123 lines
3.2 KiB
YAML
123 lines
3.2 KiB
YAML
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# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/net/mdio.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: MDIO Bus Generic Binding
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maintainers:
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- Andrew Lunn <andrew@lunn.ch>
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- Florian Fainelli <f.fainelli@gmail.com>
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- Heiner Kallweit <hkallweit1@gmail.com>
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description:
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These are generic properties that can apply to any MDIO bus. Any
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MDIO bus must have a list of child nodes, one per device on the
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bus. These should follow the generic ethernet-phy.yaml document, or
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a device specific binding document.
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properties:
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$nodename:
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pattern: "^mdio(@.*)?"
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"#address-cells":
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const: 1
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"#size-cells":
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const: 0
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reset-gpios:
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maxItems: 1
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description:
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The phandle and specifier for the GPIO that controls the RESET
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lines of all devices on that MDIO bus.
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reset-delay-us:
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description:
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RESET pulse width in microseconds. It applies to all MDIO devices
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and must therefore be appropriately determined based on all devices
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requirements (maximum value of all per-device RESET pulse widths).
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reset-post-delay-us:
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description:
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Delay after reset deassert in microseconds. It applies to all MDIO
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devices and it's determined by how fast all devices are ready for
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communication. This delay happens just before e.g. Ethernet PHY
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type ID auto detection.
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clock-frequency:
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description:
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Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3
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defined 2.5MHz should only be used when all devices on the bus support
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the given clock speed.
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suppress-preamble:
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description:
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The 32 bit preamble should be suppressed. In order for this to
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work, all devices on the bus must support suppressed preamble.
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type: boolean
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patternProperties:
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"^ethernet-phy@[0-9a-f]+$":
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type: object
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properties:
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reg:
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minimum: 0
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maximum: 31
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description:
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The ID number for the device.
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broken-turn-around:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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If set, indicates the MDIO device does not correctly release
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the turn around line low at end of the control phase of the
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MDIO transaction.
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resets:
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maxItems: 1
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reset-names:
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const: phy
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reset-gpios:
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maxItems: 1
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description:
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The GPIO phandle and specifier for the MDIO reset signal.
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reset-assert-us:
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description:
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Delay after the reset was asserted in microseconds. If this
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property is missing the delay will be skipped.
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reset-deassert-us:
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description:
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Delay after the reset was deasserted in microseconds. If
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this property is missing the delay will be skipped.
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required:
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- reg
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additionalProperties: true
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examples:
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- |
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davinci_mdio: mdio@5c030000 {
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reg = <0x5c030000 0x1000>;
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#address-cells = <1>;
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#size-cells = <0>;
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reset-gpios = <&gpio2 5 1>;
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reset-delay-us = <2>;
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ethphy0: ethernet-phy@1 {
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reg = <1>;
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};
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ethphy1: ethernet-phy@3 {
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reg = <3>;
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};
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};
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