From patchwork Fri Jun 11 10:53:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ioana Ciornei X-Patchwork-Id: 12315315 X-Patchwork-Delegate: kuba@kernel.org 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=-14.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,HK_RANDOM_FROM,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 2712BC48BE0 for ; Fri, 11 Jun 2021 10:56:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09328613CD for ; Fri, 11 Jun 2021 10:56:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231338AbhFKK6C (ORCPT ); Fri, 11 Jun 2021 06:58:02 -0400 Received: from mail-ed1-f47.google.com ([209.85.208.47]:41504 "EHLO mail-ed1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231704AbhFKK5h (ORCPT ); Fri, 11 Jun 2021 06:57:37 -0400 Received: by mail-ed1-f47.google.com with SMTP id g18so34603309edq.8; Fri, 11 Jun 2021 03:55:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=gbwVNa3S8li5NCVOh4mFUhXpgiQevg73Tb0jCktd9T4=; b=aUOrr0il8JxtyF4SJWqbAN+Yvnryyq3/lS1vMcJB8pA2R8zpVzedPXNMuQLn3JNqm2 dBXuypz/2GvMjzTpyZr/8/b8V+1X+DWF1LyzFlnVfe3BkeNOTRoMptKjmRhHe8oAehLp R1J4pIpV4aRh7jRi7GKzcJQQQGLbzty0wjjDMsTfgAhHZ/iKf/C1l5IawOBaOtLvBiUL q8PxoKpJ4D9SZZZ4SnhAQitzZMf1vw5NlNq1Ea/fQyviafjNOlqZiulV9aGcixB7FFDI L0YPPt2e9R3IHB4I4cHCY3oiuOB+BzBiSwRfIKF07OWXUQ3YzoY/o3frhIC/ncDnZ3FJ jisQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=gbwVNa3S8li5NCVOh4mFUhXpgiQevg73Tb0jCktd9T4=; b=O3NeWyZ8F3PpZGn41RBYeTCE9WukVS6H2f+rHV/qGSNLHClUcx9/JSYtK/4wr+r1D0 NsS4yj9d5IVvh3y+pXZjB9kVXmp4qEVOZCaSEyhy/JoQCJKGUmrXPCChA1jJGzjVO8EJ zsCXntH9UiOw5nW4XQgFy9dFWMytBmTkYcs3SGRjOceueF9pZuYUsowoJTe5W89B24O8 3ts00IuSiQ7cNzbpWf+bpvEdS7w9rOlKF+S5il696kb0eTpW8Ouht1ZR9dU/YvGx/o2h NjAc9m6CYuCdlWiwG5sRq1EuNclJ5JDps+3BpOlg7qmqoa8vihjFSNanHHL9uGLqrVEY eWoA== X-Gm-Message-State: AOAM532wKHegHfZtqAByzsQTphyEPgm2h7Vsd4kn+PkDXRJlwXnXSPX3 yAaIRAnQ9+MfJR7+0uxrqtk= X-Google-Smtp-Source: ABdhPJxIDJolZFi1bIHlyLHtY6oI64I2tnTaxEpyzIUhG0f81a9sJEc0/S9zrYtiGSfufK1XmJVOKw== X-Received: by 2002:a50:bf0f:: with SMTP id f15mr2954896edk.205.1623408878131; Fri, 11 Jun 2021 03:54:38 -0700 (PDT) Received: from yoga-910.localhost ([188.26.52.84]) by smtp.gmail.com with ESMTPSA id r19sm2492051eds.75.2021.06.11.03.54.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Jun 2021 03:54:37 -0700 (PDT) From: Ioana Ciornei To: davem@davemloft.net, kuba@kernel.org, hkallweit1@gmail.com, netdev@vger.kernel.org, Grant Likely , "Rafael J . Wysocki" , Jeremy Linton , Andrew Lunn , Andy Shevchenko , Florian Fainelli , Russell King - ARM Linux admin , Heikki Krogerus , Marcin Wojtas , Pieter Jansen Van Vuuren , Jon , Saravana Kannan , Randy Dunlap , calvin.johnson@oss.nxp.com Cc: Cristi Sovaiala , Florin Laurentiu Chiculita , Madalin Bucur , linux-arm-kernel@lists.infradead.org, Diana Madalina Craciun , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux.cj@gmail.com, Laurentiu Tudor , Len Brown , "Rafael J . Wysocki" , Ioana Ciornei Subject: [PATCH net-next v9 01/15] Documentation: ACPI: DSD: Document MDIO PHY Date: Fri, 11 Jun 2021 13:53:47 +0300 Message-Id: <20210611105401.270673-2-ciorneiioana@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210611105401.270673-1-ciorneiioana@gmail.com> References: <20210611105401.270673-1-ciorneiioana@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Calvin Johnson Introduce a mechanism based on generic ACPI _DSD device properties definition [1] to get PHYs registered on a MDIO bus and provide them to be connected to MAC. [1] http://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf Describe properties "phy-handle" and "phy-mode". Signed-off-by: Calvin Johnson Signed-off-by: Ioana Ciornei Acked-by: Rafael J. Wysocki Acked-by: Grant Likely --- Changes in v9: - Reworded the commit message Changes in v8: None 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