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authorJean Delvare <khali@linux-fr.org>2009-12-09 20:35:47 +0100
committerJean Delvare <khali@linux-fr.org>2009-12-09 20:35:47 +0100
commitf7290e24e3ce8a0b4b39a74800fd341b6b7a6f47 (patch)
tree985b1e927f88dfee98af6463852fd936f3335af9 /Documentation
parent047f4ec29453ad8a785ccab7d8098f28149828e2 (diff)
downloadlinux-stericsson-f7290e24e3ce8a0b4b39a74800fd341b6b7a6f47.tar.gz
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/sysfs-interface11
1 files changed, 9 insertions, 2 deletions
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index 82def883361b..3de6b0bcb147 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 *