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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

Documentation/hwmon/sysfs-interface

+9 −2
Original line number Diff line number Diff line
@@ -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 *