From patchwork Fri Jun 25 13:25:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naveen Krishna Chatradhi X-Patchwork-Id: 12345069 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09A82C2B9F4 for ; Fri, 25 Jun 2021 13:26:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6FFD61628 for ; Fri, 25 Jun 2021 13:26:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231617AbhFYN2b (ORCPT ); Fri, 25 Jun 2021 09:28:31 -0400 Received: from mail-bn7nam10on2055.outbound.protection.outlook.com ([40.107.92.55]:10336 "EHLO NAM10-BN7-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S231708AbhFYN2a (ORCPT ); Fri, 25 Jun 2021 09:28:30 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=SUxFtDeJsWIh8UZtpJU7bs7WTDN7iyHama5shDIKEuifaDtplLGfU7O+Zs4ryxIoM4MZXJzqUBrnIkePTW3C4+rSrzWrwy+TqR1y7zrq/3fBlVuspf0hXS+PbbOuWWlbH3aHMz1iXlnWMBKYzH0Mg0cefi7OhFRY1ImlpK6KkX8LzvwVTX99z1AkknHcFBif2ELjdnAwTggUP6z31PrfDwxuumMxRNkNneVeAfJ065kO9RkJaKv+3gwxP6H9qR6rK0h94pvSUthNbmTU5yz7pGrrLkx2SM0UaBgLaIZvJTi+HmG8FShbVcIlEq4DACRv/ZVvYk+TAZnGsfr7ADRYxg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=LR1nLqNNzxt6CPpxphGQkw04PuVRroGHthGbtDtcET8=; b=oFLnN+S9ueNSUEg00bDe2sRizw9zUZp7D8qojfKoC3iPgIZGRIzFR7x/Oms8lmzZIK6Qsc5gz/uf5tk4mONPTBAKvERpswgnD5IZwOUOfvrTDQR1o3FNDcsAra0qTLgXu52NIm7w7RkUwiN0b66cQRVdvUB5EvFNQAjPRNjyDbB8hVUob7ZTNsk0iqz6VEiaNdtgNlRjzdUspW5WmTtaFN10DBigOY/MdtCp2Og1s1Om2D9JVdDLy7KZ2GANTjEYdzUKzQPA+Blgdqppc95mQW8fYyqa3e5wBMIatR1u7XvJQBBNr0MVaAGnnfZfjPBLv3bCt0ti33OocfplIJFR+Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=LR1nLqNNzxt6CPpxphGQkw04PuVRroGHthGbtDtcET8=; b=draCeQdPeidaE/pnXjwtrmm6KhVRbQOgbJrKo+ETuqHo9azUwGvFzqP6cg21uHkHZyzcBq19vzd3gXJxDACkuOK/ZGtq/QFCkMQzndK2hNRWq4O6WBNBjJyAhSFrPDNMWZw783ebjjym8XSMzs1R7buwssQUsRu5pQ3B6snFkQE= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=amd.com; Received: from BL1PR12MB5286.namprd12.prod.outlook.com (2603:10b6:208:31d::6) by BL1PR12MB5255.namprd12.prod.outlook.com (2603:10b6:208:315::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4264.18; Fri, 25 Jun 2021 13:26:08 +0000 Received: from BL1PR12MB5286.namprd12.prod.outlook.com ([fe80::1514:9ec7:76dd:568c]) by BL1PR12MB5286.namprd12.prod.outlook.com ([fe80::1514:9ec7:76dd:568c%7]) with mapi id 15.20.4264.021; Fri, 25 Jun 2021 13:26:08 +0000 From: Naveen Krishna Chatradhi To: linux-hwmon@vger.kernel.org Cc: linux@roeck-us.net, Akshay Gupta , Naveen Krishna Chatradhi Subject: [PATCH 2/3] hwmon: sbrmi: Add Documentation Date: Fri, 25 Jun 2021 18:55:43 +0530 Message-Id: <20210625132544.18094-2-nchatrad@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210625132544.18094-1-nchatrad@amd.com> References: <20210625132544.18094-1-nchatrad@amd.com> X-Originating-IP: [165.204.156.251] X-ClientProxiedBy: MA1PR01CA0171.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:d::17) To BL1PR12MB5286.namprd12.prod.outlook.com (2603:10b6:208:31d::6) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from milan-ETHANOL-X.amd.com (165.204.156.251) by MA1PR01CA0171.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:d::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4264.20 via Frontend Transport; Fri, 25 Jun 2021 13:26:06 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1a2ddcec-380a-45bb-e1a8-08d937dccad0 X-MS-TrafficTypeDiagnostic: BL1PR12MB5255: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL1PR12MB5286.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(346002)(396003)(376002)(136003)(39860400002)(1076003)(8676002)(36756003)(54906003)(2616005)(6916009)(956004)(8936002)(4326008)(2906002)(38100700002)(38350700002)(26005)(186003)(7696005)(83380400001)(6666004)(966005)(66946007)(5660300002)(16526019)(66476007)(478600001)(316002)(6486002)(52116002)(66556008);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1a2ddcec-380a-45bb-e1a8-08d937dccad0 X-MS-Exchange-CrossTenant-AuthSource: BL1PR12MB5286.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Jun 2021 13:26:08.6517 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: U3vCTT2b3Z26J0ntCmwPMBTlQQvlUiEgy1aISugBXGdAkoELD5PjqX+04TkpsuN7OeB0D1oyub4Wyus+WGja7g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5255 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Akshay Gupta - Add documentation for sbrmi module Signed-off-by: Akshay Gupta Signed-off-by: Naveen Krishna Chatradhi --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/sbrmi.rst | 79 +++++++++++++++++++++++++++++++++++ 2 files changed, 80 insertions(+) create mode 100644 Documentation/hwmon/sbrmi.rst diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 9ed60fa84cbe..5cd4798fe193 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -158,6 +158,7 @@ Hardware Monitoring Kernel Drivers q54sj108a2 raspberrypi-hwmon sbtsi_temp + sbrmi sch5627 sch5636 scpi-hwmon diff --git a/Documentation/hwmon/sbrmi.rst b/Documentation/hwmon/sbrmi.rst new file mode 100644 index 000000000000..db50393167bb --- /dev/null +++ b/Documentation/hwmon/sbrmi.rst @@ -0,0 +1,79 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Kernel driver sbrmi +=================== + +Supported hardware: + + * Sideband Remote Management Interface (SB-RMI) compliant AMD SoC + device connected to the BMC via the APML. + + Prefix: 'sbrmi' + + Addresses scanned: This driver doesn't support address scanning. + + To instantiate this driver on an AMD CPU with SB-RMI + support, the i2c bus number would be the bus connected from the board + management controller (BMC) to the CPU. + The SMBus address is really 7 bits. Some vendors and the SMBus + specification show the address as 8 bits, left justified with the R/W + bit as a write (0) making bit 0. Some vendors use only the 7 bits + to describe the address. + As mentioned in AMD's APML specification, The SB-RMI address is + normally 78h(0111 100W) or 3Ch(011 1100) for socket 0 and 70h(0111 000W) + or 38h(011 1000) for socket 1, but it could vary based on hardware + address select pins. + + Datasheet: The SB-RMI interface and protocol along with the Advanced + Platform Management Link (APML) Specification is available + as part of the open source SoC register reference at: + + https://www.amd.com/en/support/tech-docs?keyword=55898 + +Author: Akshay Gupta + +Description +----------- + +The APML provides a way to communicate with the SB Remote Management interface +(SB-RMI) module from the external SMBus master that can be used to report socket +power on AMD platforms using mailbox command and resembles a typical 8-pin remote +power sensor's I2C interface to BMC. + +This driver implements current power with power cap and power cap max. + +sysfs-Interface +--------------- +Power sensors can be queried and set via the standard ``hwmon`` interface +on ``sysfs``, under the directory ``/sys/class/hwmon/hwmonX`` for some value +of ``X`` (search for the ``X`` such that ``/sys/class/hwmon/hwmonX/name`` has +content ``sbrmi``) + +================ ===== ======================================================== +Name Perm Description +================ ===== ======================================================== +power#_input RO Current Power consumed +power#_cap RW Power limit can be set between 0 and power#_cap_max +power#_cap_max RO Maximum powerlimit calculated and reported by the SMU FW +================ ===== ======================================================== + +The following example show how the 'Power' attribute from the i2c-addresses +can be monitored using the userspace utilities like ``sensors`` binary:: + + # sensors + sbrmi-i2c-1-38 + Adapter: bcm2835 I2C adapter + power1: 61.00 W (cap = 225.00 W) + + sbrmi-i2c-1-3c + Adapter: bcm2835 I2C adapter + power1: 28.39 W (cap = 224.77 W) + # + +Also, Below shows how get and set the values from sysfs entries individually:: + # cat /sys/class/hwmon/hwmon1/power1_cap_max + 225000000 + + # echo 180000000 > /sys/class/hwmon/hwmon1/power1_cap + # cat /sys/class/hwmon/hwmon1/power1_cap + 180000000