# SPDX-License-Identifier: GPL-2.0 %YAML 1.2 --- $id: http://devicetree.org/schemas/net/mdio.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: MDIO Bus Common Properties maintainers: - Andrew Lunn - Florian Fainelli - Heiner Kallweit description: These are generic properties that can apply to any MDIO bus. Any MDIO bus must have a list of child nodes, one per device on the bus. These should follow the generic ethernet-phy.yaml document, or a device specific binding document. properties: $nodename: pattern: "^mdio(@.*)?" "#address-cells": const: 1 "#size-cells": const: 0 reset-gpios: maxItems: 1 description: The phandle and specifier for the GPIO that controls the RESET lines of all devices on that MDIO bus. reset-delay-us: description: RESET pulse width in microseconds. It applies to all MDIO devices and must therefore be appropriately determined based on all devices requirements (maximum value of all per-device RESET pulse widths). reset-post-delay-us: description: Delay after reset deassert in microseconds. It applies to all MDIO devices and it's determined by how fast all devices are ready for communication. This delay happens just before e.g. Ethernet PHY type ID auto detection. clock-frequency: description: Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3 defined 2.5MHz should only be used when all devices on the bus support the given clock speed. suppress-preamble: description: The 32 bit preamble should be suppressed. In order for this to work, all devices on the bus must support suppressed preamble. type: boolean patternProperties: '@[0-9a-f]+$': type: object properties: reg: minimum: 0 maximum: 31 description: The ID number for the device. broken-turn-around: $ref: /schemas/types.yaml#/definitions/flag description: If set, indicates the MDIO device does not correctly release the turn around line low at end of the control phase of the MDIO transaction. reset-gpios: maxItems: 1 description: The GPIO phandle and specifier for the MDIO reset signal. reset-assert-us: description: Delay after the reset was asserted in microseconds. If this property is missing the delay will be skipped. reset-deassert-us: description: Delay after the reset was deasserted in microseconds. If this property is missing the delay will be skipped. required: - reg additionalProperties: true examples: - | davinci_mdio: mdio@5c030000 { reg = <0x5c030000 0x1000>; #address-cells = <1>; #size-cells = <0>; reset-gpios = <&gpio2 5 1>; reset-delay-us = <2>; ethphy0: ethernet-phy@1 { reg = <1>; }; ethphy1: ethernet-phy@3 { reg = <3>; }; };