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Wysocki" , Jeremy Linton , Andrew Lunn , Andy Shevchenko , Florian Fainelli , Russell King - ARM Linux admin , Cristi Sovaiala , Florin Laurentiu Chiculita , Ioana Ciornei , Madalin Bucur , Heikki Krogerus , Marcin Wojtas , Pieter Jansen Van Vuuren , Jon Cc: linux.cj@gmail.com, Laurentiu Tudor , Diana Madalina Craciun , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, Calvin Johnson , Len Brown , "Rafael J. Wysocki" Subject: [net-next PATCH v2 01/14] Documentation: ACPI: DSD: Document MDIO PHY Date: Tue, 15 Dec 2020 22:13:02 +0530 Message-Id: <20201215164315.3666-2-calvin.johnson@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201215164315.3666-1-calvin.johnson@oss.nxp.com> References: <20201215164315.3666-1-calvin.johnson@oss.nxp.com> Content-Type: text/plain X-Originating-IP: [14.142.151.118] X-ClientProxiedBy: SG2PR06CA0152.apcprd06.prod.outlook.com (2603:1096:1:1f::30) To AM0PR04MB5636.eurprd04.prod.outlook.com (2603:10a6:208:130::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from lsv03152.swis.in-blr01.nxp.com (14.142.151.118) by SG2PR06CA0152.apcprd06.prod.outlook.com (2603:1096:1:1f::30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3654.12 via Frontend Transport; Tue, 15 Dec 2020 16:43:50 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 79d14ee5-2895-4de3-18e1-08d8a1189db0 X-MS-TrafficTypeDiagnostic: AM0PR04MB6963: X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: BiaW/SIdeZC5k7Kaykm0mTajYiyERoMBaUZMnsc9BGZQKLRmW1Kf/9mtYMkvXusa0VD8r1HtIDKxmebXHXh8ZbXuii+/Hd4Nr0SsSuidLhacYnAGMkHQdsxYCgw6T4HFiUT/SURaOmi/N/uXBVvQfKTFH3eTJ+j8i8CJLWg8OxvUyI45QNK+y2J+APC2l5+6udFYkh/20niu0sBlI9pmbIgekKHMfHvnf2ibI5A27pd7j962BrGHEjVcIMsno2hoUbg/zuO4jhsg6mgceZ112EYcW1ljZbONNlAczCPlnfrV0DbM16L1kEYQGDUm55ws3gikRGuzuuB8Xl16TpPy5otyWFV2Xq+kXaxL4DwcT1iyuNoTINyhqVIVUbpYp9D1SwPP1oTDdhde5yj/l8HvPnlWqpEwg6oE2cSiqWMC/3m0ndSuDYjrGoiQv8bGLfNa6WAI3EeMZJZWQHYRTrQDCQimmZktvhxpEMyPKX4cPiQ= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM0PR04MB5636.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(54906003)(8936002)(4326008)(6506007)(498600001)(83380400001)(66946007)(921005)(966005)(2616005)(956004)(86362001)(52116002)(16526019)(8676002)(2906002)(26005)(6512007)(44832011)(7416002)(186003)(5660300002)(55236004)(1006002)(1076003)(66476007)(110136005)(6486002)(66556008)(6666004)(110426006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?ha4xAf2U4XSU1/qXmGOwDstEYOnncS07EeL8uL0Kk2Zt/qS7l0Z42RxjOm1v?= =?us-ascii?Q?4b+HQdNx+09GfeUTucTElEeAFt7l/OD2MM8xlPmcZSAJoMF8X8W7YVx/JbqA?= =?us-ascii?Q?1QszdQtNGEbVaFp1ZPEaJZ2mR0lqkKRVEwXc1W8lPeRydjVT/KtClZnbY/p/?= =?us-ascii?Q?E2ca7d127aNmUGWos+bv1Vvr8pngAQ2B9c+1DDl0evXjouSl5GwyfYhTKWsx?= =?us-ascii?Q?bNRCNArdZoDMU+QxQeS90aRj8UPukz0JvKPFrMsH4zADDyP9u9RSqhpr1+Sj?= =?us-ascii?Q?Zs9MbSwXfWmuyflLbfkuigO52PFmFjd7+9LRhl111GVIb8CdvsTVTCRxMDz7?= =?us-ascii?Q?cwi85zJfVwDfV8UiU1OP41AjF2j15UQlX62qZVT/0Ag4x3RYwsK6kZjkX4Aq?= =?us-ascii?Q?YedfDEUjleBAzaNsMyynubWt9HGi3w66EXcsrQpee0axF1pa/BI0ZkLSQWlZ?= =?us-ascii?Q?Zw2qrq3bVGTZ85pnd3MtjpMVGMh9ZDWPHjcdMX/7tT6oajSHUYac2nNQ8/tw?= =?us-ascii?Q?1EdAonKMjgiSnCk+XBnI/j4kAzfpVhieYieJen/3c79jjnGCPTrRKj01lF2k?= =?us-ascii?Q?I8mC7NUa3iTIsXU7gLrpoh6tE/XudcGtEnucvy7V3/igjMdOlP3iZRPQ4kuh?= =?us-ascii?Q?adcAir5DRjF2AISLgPhue0w9OC/7lkYnlMDLoV6AH6iNrwXz9UclM2T65y9F?= =?us-ascii?Q?mdxVGvFX1+4SGuS9hTyI7+Y8SL/ax6ei9iJrde0TrPCQgoYdDazCfiZEqPql?= =?us-ascii?Q?/KbXJ5UPlPWPS6Etwk39K9cTowHL/SJbSkO41m5k+fmqtMlZq+IHl6gwW3Ak?= =?us-ascii?Q?giiZGA/C1KaC7STJpLM2Aetij46JefKHA+c499s1+pmLtq8pVYgTqlAhPiG9?= =?us-ascii?Q?sAzDr/R+2NsKPERegAKl8T6chhP1SM2w0ZD59/cgJoqh3KGdgK59sd8vJ92c?= =?us-ascii?Q?wt0bRoCmn4odHVFusw1P4/+8gcqdkG3O/Gz3+xx+W0hneh70ut+L9cdMbXNX?= =?us-ascii?Q?uobM?= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-AuthSource: AM0PR04MB5636.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Dec 2020 16:43:56.9276 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-Network-Message-Id: 79d14ee5-2895-4de3-18e1-08d8a1189db0 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: J9g1EplVuaoSWvLIybFPdpGLTbQsQ93bEGA+I8pifzjW1IMDZDtyt25hhOtYtwoyhEnJ2s/6SSyC6aZrENh4fg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6963 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Introduce ACPI mechanism to get PHYs registered on a MDIO bus and provide them to be connected to MAC. Describe properties "phy-handle" and "phy-mode". Signed-off-by: Calvin Johnson --- Changes in v2: - Updated with more description in document Documentation/firmware-guide/acpi/dsd/phy.rst | 129 ++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 Documentation/firmware-guide/acpi/dsd/phy.rst diff --git a/Documentation/firmware-guide/acpi/dsd/phy.rst b/Documentation/firmware-guide/acpi/dsd/phy.rst new file mode 100644 index 000000000000..a2e4fdcdbf53 --- /dev/null +++ b/Documentation/firmware-guide/acpi/dsd/phy.rst @@ -0,0 +1,129 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================= +MDIO bus and PHYs in ACPI +========================= + +The PHYs on an MDIO bus [1] are probed and registered using +fwnode_mdiobus_register_phy(). +Later, for connecting these PHYs to MAC, the PHYs registered on the +mdiobus have to be referenced. + +UUID given below should be used as mentioned in the "Device Properties +UUID For _DSD" [2] document. + - UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 + +This document introduces two _DSD properties that are to be used +for PHYs on the MDIO bus.[3] + +phy-handle +---------- +For each MAC node, a device property "phy-handle" is used to reference +the PHY that is registered on an MDIO bus. This is mandatory for +network interfaces that have PHYs connected to MAC via MDIO bus. + +During the MDIO bus driver initialization, PHYs on this bus are probed +using the _ADR object as shown below and are registered on the mdio bus. + +:: + Scope(\_SB.MDI0) + { + Device(PHY1) { + Name (_ADR, 0x1) + } // end of PHY1 + + Device(PHY2) { + Name (_ADR, 0x2) + } // end of PHY2 + } + +Later, during the MAC driver initialization, the registered PHY devices +have to be retrieved from the mdio bus. For this, MAC driver needs +reference to the previously registered PHYs which are provided +using reference to the device as {\_SB.MDI0.PHY1}. + +phy-mode +-------- +The "phy-mode" _DSD property is used to describe the connection to +the PHY. The valid values for "phy-mode" are defined in [4]. + + +An ASL example of this is shown below. + +DSDT entry for MDIO node +------------------------ +The MDIO bus has an SoC component(mdio controller) and a platform +component(PHYs on the mdiobus). + +a) Silicon Component +This node describes the MDIO controller,MDI0 +-------------------------------------------- +:: + Scope(_SB) + { + Device(MDI0) { + Name(_HID, "NXP0006") + Name(_CCA, 1) + Name(_UID, 0) + Name(_CRS, ResourceTemplate() { + Memory32Fixed(ReadWrite, MDI0_BASE, MDI_LEN) + Interrupt(ResourceConsumer, Level, ActiveHigh, Shared) + { + MDI0_IT + } + }) // end of _CRS for MDI0 + } // end of MDI0 + } + +b) Platform Component +This node defines the PHYs that are connected to the MDIO bus, MDI0 +------------------------------------------------------------------- +:: + Scope(\_SB.MDI0) + { + Device(PHY1) { + Name (_ADR, 0x1) + } // end of PHY1 + + Device(PHY2) { + Name (_ADR, 0x2) + } // end of PHY2 + } + + +Below are the MAC nodes where PHY nodes are referenced. +phy-mode and phy-handle are used as explained earlier. +------------------------------------------------------ +:: + Scope(\_SB.MCE0.PR17) + { + Name (_DSD, Package () { + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + Package () { + Package (2) {"phy-mode", "rgmii-id"}, + Package (2) {"phy-handle", \_SB.MDI0.PHY1} + } + }) + } + + Scope(\_SB.MCE0.PR18) + { + Name (_DSD, Package () { + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + Package () { + Package (2) {"phy-mode", "rgmii-id"}, + Package (2) {"phy-handle", \_SB.MDI0.PHY2}} + } + }) + } + +References +========== + +[1] Documentation/networking/phy.rst + +[2] https://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf + +[3] Documentation/firmware-guide/acpi/DSD-properties-rules.rst + +[4] Documentation/devicetree/bindings/net/ethernet-controller.yaml -- 2.17.1