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Date: Tue, 12 Jan 2021 19:10:40 +0530 From: Calvin Johnson <calvin.johnson@....nxp.com> To: Grant Likely <grant.likely@....com>, "Rafael J . Wysocki" <rafael@...nel.org>, Jeremy Linton <jeremy.linton@....com>, Andrew Lunn <andrew@...n.ch>, Andy Shevchenko <andy.shevchenko@...il.com>, Florian Fainelli <f.fainelli@...il.com>, Russell King - ARM Linux admin <linux@...linux.org.uk>, Cristi Sovaiala <cristian.sovaiala@....com>, Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>, Ioana Ciornei <ioana.ciornei@....com>, Madalin Bucur <madalin.bucur@....nxp.com>, Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Marcin Wojtas <mw@...ihalf.com>, Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>, Jon <jon@...id-run.com> Cc: Diana Madalina Craciun <diana.craciun@....com>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, Laurentiu Tudor <laurentiu.tudor@....com>, linux-acpi@...r.kernel.org, linux.cj@...il.com, linux-arm-kernel@...ts.infradead.org, Calvin Johnson <calvin.johnson@....nxp.com>, Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net> Subject: [net-next PATCH v3 01/15] Documentation: ACPI: DSD: Document MDIO PHY 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 <calvin.johnson@....nxp.com> --- Changes in v3: None 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
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