From patchwork Mon Apr 23 21:08:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Rosin X-Patchwork-Id: 903172 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; dmarc=none (p=none dis=none) header.from=axentia.se Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=axentia.se header.i=@axentia.se header.b="Z9SiUYXE"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40VJxY1XRXz9rxx for ; Tue, 24 Apr 2018 07:09:37 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932368AbeDWVIf (ORCPT ); Mon, 23 Apr 2018 17:08:35 -0400 Received: from mail-he1eur01on0126.outbound.protection.outlook.com ([104.47.0.126]:7294 "EHLO EUR01-HE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932157AbeDWVIa (ORCPT ); Mon, 23 Apr 2018 17:08:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axentia.se; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=wLb/qkgjFDJx3cf+vv4EqPLYVx/KeUch6ZCj6DOcqy8=; b=Z9SiUYXEIYwvztywyRkA2tBfLbMSqJJnzz8arCRbt68LKA0EOAG7ac/Gat9xlo3slqbjCvqnutA87UVsEkqwX78GBJoytC8VGGScNsxIWLFk+Lx30YqUG3KPapqwI7sQlMf0wtzfJR/izATXtdW7FkcM/MQb4IZUMXYbb8FvC3U= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=peda@axentia.se; Received: from orc.pedanet (85.226.244.23) by HE1PR0202MB2779.eurprd02.prod.outlook.com (2603:10a6:3:e8::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.20.696.13; Mon, 23 Apr 2018 21:08:25 +0000 From: Peter Rosin To: linux-kernel@vger.kernel.org Cc: Peter Rosin , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Rob Herring , Mark Rutland , "David S. Miller" , Greg Kroah-Hartman , Mauro Carvalho Chehab , Linus Walleij , Andrew Morton , Randy Dunlap , "Andrew F . Davis" , Fabio Estevam , linux-iio@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v4 1/4] dt-bindings: iio: afe: add binding for current-sense-shunt Date: Mon, 23 Apr 2018 23:08:06 +0200 Message-Id: <20180423210809.29586-2-peda@axentia.se> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180423210809.29586-1-peda@axentia.se> References: <20180423210809.29586-1-peda@axentia.se> MIME-Version: 1.0 X-Originating-IP: [85.226.244.23] X-ClientProxiedBy: CWLP265CA0150.GBRP265.PROD.OUTLOOK.COM (2603:10a6:401:52::18) To HE1PR0202MB2779.eurprd02.prod.outlook.com (2603:10a6:3:e8::21) X-MS-PublicTrafficType: Email X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(4652020)(7021125)(5600026)(4534165)(7022125)(4603075)(4627221)(201702281549075)(7048125)(7024125)(7027125)(7028125)(7023125)(2017052603328)(7153060)(7193020); SRVR:HE1PR0202MB2779; X-Microsoft-Exchange-Diagnostics: 1; HE1PR0202MB2779; 3:pAI760QTwp2/fncrl6k4ZT4O3+gEZ6wHsnpe0LHarQQzlwncPjvGwY07ADJinoau2/AOd4tuc1c9hI6dlwaoNqnCo8xZqYtf9NtAwHuhDGYX12X2kQjnPt+Z4NaWh2UsR911msA3f4bOtjjfu6Vf20onUh3IOiVfOC+JWCpT+e7wRjHesfE54luAVOX9XxgdFasa6iTKPyZtbi0Mxh2iAY0jPU1uD0PHhr5BnbO7kNxG8iSrxVn+qvr7LCzAPjvd; 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This binding describe one cases, a current through a shunt resistor measured by the voltage over it. Reviewed-by: Rob Herring Signed-off-by: Peter Rosin --- .../bindings/iio/afe/current-sense-shunt.txt | 41 ++++++++++++++++++++++ MAINTAINERS | 6 ++++ 2 files changed, 47 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt diff --git a/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt b/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt new file mode 100644 index 000000000000..4d842aa85040 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt @@ -0,0 +1,41 @@ +Current Sense Shunt +=================== + +When an io-channel measures the voltage over a current sense shunt, +the interesting mesaurement is almost always the current through the +shunt, not the voltage over it. This binding describes such a current +sense circuit. + +Required properties: +- compatible : "current-sense-shunt" +- io-channels : Channel node of a voltage io-channel. +- shunt-resistor-micro-ohms : The shunt resistance in microohms. + +Example: +The system current is measured by measuring the voltage over a +3.3 ohms shunt resistor. + +sysi { + compatible = "current-sense-shunt"; + io-channels = <&tiadc 0>; + + /* Divide the voltage by 3300000/1000000 (or 3.3) for the current. */ + shunt-resistor-micro-ohms = <3300000>; +}; + +&i2c { + tiadc: adc@48 { + compatible = "ti,ads1015"; + reg = <0x48>; + #io-channel-cells = <1>; + + #address-cells = <1>; + #size-cells = <0>; + + channel@0 { /* IN0,IN1 differential */ + reg = <0>; + ti,gain = <1>; + ti,datarate = <4>; + }; + }; +}; diff --git a/MAINTAINERS b/MAINTAINERS index 36a28e979e9a..0f7bec878919 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6889,6 +6889,12 @@ F: drivers/staging/iio/ F: include/linux/iio/ F: tools/iio/ +IIO UNIT CONVERTER +M: Peter Rosin +L: linux-iio@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt + IKANOS/ADI EAGLE ADSL USB DRIVER M: Matthieu Castet M: Stanislaw Gruszka