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/.../trans_stat 41Date: October 2012 42Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 43Description: 44 This ABI shows or clears the statistics of devfreq behavior 45 on a specific device. It shows the time spent in each state 46 and the number of transitions between states. 47 In order to activate this ABI, the devfreq target device 48 driver should provide the list of available frequencies 49 with its profile. If need to reset the statistics of devfreq 50 behavior on a specific device, enter 0(zero) to 'trans_stat' 51 as following: 52 echo 0 > /sys/class/devfreq/.../trans_stat 53 54What: /sys/class/devfreq/.../available_frequencies 55Date: October 2012 56Contact: Nishanth Menon <nm@ti.com> 57Description: 58 The /sys/class/devfreq/.../available_frequencies shows 59 the available frequencies of the corresponding devfreq object. 60 This is a snapshot of available frequencies and not limited 61 by the min/max frequency restrictions. 62 63What: /sys/class/devfreq/.../available_governors 64Date: October 2012 65Contact: Nishanth Menon <nm@ti.com> 66Description: 67 The /sys/class/devfreq/.../available_governors shows 68 currently available governors in the system. 69 70What: /sys/class/devfreq/.../min_freq 71Date: January 2013 72Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 73Description: 74 The /sys/class/devfreq/.../min_freq shows and stores 75 the minimum frequency requested by users. It is 0 if 76 the user does not care. min_freq overrides the 77 frequency requested by governors. 78 79What: /sys/class/devfreq/.../max_freq 80Date: January 2013 81Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 82Description: 83 The /sys/class/devfreq/.../max_freq shows and stores 84 the maximum frequency requested by users. It is 0 if 85 the user does not care. max_freq overrides the 86 frequency requested by governors and min_freq. 87 The max_freq overrides min_freq because max_freq may be 88 used to throttle devices to avoid overheating. 89 90What: /sys/class/devfreq/.../polling_interval 91Date: September 2011 92Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 93Description: 94 The /sys/class/devfreq/.../polling_interval shows and sets 95 the requested polling interval of the corresponding devfreq 96 object. The values are represented in ms. If the value is 97 less than 1 jiffy, it is considered to be 0, which means 98 no polling. This value is meaningless if the governor is 99 not polling; thus. If the governor is not using 100 devfreq-provided central polling 101 (/sys/class/devfreq/.../central_polling is 0), this value 102 may be useless. 103 104 A list of governors that support the node: 105 - simple_ondmenad 106 - tegra_actmon 107 108What: /sys/class/devfreq/.../userspace/set_freq 109Date: September 2011 110Contact: MyungJoo Ham <myungjoo.ham@samsung.com> 111Description: 112 The /sys/class/devfreq/.../userspace/set_freq shows and 113 sets the requested frequency for the devfreq object if 114 userspace governor is in effect. 115 116 A list of governors that support the node: 117 - userspace 118 119What: /sys/class/devfreq/.../timer 120Date: July 2020 121Contact: Chanwoo Choi <cw00.choi@samsung.com> 122Description: 123 This ABI shows and stores the kind of work timer by users. 124 This work timer is used by devfreq workqueue in order to 125 monitor the device status such as utilization. The user 126 can change the work timer on runtime according to their demand 127 as following: 128 echo deferrable > /sys/class/devfreq/.../timer 129 echo delayed > /sys/class/devfreq/.../timer 130 131 A list of governors that support the node: 132 - simple_ondemand 133