From patchwork Fri Sep 8 04:39:17 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Jeffery X-Patchwork-Id: 811311 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=aj.id.au header.i=@aj.id.au header.b="bM5MVPJo"; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.b="cUp6wOAg"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3xpPlM27BGz9s82 for ; Fri, 8 Sep 2017 14:40:47 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752667AbdIHEkB (ORCPT ); Fri, 8 Sep 2017 00:40:01 -0400 Received: from out1-smtp.messagingengine.com ([66.111.4.25]:54815 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752757AbdIHEj6 (ORCPT ); Fri, 8 Sep 2017 00:39:58 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.nyi.internal (Postfix) with ESMTP id 02EC120BFB; Fri, 8 Sep 2017 00:39:58 -0400 (EDT) Received: from frontend1 ([10.202.2.160]) by compute4.internal (MEProxy); Fri, 08 Sep 2017 00:39:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aj.id.au; h=cc :date:from:in-reply-to:message-id:references:subject:to :x-me-sender:x-me-sender:x-sasl-enc:x-sasl-enc; s=fm1; bh=KoYjDx s13UIbroALTMsvHG4CKwn091z4Ys6237spqeE=; b=bM5MVPJoF/p6mt2qA77Kje O38odur6+W8vJFR3cJoIpYtv7Df0njL7qV4JUahSXYKgo0qVeUwstXuz4xNCxxQK FwLn05LkVXFyU9MPqmu0q24mqU9witYp74f0ES3b1ifQLCuUequwISeFLj//2SiP COnAbThkFVskQh1UAwN5OIHj7Wu7e8JhkeFxCCMPUFqnIeIJlms1I2AjZolKTh6v foSjzuXHBpZ5hvoUD720s4dyT7PfFBJKfT1MVNg2jqpaZnjehiNBoKJjzAgp1nNs jcayPoDyrLq5QxvGeYqw1Kxy6ENQcN9JGqz/lkBhI1+ImkB9LPh99nfe5zp/E95w == DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:date:from:in-reply-to:message-id :references:subject:to:x-me-sender:x-me-sender:x-sasl-enc :x-sasl-enc; s=fm1; bh=KoYjDxs13UIbroALTMsvHG4CKwn091z4Ys6237spq eE=; b=cUp6wOAgfiHjhFhXs4IY7mSqkdha+3x5Auw3IIyF/x6E8QvsSJdPyUP7k be1QOzcOuWtTl1ehUQnvHYXUBMqWppN5a5Boq14Ls/IVlrHDA02EmuAyp4WI+h9O xamrzfWBoPLY4F4vmpNojbmkT0KpVZo3DDeZ1lcyePzSI/HUFX/2HM9aunWmIP38 t/HOKIsEGKhieN79xH7gyjKuDr9lAEWqdcBBmZZ7w79ZlGhCs3PiMKkBlHFWLrEY T+x+/yeRY69ykYVfVzmv2IvD+6b0qjx5fMudM7cA25vWO7tqF00uSupoVBmYIE+4 4lrrFoUz5ZrOVag8k2NDhaqeJjvXg== X-ME-Sender: X-Sasl-enc: jNB4QclHe/Hf0BbifmUiUzE2SFe40bTEkaP6UmnASvRe 1504845597 Received: from keelia.ozlabs.ibm.com (unknown [122.99.82.10]) by mail.messagingengine.com (Postfix) with ESMTPA id 7E9BA7E426; Fri, 8 Sep 2017 00:39:54 -0400 (EDT) From: Andrew Jeffery To: linux@roeck-us.net, linux-hwmon@vger.kernel.org Cc: Andrew Jeffery , robh+dt@kernel.org, mark.rutland@arm.com, jdelvare@suse.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, joel@jms.id.au, mspinler@linux.vnet.ibm.com, msbarth@linux.vnet.ibm.com, openbmc@lists.ozlabs.org Subject: [PATCH v3 1/3] dt-bindings: hwmon: pmbus: Add Maxim MAX31785 documentation Date: Fri, 8 Sep 2017 14:39:17 +1000 Message-Id: <20170908043919.6924-2-andrew@aj.id.au> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170908043919.6924-1-andrew@aj.id.au> References: <20170908043919.6924-1-andrew@aj.id.au> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Signed-off-by: Andrew Jeffery --- .../devicetree/bindings/hwmon/pmbus/max31785.txt | 158 +++++++++++++++++++++ 1 file changed, 158 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/max31785.txt diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/max31785.txt b/Documentation/devicetree/bindings/hwmon/pmbus/max31785.txt new file mode 100644 index 000000000000..af9578e7742c --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/pmbus/max31785.txt @@ -0,0 +1,158 @@ +Bindings for the Maxim MAX31785 Intelligent Fan Controller +========================================================== + +Reference: + +https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf + +Required properties: +- compatible : One of "maxim,max31785" or "maxim,max31785a" +- reg : I2C address, one of 0x52, 0x53, 0x54, 0x55. +- #address-cells : Must be 1 +- #size-cells : Must be 0 +- #thermal-sensor-cells : Should be 1. The device supports: + - One internal sensor + - Four external I2C digital sensors + - Six external thermal diodes + +Optional properties: +- use-stored-presence : Do not treat the devicetree description as canon for + fan presence (the 'installed' bit of FAN_CONFIG_*). + Instead, rely on the on the default value store of + the device to populate it. + +Capabilities are configured through subnodes of the controller's node. + +Fans +---- + +Only fans with subnodes present will be considered as installed. If +use-stored-presence is present in the parent node, then only fans that are both +defined in the devicetree and have their installed bit set are considered +installed. + +Required subnode properties: +- compatible : Must be "pmbus-fan" +- reg : The PMBus page the properties apply to. +- #cooling-cells : Should be 2. See the thermal bindings at [1]. +- maxim,fan-rotor-input : The type of rotor measurement provided to the + controller. Must be either "tach" for tachometer + pulses or "lock" for a locked-rotor signal. +- maxim,fan-lock-polarity: Required iff maxim,fan-rotor-input is "lock". Valid + values are "low" for active low, "high" for active + high. + +Optional subnode properties: +- fan-mode : "rpm" or "pwm". Default value is "pwm". +- tach-pulses : Tachometer pulses per revolution. Valid values are + 1, 2, 3 or 4. The default is 1. +- cooling-min-level : Smallest cooling state accepted. See [1]. +- cooling-max-level : Largest cooling state accepted. See [1]. +- maxim,fan-no-fault-ramp: Do not ramp the fan to 100% PWM duty on detecting a + fan fault +- maxim,fan-startup : The number of rotations required before taking + emergency action for an unresponsive fan and driving + it with 100% or 0% PWM duty, depending on the state + of maxim,fan-no-fault-ramp. Valid values are 0 + (automatic spin-up disabled), 2, 4, or 8. Default + value is 0. +- maxim,fan-health : Enable automated fan health check +- maxim,fan-ramp : Configures how fast the device ramps the PWM duty + cycle from one value to another. Valid values are 0 + to 7 inclusive, with values 0 - 2 configuring a + 1000ms update rate and 1 - 3% duty respective duty + increase, and 3 - 7 a 200ms update rate with a 1 - + 5% respective duty increase. Default value is 0. +- maxim,fan-no-watchdog : Do not ramp fan to 100% PWM duty on failure to + update desired fan rate inside 10s. This implies + maxim,tmp-no-fault-ramp +- maxim,tmp-no-fault-ramp: Do not ramp fan to 100% PWM duty on temperature + sensor fault detection. This implies + maxim,fan-no-watchdog +- maxim,tmp-hysteresis : The temperature hysteresis used to determine + transitions to lower fan speed bands in the + temperature/fan rate lookup table. Valid values are + 2, 4, 6 or 8 (degrees celcius). Default value is 2. +- maxim,fan-dual-tach : Enable dual tachometer functionality +- maxim,fan-pwm-freq : The PWM frequency. Valid values are 30, 50, 100, 150 + and 25000 (Hz). Default value is 30Hz. +- maxim,fan-lookup-table : A 16-element cell array of alternating temperature + and rate values representing the look up table. The + rate units are set through the fan-mode property. +- maxim,fan-fault-pin-mon: Ramp fans to 100% PWM duty when the FAULT pin is + asserted + +Temperature +----------- + +Required subnode properties: +- compatible : Must be "pmbus-temperature" +- reg : The PMBus page the properties apply to. + +Optional subnode properties: +- maxim,tmp-offset : Valid values are 0 - 30 (degrees celcius) inclusive. + Default value is 0. +- maxim,tmp-fans : An array of phandles to fans controlled by the + current temperature sensor. + +[1] Documentation/devicetree/bindings/thermal/thermal.txt + +Example: + fan-max31785: max31785@52 { + reg = <0x52>; + compatible = "maxim,max31785"; + #address-cells = <1>; + #size-cells = <0>; + #thermal-sensor-cells = <1>; + + fan@0 { + compatible = "pmbus-fan"; + reg = <0>; + mode = "rpm"; + tach-pulses = <1>; + + #cooling-cells = <2>; + cooling-min-level = <0>; + cooling-max-level = <9>; + + maxim,fan-rotor-input = "tach"; + maxim,fan-dual-tach; + }; + + /* + * Hardware controlled fan: Fan speed is controlled by a + * temperature sensor feeding values into the lookup table. The + * fan association is done in the temperature sensor node. One + * sensor can drive multiple fans. + */ + cpu_fan: fan@1 { + compatible = "pmbus-fan"; + reg = <1>; + mode = "rpm"; + tach-pulses = <1>; + + #cooling-cells = <2>; + + maxim,fan-rotor-input = "tach"; + maxim,tmp-hysteresis = <2>; + maxim,fan-lookup-table = < + /* Temperature RPM */ + 0 1000 + 10 2000 + 20 3000 + 30 4000 + 40 5000 + 50 6000 + 60 7000 + 70 8000 + >; + }; + + cpu_temp: sensor@6 { + compatible = "pmbus-temperature"; + reg = <6>; + + maxim,tmp-offset = <0>; + maxim,tmp-fans = <&cpu_fan>; + }; + };