diff options
| author | Ronan Dalton <ronan.dalton@alliedtelesis.co.nz> | 2026-05-14 12:34:04 +1200 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2026-06-09 08:23:00 -0700 |
| commit | 1000878867bdf36b768802128f51379a1d8593e6 (patch) | |
| tree | 76facc84c570c701379a68c1d37c528dba80ccff /Documentation/hwmon | |
| parent | 4a9e6a9230c88a71916301b9fe6627413ebc2574 (diff) | |
| download | linux-next-1000878867bdf36b768802128f51379a1d8593e6.tar.gz linux-next-1000878867bdf36b768802128f51379a1d8593e6.zip | |
hwmon: (nct7802) Add time step attributes for tweaking responsiveness
The nct7802 chip exposes two registers that allow setting the time
interval between successive duty increases or decreases in Smart Fan
mode. The units are intervals of 0.1 second. The default value at power
on is 10, so 1 second.
Add sysfs attributes for step_up_time and step_down_time to allow
controlling the responsiveness of the fan speed. Values are represented
as milliseconds to the user. When set, the value is clamped to the valid
range of 100 to 25500 (0.1 to 25.5 seconds), and rounded to the nearest
multiple of 100.
Signed-off-by: Ronan Dalton <ronan.dalton@alliedtelesis.co.nz>
Cc: linux-kernel@vger.kernel.org
Cc: linux-hwmon@vger.kernel.org
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20260514003404.1548747-2-ronan.dalton@alliedtelesis.co.nz
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/nct7802.rst | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/hwmon/nct7802.rst b/Documentation/hwmon/nct7802.rst index 8b7365a7cb32..366050ea595c 100644 --- a/Documentation/hwmon/nct7802.rst +++ b/Documentation/hwmon/nct7802.rst @@ -24,6 +24,22 @@ speed sensors. Smart Fan™ speed control is available via pwmX_auto_point attributes. +Sysfs Attributes +---------------- + +Sysfs attributes unique to this chip are documented below. For common +attributes, see Documentation/hwmon/sysfs-interface.rst. + +step_up_time + Time interval between successive duty cycle increases + when in Smart Fan mode. Specified in milliseconds and + rounded to intervals of 100 in the range 100-25500. + +step_down_time + Time interval between successive duty cycle decreases + when in Smart Fan mode. Specified in milliseconds and + rounded to intervals of 100 in the range 100-25500. + Tested Boards and BIOS Versions ------------------------------- |