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,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 DB141C4360F for ; Tue, 2 Apr 2019 14:23:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A68152084B for ; Tue, 2 Apr 2019 14:23:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731569AbfDBOXF (ORCPT ); Tue, 2 Apr 2019 10:23:05 -0400 Received: from mout.kundenserver.de ([217.72.192.75]:53911 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730527AbfDBOXE (ORCPT ); Tue, 2 Apr 2019 10:23:04 -0400 Received: from stefan-Vostro-260.fritz.box ([109.104.50.84]) by mrelayeu.kundenserver.de (mreue107 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MUXd0-1hK1Uw3S8O-00QP7r; Tue, 02 Apr 2019 16:22:10 +0200 From: Stefan Wahren 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 Subject: [PATCH V4 2/3] Documentation: pwm-fan: Add description for RPM support Date: Tue, 2 Apr 2019 16:21:49 +0200 Message-Id: <1554214910-29925-3-git-send-email-stefan.wahren@i2se.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1554214910-29925-1-git-send-email-stefan.wahren@i2se.com> References: <1554214910-29925-1-git-send-email-stefan.wahren@i2se.com> X-Provags-ID: V03:K1:sW79vU0wqdEQ18pGVxWJjoGC9YpoDTcqaW1ETqYXlKp3U1zGahB HxgNcz9aH5EDwV70pNcg7vFo+BAgpO2MJerJdAzUSV2k+OD3Pd5WkwYir0P/oumrS6cMOvm LQUD8hHpslqSfVVlbDgNznumPL8wCJitqor1Yj9OeZycotwEFbmmh2eJ+HSSWBnL4mNCRQU dDFmTHFZCiUzofUeHNZhg== X-UI-Out-Filterresults: notjunk:1;V03:K0:jEJ+CZrIMRo=:Cj2whXIIO5n7sfq+ZiaUDb Qd9mg8G+3DQWmg9yfEeN7VpX23kqJ4uIBD4FGUMFY6q2+D8Kqe3zb3vgmGKTdWA+NI1SD+mFJ Kn/qrTRUBjaKfoG5rJPq6ykWVymTX6RRFWt25lMqy7fH3T6YuRroRbPYupSjpc95bcWOW2LP/ aSKwyUAcEZvFBKVmlDD/q64Ikr9rHxofyp6kiQmo47BU1I9o58NnYe4piWkbuXB4NdgsMKEH5 rgAuvfGjmc2TT8Ztj3+0qU/d2vVU574Pkuz0QKQLpWp1i0QnJpFHNYn0dhPINh4a64KASuQQh q7P9uEvvh/r79MsxVK7BnWH+AQLzHeZaNdrBS0rORsMDqOHZT5HNUycUjer4KnJI4S98+N8pg LwMnzVBo8hvpHXlyQiz5L+nTeqJzyv7u79XRpqQkxsnBfIxeiBhUlSJPxuDGdK2oEYh+S4Gr3 0zH8O78a4Ox+3/oZdxiXr3YyO1lOzFO9DOUL+qKO0iuo8Fn4IWCWiK3LGTxozZS6169Wj1Dws ubkBqVfgMEkC14s04haMUF8G9211efB/kW1R+sfxlDS2WKvHJ/8udAQ8dgDy8Md8XKUAao8Ia QI+ErzEC8OxJARaMb7nbyd+mwJXJzIqsQ9i2EEKek28l3FQfo/aFaOHJ2VJXSqO9byOPD+rqn EHP30stPibKFOH0lMm+UMER0638a8OLFh/DnS37eqBzzewL0AavGfnkTSWb8nDrqn+KGUvjSy SDXvF+T9ngXmx+pYsRpjCjtkAz+noW54ZxYg5Jifc/DBACPyyaN1DIMvylQ= 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