Commit f7290e24 authored by Jean Delvare's avatar Jean Delvare
Browse files

hwmon: Clarify autopwm trip points documentation



Document the case of hybrid automatic fan speed control
implementations, where trip points are associated to both PWM output
channels and temperature input channels.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 047f4ec2
......@@ -225,8 +225,6 @@ pwm[1-*]_auto_point[1-*]_temp_hyst
to PWM output channels.
RW
OR
temp[1-*]_auto_point[1-*]_pwm
temp[1-*]_auto_point[1-*]_temp
temp[1-*]_auto_point[1-*]_temp_hyst
......@@ -235,6 +233,15 @@ temp[1-*]_auto_point[1-*]_temp_hyst
to temperature channels.
RW
There is a third case where trip points are associated to both PWM output
channels and temperature channels: the PWM values are associated to PWM
output channels while the temperature values are associated to temperature
channels. In that case, the result is determined by the mapping between
temperature inputs and PWM outputs. When several temperature inputs are
mapped to a given PWM output, this leads to several candidate PWM values.
The actual result is up to the chip, but in general the highest candidate
value (fastest fan speed) wins.
****************
* Temperatures *
......
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