| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [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 | |
| 10 | What: /sys/class/devfreq/.../governor |
| 11 | Date: September 2011 |
| 12 | Contact: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 13 | Description: |
| 14 | The /sys/class/devfreq/.../governor show or set the name of the |
| 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 |
| 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. |
| 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 | |
| 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 | |
| 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. |
| 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. |
| 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. |
| 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. |