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-rw-r--r--Documentation/hwmon/sysfs-interface11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index c6559f153589..83a698773ade 100644
--- a/Documentation/hwmon/sysfs-interface
+++ b/Documentation/hwmon/sysfs-interface
@@ -187,6 +187,17 @@ fan[1-*]_div Fan divisor.
Note that this is actually an internal clock divisor, which
affects the measurable speed range, not the read value.
+fan[1-*]_pulses Number of tachometer pulses per fan revolution.
+ Integer value, typically between 1 and 4.
+ RW
+ This value is a characteristic of the fan connected to the
+ device's input, so it has to be set in accordance with the fan
+ model.
+ Should only be created if the chip has a register to configure
+ the number of pulses. In the absence of such a register (and
+ thus attribute) the value assumed by all devices is 2 pulses
+ per fan revolution.
+
fan[1-*]_target
Desired fan speed
Unit: revolution/min (RPM)