05f15314f0
First of all, no_central_polling was removed since
commit 7e6fdd4bad ("PM / devfreq: Core updates to support devices
which can idle")
Secondly, get_target_freq() is not only called only with update_devfreq()
notified by OPP now, but also min/max freq qos notifier.
So remove this invalid description now to avoid confusing.
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
132 lines
4.6 KiB
Plaintext
132 lines
4.6 KiB
Plaintext
What: /sys/class/devfreq/.../
|
|
Date: September 2011
|
|
Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
|
|
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 <cw00.choi@samsung.com>
|
|
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 <myungjoo.ham@samsung.com>
|
|
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 <myungjoo.ham@samsung.com>
|
|
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 <rajagopal.venkat@linaro.org>
|
|
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 <myungjoo.ham@samsung.com>
|
|
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 <nm@ti.com>
|
|
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 <nm@ti.com>
|
|
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 <myungjoo.ham@samsung.com>
|
|
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 <myungjoo.ham@samsung.com>
|
|
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 <myungjoo.ham@samsung.com>
|
|
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 <myungjoo.ham@samsung.com>
|
|
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 <cw00.choi@samsung.com>
|
|
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
|