From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7CA1C4360F for ; Mon, 25 Feb 2019 16:00:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ACAC820842 for ; Mon, 25 Feb 2019 16:00:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727844AbfBYQAa (ORCPT ); Mon, 25 Feb 2019 11:00:30 -0500 Received: from mout.kundenserver.de ([212.227.126.135]:51621 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727659AbfBYQAa (ORCPT ); Mon, 25 Feb 2019 11:00:30 -0500 Received: from stefan-Vostro-260.fritz.box ([109.104.53.79]) by mrelayeu.kundenserver.de (mreue010 [212.227.15.167]) with ESMTPSA (Nemesis) id 1Mzi3l-1hBxnh38z3-00vieL; Mon, 25 Feb 2019 16:59:56 +0100 From: Stefan Wahren To: Kamil Debski , Bartlomiej Zolnierkiewicz , Jean Delvare , Guenter Roeck , Rob Herring , Mark Rutland Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Wahren Subject: [PATCH RFC V2 2/3] Documentation: pwm-fan: Add description for RPM support Date: Mon, 25 Feb 2019 16:59:18 +0100 Message-Id: <1551110359-19860-3-git-send-email-stefan.wahren@i2se.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551110359-19860-1-git-send-email-stefan.wahren@i2se.com> References: <1551110359-19860-1-git-send-email-stefan.wahren@i2se.com> X-Provags-ID: V03:K1:rDt8rM8KQB7JFkh3ue3qtgnNVwqdhgTVjkuzq7YJjfKcx4G3RLQ ZAOY6VuACZp32WN3rZ76TCxfMuEueg/h4gOamV6qi97+sWRAa3MEGLeIpzIg0Ox3X8H4AGB K7TXTDMVcUH9xuDejYbE7qBMRd+Ng66UKhhpiDDNoI5vIDCVmW5JxgvyNJxDDkcU7WEuVVa gw1k+JKQDD494X0dzxJxg== X-UI-Out-Filterresults: notjunk:1;V03:K0:YcnrOrRgbC4=:bKedZtA2+xcuV9deovjPhf o+C2kfVozulnUkG7GtEPbXm6erhPX1zyFPUqahEO7IKz7rgTK7U4p8gdcaPSIT/OZopMK6UWj dhamxS2Iip7xvuJ/ulNYVDifvfUezgP4RX+ovv65d/2nX1ghjaTwuUSkZnXrtYogoocDoRkuS TsexyT0XGPJN9UmICwIxnM8j6DBwx2IEtQoir78NSnx8ioKNv4W6VDe0IbZ7wnyyV+xqXUa1e MKvjyAz0lkUsO3Lf8XTbC2nvcsMIuJA5spEajA9NzubVzXZiq+Dfm7yLObOp+SP90ue7SO8gY RYaXxGvOT8zLXgH4AeMkjtCY8ND8XLoOv2mGfHD0FihIv6n3Faan228vC5dsHE7SPZRSIazUl 5COllol5FZ6y2pL7S92bmhvIDWewBxEqVdHSs6gPKMQD6h1/UcoYM16/tXW0hfirKA5sQNIyk QgU9Fo5ZLVEfUXVOb/kbWQ0OC2yq1Ui0VBCnrIjaAVZ6rPvUoRU0iAV5pCijEp5Trq2eTNTKT NNS42Dc3PLTehnn2Znat+BsHqJ/GUdIUFaGQBCzf6m0vj2XzdlZEVVWVUGMqwY0nWgrjNcXpi BNcGpVOzLHKfNsqrACzT++C0ec4zTbUMHqTLfI59rJUCQsO4rIptdUMNIobdppKZqFORJl9dT fv8GQjdR0MvdfeCTueq9ICJf2CvhHG+2+gB9cGlCe5nA19Tt64+uqBC9kRCCaciXbzDXTEcDL rinKUfqN+g80bRfcmZo+34Wv1BaktXJip+jTavqemJ7Nr5gO4sPhh2CuiLU= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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