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131 lines
4.6 KiB
131 lines
4.6 KiB
What: /sys/class/devfreq/.../ |
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Date: September 2011 |
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Contact: MyungJoo Ham <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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/.../trans_stat |
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Date: October 2012 |
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Contact: MyungJoo Ham <[email protected]> |
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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/.../available_frequencies |
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Date: October 2012 |
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Contact: Nishanth Menon <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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/.../polling_interval |
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Date: September 2011 |
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Contact: MyungJoo Ham <[email protected]> |
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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. |
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A list of governors that support the node: |
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- simple_ondmenad |
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- tegra_actmon |
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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 <[email protected]> |
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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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A list of governors that support the node: |
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- userspace |
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What: /sys/class/devfreq/.../timer |
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Date: July 2020 |
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Contact: Chanwoo Choi <[email protected]> |
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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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A list of governors that support the node: |
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- simple_ondemand
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