From patchwork Fri Feb 6 16:59:03 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 5793651 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 7B6879F336 for ; Fri, 6 Feb 2015 17:02:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AB86D20154 for ; Fri, 6 Feb 2015 17:02:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C09612014A for ; Fri, 6 Feb 2015 17:02:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758325AbbBFQ7n (ORCPT ); Fri, 6 Feb 2015 11:59:43 -0500 Received: from mailout1.samsung.com ([203.254.224.24]:39757 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758287AbbBFQ7k (ORCPT ); Fri, 6 Feb 2015 11:59:40 -0500 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NJD00ERW0JE9F80@mailout1.samsung.com>; Sat, 07 Feb 2015 01:59:38 +0900 (KST) X-AuditID: cbfee61a-f79c06d000004e71-93-54d4f2fa7614 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 32.61.20081.AF2F4D45; Sat, 07 Feb 2015 01:59:38 +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 <0NJD004390IME190@mmp1.samsung.com>; Sat, 07 Feb 2015 01:59:38 +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 v3 3/8] Documentation: dts: Documentation entry to explain how to use PWM FAN as a cooling device Date: Fri, 06 Feb 2015 17:59:03 +0100 Message-id: <1423241948-31981-4-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-reply-to: <1423241948-31981-1-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> <1423241948-31981-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrKLMWRmVeSWpSXmKPExsVy+t9jAd1fn66EGBzZJ2nxeM1iJov5R86x Wsy/co3VYundT2wWP15fYLNY81fJonfBVTaL/sevmS3ePOK2ePNwM6PF5V1z2Cw+9x5htJhx fh+TxZOFZ5gs7kzby2Yx/fhbVgcBj7/Pr7N47Jx1l91j06pONo8HE3ezeayb9pbZY+f3BnaP vi2rGD02n672+LxJLoAzissmJTUnsyy1SN8ugSujY/pu5oIvvBV9j1ayNjBO5e5i5OSQEDCR aL+zkhHCFpO4cG89WxcjF4eQwCJGifYdZ5khnC4miaVnHzGDVLEJ6El8vvuUCSQhIrCdUWLF vG9gLcwC15gl9m0+ygRSJSxQLDHnzG8WEJtFQFXi/ccnYDavgJvElCVr2SD2KUp0P5sAZnMK uEscvLeLHWJdM6PEwl1HmCYw8i5gZFjFKJpakFxQnJSea6hXnJhbXJqXrpecn7uJERzYz6R2 MK5ssDjEKMDBqMTDm8B7JUSINbGsuDL3EKMEB7OSCG/PUqAQb0piZVVqUX58UWlOavEhRmkO FiVxXiX7thAhgfTEktTs1NSC1CKYLBMHp1QDY1tb62T5R7r69Z0yXxTNzj2/2bbo2/fJVX8/ v5uSuHWdVFKhZ4K405e7TJO6U5xmMOde2SrBv7bplu/kB+J7/dlClvMc3cX6bVXqC9sPs/1+ qxU37D/6fIrM2f6tqX+PmDIYPvlyLuBFgJ1KxpbWj1K7rs/rPmbS9kmE84vqKo5g960KN2es blZiKc5INNRiLipOBABNvB9caAIAAA== 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 --- 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 --- 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>; };