1What: /sys/class/devfreq/.../ 2Date: September 2011 3Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 4Description: 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 10What: /sys/class/devfreq/.../name 11Date: November 2019 12Contact: Chanwoo Choi <cw00.choi@samsung.com> 13Description: 14 The /sys/class/devfreq/.../name shows the name of device 15 of the corresponding devfreq object. 16 17What: /sys/class/devfreq/.../governor 18Date: September 2011 19Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 20Description: 21 The /sys/class/devfreq/.../governor show or set the name of the 22 governor used by the corresponding devfreq object. 23 24What: /sys/class/devfreq/.../cur_freq 25Date: September 2011 26Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 27Description: 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 33What: /sys/class/devfreq/.../target_freq 34Date: September 2012 35Contact: Rajagopal Venkat <rajagopal.venkat@linaro.org> 36Description: 37 The /sys/class/devfreq/.../target_freq shows the next governor 38 predicted target frequency of the corresponding devfreq object. 39 40What: /sys/class/devfreq/.../polling_interval 41Date: September 2011 42Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 43Description: 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 54What: /sys/class/devfreq/.../trans_stat 55Date: October 2012 56Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 57Description: 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 65What: /sys/class/devfreq/.../userspace/set_freq 66Date: September 2011 67Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 68Description: 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 73What: /sys/class/devfreq/.../available_frequencies 74Date: October 2012 75Contact: Nishanth Menon <nm@ti.com> 76Description: 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 82What: /sys/class/devfreq/.../available_governors 83Date: October 2012 84Contact: Nishanth Menon <nm@ti.com> 85Description: 86 The /sys/class/devfreq/.../available_governors shows 87 currently available governors in the system. 88 89What: /sys/class/devfreq/.../min_freq 90Date: January 2013 91Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 92Description: 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 98What: /sys/class/devfreq/.../max_freq 99Date: January 2013 100Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 101Description: 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. 108