| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/net/mdio.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: MDIO Bus Common Properties |
| 8 | |
| 9 | maintainers: |
| 10 | - Andrew Lunn <andrew@lunn.ch> |
| 11 | - Florian Fainelli <f.fainelli@gmail.com> |
| 12 | - Heiner Kallweit <hkallweit1@gmail.com> |
| 13 | |
| 14 | description: |
| 15 | These are generic properties that can apply to any MDIO bus. Any |
| 16 | MDIO bus must have a list of child nodes, one per device on the |
| 17 | bus. These should follow the generic ethernet-phy.yaml document, or |
| 18 | a device specific binding document. |
| 19 | |
| 20 | properties: |
| 21 | $nodename: |
| 22 | pattern: "^mdio(@.*)?" |
| 23 | |
| 24 | "#address-cells": |
| 25 | const: 1 |
| 26 | |
| 27 | "#size-cells": |
| 28 | const: 0 |
| 29 | |
| 30 | reset-gpios: |
| 31 | maxItems: 1 |
| 32 | description: |
| 33 | The phandle and specifier for the GPIO that controls the RESET |
| 34 | lines of all devices on that MDIO bus. |
| 35 | |
| 36 | reset-delay-us: |
| 37 | description: |
| 38 | RESET pulse width in microseconds. It applies to all MDIO devices |
| 39 | and must therefore be appropriately determined based on all devices |
| 40 | requirements (maximum value of all per-device RESET pulse widths). |
| 41 | |
| 42 | reset-post-delay-us: |
| 43 | description: |
| 44 | Delay after reset deassert in microseconds. It applies to all MDIO |
| 45 | devices and it's determined by how fast all devices are ready for |
| 46 | communication. This delay happens just before e.g. Ethernet PHY |
| 47 | type ID auto detection. |
| 48 | |
| 49 | clock-frequency: |
| 50 | description: |
| 51 | Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3 |
| 52 | defined 2.5MHz should only be used when all devices on the bus support |
| 53 | the given clock speed. |
| 54 | |
| 55 | suppress-preamble: |
| 56 | description: |
| 57 | The 32 bit preamble should be suppressed. In order for this to |
| 58 | work, all devices on the bus must support suppressed preamble. |
| 59 | type: boolean |
| 60 | |
| 61 | patternProperties: |
| 62 | '@[0-9a-f]+$': |
| 63 | type: object |
| 64 | |
| 65 | properties: |
| 66 | reg: |
| 67 | minimum: 0 |
| 68 | maximum: 31 |
| 69 | description: |
| 70 | The ID number for the device. |
| 71 | |
| 72 | broken-turn-around: |
| 73 | $ref: /schemas/types.yaml#/definitions/flag |
| 74 | description: |
| 75 | If set, indicates the MDIO device does not correctly release |
| 76 | the turn around line low at end of the control phase of the |
| 77 | MDIO transaction. |
| 78 | |
| 79 | reset-gpios: |
| 80 | maxItems: 1 |
| 81 | description: |
| 82 | The GPIO phandle and specifier for the MDIO reset signal. |
| 83 | |
| 84 | reset-assert-us: |
| 85 | description: |
| 86 | Delay after the reset was asserted in microseconds. If this |
| 87 | property is missing the delay will be skipped. |
| 88 | |
| 89 | reset-deassert-us: |
| 90 | description: |
| 91 | Delay after the reset was deasserted in microseconds. If |
| 92 | this property is missing the delay will be skipped. |
| 93 | |
| 94 | required: |
| 95 | - reg |
| 96 | |
| 97 | additionalProperties: true |
| 98 | |
| 99 | examples: |
| 100 | - | |
| 101 | davinci_mdio: mdio@5c030000 { |
| 102 | reg = <0x5c030000 0x1000>; |
| 103 | #address-cells = <1>; |
| 104 | #size-cells = <0>; |
| 105 | |
| 106 | reset-gpios = <&gpio2 5 1>; |
| 107 | reset-delay-us = <2>; |
| 108 | |
| 109 | ethphy0: ethernet-phy@1 { |
| 110 | reg = <1>; |
| 111 | }; |
| 112 | |
| 113 | ethphy1: ethernet-phy@3 { |
| 114 | reg = <3>; |
| 115 | }; |
| 116 | }; |