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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 , Saravana Kannan , Randy Dunlap Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-acpi@vger.kernel.org, Laurentiu Tudor , Diana Madalina Craciun , linux-arm-kernel@lists.infradead.org, linux.cj@gmail.com, Calvin Johnson , Len Brown , "Rafael J. Wysocki" Subject: [net-next PATCH v6 01/15] Documentation: ACPI: DSD: Document MDIO PHY Date: Thu, 18 Feb 2021 10:56:40 +0530 Message-Id: <20210218052654.28995-2-calvin.johnson@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210218052654.28995-1-calvin.johnson@oss.nxp.com> References: <20210218052654.28995-1-calvin.johnson@oss.nxp.com> X-Originating-IP: [14.142.151.118] X-ClientProxiedBy: SG2PR02CA0051.apcprd02.prod.outlook.com (2603:1096:4:54::15) 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 SG2PR02CA0051.apcprd02.prod.outlook.com (2603:1096:4:54::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3868.27 via Frontend Transport; Thu, 18 Feb 2021 05:27:26 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 9b0dfb8d-6112-4766-64ba-08d8d3cde402 X-MS-TrafficTypeDiagnostic: AM0PR0402MB3442: 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: 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 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)(346002)(136003)(39860400002)(376002)(396003)(44832011)(6486002)(26005)(7416002)(16526019)(110136005)(956004)(2616005)(186003)(55236004)(83380400001)(1076003)(6666004)(4326008)(316002)(1006002)(54906003)(8936002)(5660300002)(921005)(2906002)(52116002)(478600001)(86362001)(8676002)(6512007)(966005)(66946007)(6506007)(66476007)(66556008)(110426009);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9b0dfb8d-6112-4766-64ba-08d8d3cde402 X-MS-Exchange-CrossTenant-AuthSource: AM0PR04MB5636.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Feb 2021 05:27:32.4531 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: MW7WRwujPJKzoML86uDEFBrkQ9mNMRrYdOXYO33SxnitjkdwM+V57zzBn6yz9tuASLuhxCxcv40q4IUYNBvDJQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR0402MB3442 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@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 v6: - Minor cleanup Changes in v5: - More cleanup Changes in v4: - More cleanup Changes in v3: None Changes in v2: - Updated with more description in document Documentation/firmware-guide/acpi/dsd/phy.rst | 133 ++++++++++++++++++ 1 file changed, 133 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..7d01ae8b3cc6 --- /dev/null +++ b/Documentation/firmware-guide/acpi/dsd/phy.rst @@ -0,0 +1,133 @@ +.. 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 their respective MACs, the PHYs registered +on the MDIO bus have to be referenced. + +This document introduces two _DSD properties that are to be used +for connecting PHYs on the MDIO bus [3] to the MAC layer. + +These properties are defined in accordance with the "Device +Properties UUID For _DSD" [2] document and the +daffd814-6eba-4d8c-8a91-bc9bbf4aa301 UUID must be used in the Device +Data Descriptors containing them. + +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, the MAC driver needs +references to the previously registered PHYs which are provided +as device object references (e.g. \_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]. + +The following ASL example illustrates the usage of these properties. + +DSDT entry for MDIO node +------------------------ + +The MDIO bus has an SoC component (MDIO controller) and a platform +component (PHYs on the MDIO bus). + +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 +The PHY1 and PHY2 nodes represent the PHYs connected to MDIO bus MDI0 +--------------------------------------------------------------------- +:: + Scope(\_SB.MDI0) + { + Device(PHY1) { + Name (_ADR, 0x1) + } // end of PHY1 + + Device(PHY2) { + Name (_ADR, 0x2) + } // end of PHY2 + } + +DSDT entries representing MAC nodes +----------------------------------- + +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