45 | the requested polling interval of the corresponding devfreq |
| 46 | object. The values are represented in ms. If the value is |
| 47 | less than 1 jiffy, it is considered to be 0, which means |
| 48 | no polling. This value is meaningless if the governor is |
| 49 | not polling; thus. If the governor is not using |
| 50 | devfreq-provided central polling |
| 51 | (/sys/class/devfreq/.../central_polling is 0), this value |
| 52 | may be useless. |
| 53 | |
| 54 | What: /sys/class/devfreq/.../trans_stat |
| 55 | Date: October 2012 |
| 56 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 57 | Description: |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 58 | This ABI shows the statistics of devfreq behavior on a |
| 59 | specific device. It shows the time spent in each state and |
| 60 | the number of transitions between states. |
| 61 | In order to activate this ABI, the devfreq target device |
| 62 | driver should provide the list of available frequencies |
| 63 | with its profile. |
| 64 | |
| 65 | What: /sys/class/devfreq/.../userspace/set_freq |
| 66 | Date: September 2011 |
| 67 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 68 | Description: |
| 69 | The /sys/class/devfreq/.../userspace/set_freq shows and |
| 70 | sets the requested frequency for the devfreq object if |
| 71 | userspace governor is in effect. |
| 72 | |
| 73 | What: /sys/class/devfreq/.../available_frequencies |
| 74 | Date: October 2012 |
| 75 | Contact: Nishanth Menon <nm@ti.com> |
| 76 | Description: |
| 77 | The /sys/class/devfreq/.../available_frequencies shows |
| 78 | the available frequencies of the corresponding devfreq object. |
| 79 | This is a snapshot of available frequencies and not limited |
| 80 | by the min/max frequency restrictions. |
| 81 | |
| 82 | What: /sys/class/devfreq/.../available_governors |
| 83 | Date: October 2012 |
| 84 | Contact: Nishanth Menon <nm@ti.com> |
| 85 | Description: |
| 86 | The /sys/class/devfreq/.../available_governors shows |
| 87 | currently available governors in the system. |
| 88 | |
| 89 | What: /sys/class/devfreq/.../min_freq |
| 90 | Date: January 2013 |
| 91 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 92 | Description: |
| 93 | The /sys/class/devfreq/.../min_freq shows and stores |
| 94 | the minimum frequency requested by users. It is 0 if |
| 95 | the user does not care. min_freq overrides the |
| 96 | frequency requested by governors. |
| 97 | |
| 98 | What: /sys/class/devfreq/.../max_freq |
| 99 | Date: January 2013 |
| 100 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 101 | Description: |
| 102 | The /sys/class/devfreq/.../max_freq shows and stores |
| 103 | the maximum frequency requested by users. It is 0 if |
| 104 | the user does not care. max_freq overrides the |
| 105 | frequency requested by governors and min_freq. |
| 106 | The max_freq overrides min_freq because max_freq may be |
| 107 | used to throttle devices to avoid overheating. |