From patchwork Thu Feb 26 13:59:32 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 5893081 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 8DEEF9F373 for ; Thu, 26 Feb 2015 14:00:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C701D203A9 for ; Thu, 26 Feb 2015 14:00:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6791B203A4 for ; Thu, 26 Feb 2015 14:00:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932191AbbBZOAE (ORCPT ); Thu, 26 Feb 2015 09:00:04 -0500 Received: from mailout4.samsung.com ([203.254.224.34]:27565 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932176AbbBZOAA (ORCPT ); Thu, 26 Feb 2015 09:00:00 -0500 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout4.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NKD00KOFTJYY5A0@mailout4.samsung.com>; Thu, 26 Feb 2015 22:59:58 +0900 (KST) X-AuditID: cbfee61a-f79c06d000004e71-06-54ef26de7c81 Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 09.20.20081.ED62FE45; Thu, 26 Feb 2015 22:59:58 +0900 (KST) Received: from mcdsrvbld02.digital.local ([106.116.37.23]) by mmp2.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NKD00J76TJFTR60@mmp2.samsung.com>; Thu, 26 Feb 2015 22:59:58 +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 v6 1/6] Documentation: dts: Documentation entry to explain how to use PWM FAN as a cooling device Date: Thu, 26 Feb 2015 14:59:32 +0100 Message-id: <1424959177-28739-2-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-reply-to: <1424959177-28739-1-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> <1424959177-28739-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrMLMWRmVeSWpSXmKPExsVy+t9jQd17au9DDPpmKVg8XrOYyWL+kXOs FvOvXGO1WHr3E5vFj9cX2CzW/FWy6F1wlc2i//FrZos3j7gt3jzczGhxedccNovPvUcYLWac 38dk8WThGSaLO9P2sllMP/6W1UHA4+/z6yweO2fdZffYtKqTzePBxN1sHuumvWX22Pm9gd2j b8sqRo/Np6s9Pm+SC+CM4rJJSc3JLEst0rdL4MqYePw3e0GjUMWHeffYGhg/8nYxcnBICJhI bJot2cXICWSKSVy4t56ti5GLQ0hgOqPE05+b2SGcLiaJCS3LWUGq2AT0JD7ffcoEkhAR2M4o sWLeN7AWZoFrzBL7Nh9lAhkrLFAs8eGoJ0gDi4CqxM39z9lAbF4BN4njf58wQaxTlOh+NgEs zingLvG04R7U6mZGiUmXFzNOYORdwMiwilE0tSC5oDgpPddQrzgxt7g0L10vOT93EyM4qJ9J 7WBc2WBxiFGAg1GJhzch+12IEGtiWXFl7iFGCQ5mJRFeNqX3IUK8KYmVValF+fFFpTmpxYcY pTlYlMR5lezbQoQE0hNLUrNTUwtSi2CyTBycUg2MWr3lMVfKTfZKKl47MMl7ckGiTrKU+06G +nhxZzXHx0sXigo/Pfbt4eKJbySm+7V0nzhRw6zxkqNR10Fp8wq+xymSq54lNvct1jHanHQi g+thWdCWtsY7ZafPv5t4L3yLEEdLk1TJhNNfMg7dntf1sb9djMVZP3VKn6iNjTCDTd0J3ZZi fgUlluKMREMt5qLiRABJvojEZgIAAA== Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@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 Acked-by: Eduardo Valentin --- 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 Changes for v5: - Move thermal-zones description to example section - Extending example section Changes for v6: - cooling-{min|max}-state properties added to pwm-fan binding - Mandatory properties for thermal-zones added - Indentation fixed --- .../devicetree/bindings/hwmon/pwm-fan.txt | 29 ++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 610757c..c6d5332 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt @@ -3,10 +3,35 @@ 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 Example: - pwm-fan { + fan0: pwm-fan { compatible = "pwm-fan"; - status = "okay"; + cooling-min-state = <0>; + cooling-max-state = <3>; + #cooling-cells = <2>; pwms = <&pwm 0 10000 0>; + cooling-levels = <0 102 170 230>; }; + + thermal-zones { + cpu_thermal: cpu-thermal { + thermal-sensors = <&tmu 0>; + polling-delay-passive = <0>; + polling-delay = <0>; + trips { + cpu_alert1: cpu-alert1 { + temperature = <100000>; /* millicelsius */ + hysteresis = <2000>; /* millicelsius */ + type = "passive"; + }; + }; + cooling-maps { + map0 { + trip = <&cpu_alert1>; + cooling-device = <&fan0 0 1>; + }; + }; + };