From 285d7483aa3323c90891e26b73a0c9d9cc5f53e4 Mon Sep 17 00:00:00 2001 From: Stefan Wahren Date: Thu, 11 Apr 2019 15:30:10 +0200 Subject: 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 Reviewed-by: Robin Murphy Signed-off-by: Guenter Roeck --- Documentation/hwmon/pwm-fan | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation/hwmon') 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. -- cgit v1.2.3-55-g7522