From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Wahren Subject: [PATCH V3 2/3] Documentation: pwm-fan: Add description for RPM support Date: Fri, 22 Mar 2019 09:24:02 +0100 Message-ID: <1553243043-19486-3-git-send-email-stefan.wahren@i2se.com> References: <1553243043-19486-1-git-send-email-stefan.wahren@i2se.com> Return-path: In-Reply-To: <1553243043-19486-1-git-send-email-stefan.wahren@i2se.com> Sender: linux-kernel-owner@vger.kernel.org To: Kamil Debski , Bartlomiej Zolnierkiewicz , Jean Delvare , Guenter Roeck , Rob Herring , Mark Rutland , Robin Murphy Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Wahren List-Id: devicetree@vger.kernel.org This adds a short description for the new RPM support of the pwm-fan driver. 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. -- 2.7.4