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| author | Javi Merino <javi.merino@arm.com> | 2015-03-26 15:53:02 +0000 |
|---|---|---|
| committer | Eduardo Valentin <edubezval@gmail.com> | 2015-05-04 21:27:54 -0700 |
| commit | 9f38271c6f82a577d9fdab27aaf2e1c55ae5cf73 (patch) | |
| tree | a286309ec30fc92c3422f3bf9bcd1d053ffdf4c6 /Documentation/thermal/sysfs-api.txt | |
| parent | 0cdf97e1ad8d796313de051528f06c1b16f3a679 (diff) | |
| download | lwn-9f38271c6f82a577d9fdab27aaf2e1c55ae5cf73.tar.gz lwn-9f38271c6f82a577d9fdab27aaf2e1c55ae5cf73.zip | |
thermal: export thermal_zone_parameters to sysfs
It's useful for tuning to be able to edit thermal_zone_parameters from
userspace. Export them to the thermal_zone sysfs so that they can be
easily changed.
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'Documentation/thermal/sysfs-api.txt')
| -rw-r--r-- | Documentation/thermal/sysfs-api.txt | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt index fc7dfe10778b..7d44d7f1a71b 100644 --- a/Documentation/thermal/sysfs-api.txt +++ b/Documentation/thermal/sysfs-api.txt @@ -184,6 +184,12 @@ Thermal zone device sys I/F, created once it's registered: |---trip_point_[0-*]_type: Trip point type |---trip_point_[0-*]_hyst: Hysteresis value for this trip point |---emul_temp: Emulated temperature set node + |---sustainable_power: Sustainable dissipatable power + |---k_po: Proportional term during temperature overshoot + |---k_pu: Proportional term during temperature undershoot + |---k_i: PID's integral term in the power allocator gov + |---k_d: PID's derivative term in the power allocator + |---integral_cutoff: Offset above which errors are accumulated Thermal cooling device sys I/F, created once it's registered: /sys/class/thermal/cooling_device[0-*]: @@ -307,6 +313,52 @@ emul_temp because userland can easily disable the thermal policy by simply flooding this sysfs node with low temperature values. +sustainable_power + An estimate of the sustained power that can be dissipated by + the thermal zone. Used by the power allocator governor. For + more information see Documentation/thermal/power_allocator.txt + Unit: milliwatts + RW, Optional + +k_po + The proportional term of the power allocator governor's PID + controller during temperature overshoot. Temperature overshoot + is when the current temperature is above the "desired + temperature" trip point. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +k_pu + The proportional term of the power allocator governor's PID + controller during temperature undershoot. Temperature undershoot + is when the current temperature is below the "desired + temperature" trip point. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +k_i + The integral term of the power allocator governor's PID + controller. This term allows the PID controller to compensate + for long term drift. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +k_d + The derivative term of the power allocator governor's PID + controller. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +integral_cutoff + Temperature offset from the desired temperature trip point + above which the integral term of the power allocator + governor's PID controller starts accumulating errors. For + example, if integral_cutoff is 0, then the integral term only + accumulates error when temperature is above the desired + temperature trip point. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + ***************************** * Cooling device attributes * ***************************** |