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# 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 Generic Binding
maintainers:
- Andrew Lunn <andrew@lunn.ch>
- Florian Fainelli <f.fainelli@gmail.com>
- Heiner Kallweit <hkallweit1@gmail.com>
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:
$nodename:
pattern: "^mdio(@.*)?"
"#address-cells":
const: 1
"#size-cells":
const: 0
reset-gpios:
maxItems: 1
description:
The phandle and specifier for the GPIO that controls the RESET
lines of all devices on that MDIO bus.
reset-delay-us:
description:
RESET pulse width in microseconds. It applies to all MDIO devices
and must therefore be appropriately determined based on all devices
requirements (maximum value of all per-device RESET pulse widths).
clock-frequency:
description:
Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3
defined 2.5MHz should only be used when all devices on the bus support
the given clock speed.
suppress-preamble:
description:
The 32 bit preamble should be suppressed. In order for this to
work, all devices on the bus must support suppressed preamble.
type: boolean
patternProperties:
"^ethernet-phy@[0-9a-f]+$":
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.
resets:
maxItems: 1
reset-names:
const: phy
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
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>;
};
};
|
