From patchwork Wed Feb 18 10:07:31 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 5843141 X-Patchwork-Delegate: eduardo.valentin@ti.com Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 65CADBF440 for ; Wed, 18 Feb 2015 10:10:37 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A31E52024C for ; Wed, 18 Feb 2015 10:10:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B51A220211 for ; Wed, 18 Feb 2015 10:10:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751165AbbBRKKe (ORCPT ); Wed, 18 Feb 2015 05:10:34 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:35597 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751002AbbBRKKd (ORCPT ); Wed, 18 Feb 2015 05:10:33 -0500 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NJY009S0PLJMOA0@mailout3.samsung.com>; Wed, 18 Feb 2015 19:10:31 +0900 (KST) X-AuditID: cbfee61b-f79d76d0000024d6-36-54e465174d33 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id AA.9B.09430.71564E45; Wed, 18 Feb 2015 19:10:31 +0900 (KST) Received: from mcdsrvbld02.digital.local ([106.116.37.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NJY00IQ4PGTKC50@mmp1.samsung.com>; Wed, 18 Feb 2015 19:10:31 +0900 (KST) From: Lukasz Majewski To: Eduardo Valentin , Kamil Debski , Jean Delvare , Guenter Roeck , Kukjin Kim Cc: lm-sensors@lm-sensors.org, Linux PM list , "linux-samsung-soc@vger.kernel.org" , devicetree@vger.kernel.org, Lukasz Majewski , Kukjin Kim , linux-kernel@vger.kernel.org, Sjoerd Simons , Abhilash Kesavan , Abhilash Kesavan , Lukasz Majewski Subject: [PATCH v4 3/8] Documentation: dts: Documentation entry to explain how to use PWM FAN as a cooling device Date: Wed, 18 Feb 2015 11:07:31 +0100 Message-id: <1424254056-5904-4-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-reply-to: <1424254056-5904-1-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> <1424254056-5904-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCLMWRmVeSWpSXmKPExsVy+t9jAV3x1CchBjuOqVo8XrOYyWL+kXOs FvOvXGO1WHr3E5vFj9cX2CzW/FWy6F1wlc2i//FrZos3j7gt3jzczGhxedccNovPvUcYLWac 38dk8WThGSaLO9P2sllMP/6W1UHA4+/z6yweO2fdZffYtKqTzePBxN1sHuumvWX22Pm9gd2j b8sqRo/Np6s9Pm+SC+CM4rJJSc3JLEst0rdL4Mo4emU7U0EvX8XDTz9YGhiXc3cxcnBICJhI fP/L08XICWSKSVy4t56ti5GLQ0hgEaPEnf4OKKeLSWJOxyMmkCo2AT2Jz3efMoEkRAS2M0qs mPcNrIpZ4BqzxL7NR8GqhAWKJX492MYCYrMIqEp0v29iBbF5BVwlzlz+xQyxT1Gi+9kENhCb U8BNYuueZewQ65oYJeYt/ck8gZF3ASPDKkbR1ILkguKk9FwjveLE3OLSvHS95PzcTYzgsH4m vYNxVYPFIUYBDkYlHt6G349DhFgTy4orcw8xSnAwK4nwxsc/CRHiTUmsrEotyo8vKs1JLT7E KM3BoiTOq2TfFiIkkJ5YkpqdmlqQWgSTZeLglGpgZH++WPDbDZv0+oemq+ft+hgl3PDBqKZa 7Gd8luKZmz+mPzmW0XaAn6Pn1xZeht//9i3bc13OO3WOxvFtDF7CqVq727z0lGusDqfOn3mO WSM7YE11mthz94/H/0qlP1+yp0iV2e3Y92bjP6W7je4W6D1mntn09NbfmaoP8m9dNuYX1tMX +CIkqcRSnJFoqMVcVJwIAMmVlwlnAgAA Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Explanation of several properties, which allow PWM fan working as a cooling device, have been embraced in this commit. Signed-off-by: Lukasz Majewski --- Changes for v2: - Rename cooling-pwm-values to cooling-levels - Remove default-pulse-width property and stick to default hwmon policy Changes for v3: - Changing commit title from "hwmon: dts: Doc:" to "Documentation: dts" - Remove unnecessary properties - Set maximal cooling level to 230 instead of 255 Changes for v4: - None --- Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 610757c..d53fe0c 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt @@ -3,10 +3,30 @@ Bindings for a fan connected to the PWM lines Required properties: - compatible : "pwm-fan" - pwms : the PWM that is used to control the PWM fan +- cooling-levels : PWM duty cycle values in a range from 0 to 255 + which correspond to thermal cooling states + +Thorough description of the following bindings: + cooling-min-state = <0>; + cooling-max-state = <3>; + #cooling-cells = <2>; + thermal-zone { + cpu_thermal: cpu-thermal { + cooling-maps { + map0 { + trip = <&cpu_alert1>; + cooling-device = <&fan0 0 1>; + }; + }; + }; + +for PWM FAN used as cooling device can be found at: +./Documentation/devicetree/bindings/thermal/thermal.txt Example: pwm-fan { compatible = "pwm-fan"; status = "okay"; pwms = <&pwm 0 10000 0>; + cooling-levels = <0 102 170 230>; };