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| author | Stefan Wahren <stefan.wahren@i2se.com> | 2019-04-11 15:30:10 +0200 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2019-04-16 02:19:53 +0200 |
| commit | 285d7483aa3323c90891e26b73a0c9d9cc5f53e4 (patch) | |
| tree | 95540fd2c8b2cc77f296ff3e021f8767f31a5146 /Documentation/hwmon | |
| parent | dt-bindings: hwmon: (pwm-fan) Add tachometer interrupt (diff) | |
| download | linux-285d7483aa3323c90891e26b73a0c9d9cc5f53e4.tar.xz linux-285d7483aa3323c90891e26b73a0c9d9cc5f53e4.zip | |
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-fan | 3 |
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. |