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Documentation: pwm-fan: Add description for RPM support

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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>
This commit is contained in:
Stefan Wahren
2019-04-15 17:19:53 -07:00
committed by Guenter Roeck
parent c7366e9514
commit 285d7483aa
1 changed files with 3 additions and 0 deletions
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Documentation/hwmon/pwm-fan
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@@ -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.