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Date:   Thu, 11 Apr 2019 15:30:10 +0200
From:   Stefan Wahren <>
To:     Kamil Debski <>,
        Bartlomiej Zolnierkiewicz <>,
        Jean Delvare <>,
        Guenter Roeck <>,
        Rob Herring <>,
        Mark Rutland <>,
        Robin Murphy <>
        Stefan Wahren <>
Subject: [PATCH V5 2/3] Documentation: pwm-fan: Add description for RPM support

This adds a short description for the new RPM support of the pwm-fan

Signed-off-by: Stefan Wahren <>
 Documentation/hwmon/pwm-fan | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/hwmon/pwm-fan b/Documentation/hwmon/pwm-fan
index 18529d2..82fe967 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.

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