From patchwork Wed Feb 25 15:34:17 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 5881041 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 A5CD29F269 for ; Wed, 25 Feb 2015 15:37:06 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CA75F2034E for ; Wed, 25 Feb 2015 15:37:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E08F92037E for ; Wed, 25 Feb 2015 15:37:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753574AbbBYPer (ORCPT ); Wed, 25 Feb 2015 10:34:47 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:19402 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753569AbbBYPen (ORCPT ); Wed, 25 Feb 2015 10:34:43 -0500 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NKC006WL39SK2A0@mailout3.samsung.com>; Thu, 26 Feb 2015 00:34:41 +0900 (KST) X-AuditID: cbfee61a-f79c06d000004e71-da-54edeb90367b Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 9A.14.20081.09BEDE45; Thu, 26 Feb 2015 00:34:40 +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 <0NKC00MHG39D86A0@mmp1.samsung.com>; Thu, 26 Feb 2015 00:34:40 +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 v5 1/6] Documentation: dts: Documentation entry to explain how to use PWM FAN as a cooling device Date: Wed, 25 Feb 2015 16:34:17 +0100 Message-id: <1424878462-15511-2-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-reply-to: <1424878462-15511-1-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> <1424878462-15511-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrKLMWRmVeSWpSXmKPExsVy+t9jAd0Jr9+GGPx+Km7xeM1iJov5R86x Wsy/co3VYundT2wWP15fYLNY81fJonfBVTaL/sevmS3ePOK2ePNwM6PF5V1z2Cw+9x5htJhx fh+TxZOFZ5gs7kzby2Yx/fhbVgcBj7/Pr7N47Jx1l91j06pONo8HE3ezeayb9pbZY+f3BnaP vi2rGD02n672+LxJLoAzissmJTUnsyy1SN8ugSujZ/cFtoIZ/BU7P/WyNTD+5e5i5OSQEDCR ePminRnCFpO4cG89WxcjF4eQwCJGiVc3ZjNDOF1MEqv39zOCVLEJ6El8vvuUCSQhIrCdUWLF vG9gLcwC15gl9m0+ygRSJSxQLHHrywd2EJtFQFViVlM/WJxXwE1izbIjbBD7FCW6n00AszkF 3CXmvnnODrGumVHi1sVpzBMYeRcwMqxiFE0tSC4oTkrPNdQrTswtLs1L10vOz93ECA7sZ1I7 GFc2WBxiFOBgVOLhTRB+EyLEmlhWXJl7iFGCg1lJhLf17NsQId6UxMqq1KL8+KLSnNTiQ4zS HCxK4rxK9m0hQgLpiSWp2ampBalFMFkmDk6pBsad+tsrrk2eXtzrNOUR360DF70Pef56+q1q meO2k36e3OwL7Exlvh/MZBAuPTPlN3/H3pkWLu6v/mVMn/d0s9HEUysOHT48fWXUpJyAjnex N5cnfBEQeuC/8ZbLspKVds5zQnX2SDZ4/Zy35kFufNNXrl0/WlSXGntXvQp/yb6kdLfthkdS b/uMlFiKMxINtZiLihMBCV52L2gCAAA= 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 --- .../devicetree/bindings/hwmon/pwm-fan.txt | 25 +++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 610757c..645251b 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt @@ -3,10 +3,33 @@ 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"; pwms = <&pwm 0 10000 0>; + cooling-levels = <0 102 170 230>; + }; + + thermal-zones { + cpu_thermal: cpu-thermal { + cooling-min-state = <0>; + cooling-max-state = <3>; + #cooling-cells = <2>; + trips { + cpu_alert1: cpu-alert1 { + temperature = <100000>; /* millicelsius */ + hysteresis = <2000>; /* millicelsius */ + type = "passive"; + }; + }; + cooling-maps { + map0 { + trip = <&cpu_alert1>; + cooling-device = <&fan0 0 1>; + }; + }; };