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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-arm-kernel@lists.infradead.org, Diana Madalina Craciun , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux.cj@gmail.com, netdev@vger.kernel.org, Laurentiu Tudor , Calvin Johnson , Len Brown , "Rafael J. Wysocki" Subject: [net-next PATCH v7 01/16] Documentation: ACPI: DSD: Document MDIO PHY Date: Thu, 11 Mar 2021 11:49:56 +0530 Message-Id: <20210311062011.8054-2-calvin.johnson@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210311062011.8054-1-calvin.johnson@oss.nxp.com> References: <20210311062011.8054-1-calvin.johnson@oss.nxp.com> X-Originating-IP: [14.142.151.118] X-ClientProxiedBy: HKAPR03CA0026.apcprd03.prod.outlook.com (2603:1096:203:c9::13) 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 HKAPR03CA0026.apcprd03.prod.outlook.com (2603:1096:203:c9::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3955.9 via Frontend Transport; Thu, 11 Mar 2021 06:20:43 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 10f97422-76a9-4771-695c-08d8e455d1b5 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)(39860400002)(366004)(376002)(136003)(346002)(396003)(6512007)(2906002)(7416002)(8676002)(6486002)(2616005)(186003)(6506007)(86362001)(26005)(921005)(83380400001)(110136005)(16526019)(956004)(55236004)(316002)(66556008)(44832011)(66476007)(8936002)(1006002)(966005)(4326008)(1076003)(6666004)(66946007)(478600001)(52116002)(54906003)(5660300002)(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: 10f97422-76a9-4771-695c-08d8e455d1b5 X-MS-Exchange-CrossTenant-AuthSource: AM0PR04MB5636.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2021 06:20:51.8733 (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: cLMZZFdwEHYy9pGJdNyFOmqORSXI6oFGCpDYFJBNX0dpTM9ymE3VdgSBg2Zj+44M1YhYX9Rg/on7z0rDTA7fqQ== 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 v7: None 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