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authorStefan Wahren <stefan.wahren@i2se.com>2019-04-11 15:30:10 +0200
committerGuenter Roeck <linux@roeck-us.net>2019-04-15 17:19:53 -0700
commit285d7483aa3323c90891e26b73a0c9d9cc5f53e4 (patch)
tree95540fd2c8b2cc77f296ff3e021f8767f31a5146 /Documentation/hwmon
parentc7366e951469b542fa16ca94ac6d09ac2206d11a (diff)
Documentation: pwm-fan: Add description for RPM support
This adds a short description for the new RPM support of the pwm-fan driver. Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r--Documentation/hwmon/pwm-fan3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/hwmon/pwm-fan b/Documentation/hwmon/pwm-fan
index 18529d2e3bcf..82fe96742fee 100644
--- a/Documentation/hwmon/pwm-fan
+++ b/Documentation/hwmon/pwm-fan
@@ -15,3 +15,6 @@ The driver implements a simple interface for driving a fan connected to
a PWM output. It uses the generic PWM interface, thus it can be used with
a range of SoCs. The driver exposes the fan to the user space through
the hwmon's sysfs interface.
+
+The fan rotation speed returned via the optional 'fan1_input' is extrapolated
+from the sampled interrupts from the tachometer signal within 1 second.