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