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Commit 285d7483 authored by Stefan Wahren's avatar Stefan Wahren Committed by Guenter Roeck
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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: default avatarStefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent c7366e95

Documentation/hwmon/pwm-fan

+3 −0
Original line number Diff line number Diff line
@@ -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.