From patchwork Wed Dec 9 07:59:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Troy Lee X-Patchwork-Id: 1413257 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=aspeedtech.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CrV8f5z7qz9sWL for ; Wed, 9 Dec 2020 19:10:10 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728222AbgLIIJf (ORCPT ); Wed, 9 Dec 2020 03:09:35 -0500 Received: from twspam01.aspeedtech.com ([211.20.114.71]:46462 "EHLO twspam01.aspeedtech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728441AbgLIICb (ORCPT ); Wed, 9 Dec 2020 03:02:31 -0500 Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 0B97uULH009071; Wed, 9 Dec 2020 15:56:31 +0800 (GMT-8) (envelope-from troy_lee@aspeedtech.com) Received: from TroyLee-PC.localdomain (192.168.100.253) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 9 Dec 2020 15:59:26 +0800 From: Troy Lee To: , Jean Delvare , "Guenter Roeck" , Rob Herring , Joel Stanley , Andrew Jeffery , Jonathan Corbet , Philipp Zabel , "open list:HARDWARE MONITORING" , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , "moderated list:ARM/ASPEED MACHINE SUPPORT" , "moderated list:ARM/ASPEED MACHINE SUPPORT" , open list , "open list:DOCUMENTATION" CC: , , , , Subject: [PATCH 1/4] dt-bindings: hwmon: Add Aspeed AST2600 PWM/Fan Date: Wed, 9 Dec 2020 15:59:17 +0800 Message-ID: <20201209075921.26689-2-troy_lee@aspeedtech.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201209075921.26689-1-troy_lee@aspeedtech.com> References: <20201209075921.26689-1-troy_lee@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.100.253] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 0B97uULH009071 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org For supporting a new AST2600 PWM/Fan hwmon driver, we add a new binding. Signed-off-by: Troy Lee --- .../bindings/hwmon/aspeed2600-pwm-tacho.txt | 69 +++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed2600-pwm-tacho.txt diff --git a/Documentation/devicetree/bindings/hwmon/aspeed2600-pwm-tacho.txt b/Documentation/devicetree/bindings/hwmon/aspeed2600-pwm-tacho.txt new file mode 100644 index 000000000000..61b11914352f --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/aspeed2600-pwm-tacho.txt @@ -0,0 +1,69 @@ +ASPEED AST2600 PWM and Fan Tacho controller device driver + +The ASPEED PWM controller can support upto 16 PWM outputs. The ASPEED Fan Tacho +controller can support upto 16 Fan tachometer inputs. + +There can be upto 16 fans supported. Each fan can have one PWM output and +one Fan tach inputs. + +Required properties for pwm-tacho node: +- #address-cells : should be 1. + +- #size-cells : should be 0. + +- #cooling-cells: should be 2. + +- reg : address and length of the register set for the device. + +- pinctrl-names : a pinctrl state named "default" must be defined. + +- pinctrl-0 : phandle referencing pin configuration of the PWM ports. + +- compatible : should be "aspeed,ast2600-pwm-tachometer". + +- clocks : phandle to clock provider with the clock number in the second cell + +- resets : phandle to reset controller with the reset number in the second cell + +fan subnode format: +=================== +Under fan subnode there can upto 16 child nodes, with each child node +representing a fan. There are 16 fans each fan can have one PWM port and one +Fan tach inputs. +For PWM port can be configured cooling-levels to create cooling device. +Cooling device could be bound to a thermal zone for the thermal control. + +Required properties for each child node: +- reg : should specify PWM source port. + integer value in the range 0x00 to 0x0f with 0x00 indicating PWM port 0 + and 0x0f indicating PWM port F. + +- cooling-levels: PWM duty cycle values in a range from 0 to 255 + which correspond to thermal cooling states. + +- aspeed,fan-tach-ch : should specify the Fan tach input channel. + integer value in the range 0 through 15, with 0 indicating + Fan tach channel 0 and 15 indicating Fan tach channel 15. + Atleast one Fan tach input channel is required. + +- aspeed,target-pwm : Specify the frequency of PWM. The value range from 24 to + 780000. Default value will be set to 25000. + +- aspeed,pulse-pr : Specify tacho pulse per revolution of the fan. A general + parameter of pulse-pr is 2. + +Examples: + +&pwm_tacho { + status = "okay"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_pwm0_default &pinctrl_tach0_default>; + + fan@0 { + reg = <0x00>; + aspeed,target-pwm = <25000>; + cooling-levels = /bits/ 8 <125 151 177 203 229 255>; + aspeed,fan-tach-ch = /bits/ 8 <0x00>; + aspeed,pulse-pr = <2>; + }; +};