What: /sys/class/devfreq/.../
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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Provide a place in sysfs for the devfreq objects.
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This allows accessing various devfreq specific variables.
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The name of devfreq object denoted as ... is same as the
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name of device using devfreq.
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What: /sys/class/devfreq/.../name
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Date: November 2019
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Contact: Chanwoo Choi <cw00.choi@samsung.com>
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Description:
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The /sys/class/devfreq/.../name shows the name of device
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of the corresponding devfreq object.
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What: /sys/class/devfreq/.../governor
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../governor show or set the name of the
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governor used by the corresponding devfreq object.
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What: /sys/class/devfreq/.../cur_freq
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../cur_freq shows the current
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frequency of the corresponding devfreq object. Same as
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target_freq when get_cur_freq() is not implemented by
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devfreq driver.
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What: /sys/class/devfreq/.../target_freq
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Date: September 2012
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Contact: Rajagopal Venkat <rajagopal.venkat@linaro.org>
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Description:
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The /sys/class/devfreq/.../target_freq shows the next governor
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predicted target frequency of the corresponding devfreq object.
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What: /sys/class/devfreq/.../polling_interval
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../polling_interval shows and sets
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the requested polling interval of the corresponding devfreq
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object. The values are represented in ms. If the value is
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less than 1 jiffy, it is considered to be 0, which means
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no polling. This value is meaningless if the governor is
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not polling; thus. If the governor is not using
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devfreq-provided central polling
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(/sys/class/devfreq/.../central_polling is 0), this value
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may be useless.
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What: /sys/class/devfreq/.../trans_stat
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Date: October 2012
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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This ABI shows or clears the statistics of devfreq behavior
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on a specific device. It shows the time spent in each state
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and the number of transitions between states.
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In order to activate this ABI, the devfreq target device
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driver should provide the list of available frequencies
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with its profile. If need to reset the statistics of devfreq
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behavior on a specific device, enter 0(zero) to 'trans_stat'
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as following::
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echo 0 > /sys/class/devfreq/.../trans_stat
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What: /sys/class/devfreq/.../userspace/set_freq
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../userspace/set_freq shows and
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sets the requested frequency for the devfreq object if
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userspace governor is in effect.
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What: /sys/class/devfreq/.../available_frequencies
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Date: October 2012
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Contact: Nishanth Menon <nm@ti.com>
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Description:
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The /sys/class/devfreq/.../available_frequencies shows
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the available frequencies of the corresponding devfreq object.
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This is a snapshot of available frequencies and not limited
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by the min/max frequency restrictions.
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What: /sys/class/devfreq/.../available_governors
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Date: October 2012
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Contact: Nishanth Menon <nm@ti.com>
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Description:
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The /sys/class/devfreq/.../available_governors shows
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currently available governors in the system.
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What: /sys/class/devfreq/.../min_freq
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Date: January 2013
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../min_freq shows and stores
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the minimum frequency requested by users. It is 0 if
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the user does not care. min_freq overrides the
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frequency requested by governors.
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What: /sys/class/devfreq/.../max_freq
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Date: January 2013
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../max_freq shows and stores
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the maximum frequency requested by users. It is 0 if
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the user does not care. max_freq overrides the
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frequency requested by governors and min_freq.
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The max_freq overrides min_freq because max_freq may be
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used to throttle devices to avoid overheating.
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What: /sys/class/devfreq/.../timer
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Date: July 2020
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Contact: Chanwoo Choi <cw00.choi@samsung.com>
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Description:
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This ABI shows and stores the kind of work timer by users.
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This work timer is used by devfreq workqueue in order to
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monitor the device status such as utilization. The user
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can change the work timer on runtime according to their demand
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as following::
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echo deferrable > /sys/class/devfreq/.../timer
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echo delayed > /sys/class/devfreq/.../timer
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