From f7290e24e3ce8a0b4b39a74800fd341b6b7a6f47 Mon Sep 17 00:00:00 2001 From: Jean Delvare <khali@linux-fr.org> Date: Wed, 9 Dec 2009 20:35:47 +0100 Subject: [PATCH] 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: Jean Delvare <khali@linux-fr.org> --- Documentation/hwmon/sysfs-interface | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface index 82def883361b1..3de6b0bcb1474 100644 --- a/Documentation/hwmon/sysfs-interface +++ b/Documentation/hwmon/sysfs-interface @@ -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 * -- GitLab