tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
7title: MDIO Bus Generic Binding
8
9maintainers:
10 - Andrew Lunn <andrew@lunn.ch>
11 - Florian Fainelli <f.fainelli@gmail.com>
12 - Heiner Kallweit <hkallweit1@gmail.com>
13
14description:
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
20properties:
21 $nodename:
22 pattern: "^mdio(@.*)?"
23
24 "#address-cells":
25 const: 1
26
27 "#size-cells":
28 const: 0
29
30 reset-gpios:
31 maxItems: 1
32 description:
33 The phandle and specifier for the GPIO that controls the RESET
34 lines of all devices on that MDIO bus.
35
36 reset-delay-us:
37 description:
38 RESET pulse width in microseconds. It applies to all MDIO devices
39 and must therefore be appropriately determined based on all devices
40 requirements (maximum value of all per-device RESET pulse widths).
41
42 reset-post-delay-us:
43 description:
44 Delay after reset deassert in microseconds. It applies to all MDIO
45 devices and it's determined by how fast all devices are ready for
46 communication. This delay happens just before e.g. Ethernet PHY
47 type ID auto detection.
48
49 clock-frequency:
50 description:
51 Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3
52 defined 2.5MHz should only be used when all devices on the bus support
53 the given clock speed.
54
55 suppress-preamble:
56 description:
57 The 32 bit preamble should be suppressed. In order for this to
58 work, all devices on the bus must support suppressed preamble.
59 type: boolean
60
61patternProperties:
62 "^ethernet-phy@[0-9a-f]+$":
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 resets:
80 maxItems: 1
81
82 reset-names:
83 const: phy
84
85 reset-gpios:
86 maxItems: 1
87 description:
88 The GPIO phandle and specifier for the MDIO reset signal.
89
90 reset-assert-us:
91 description:
92 Delay after the reset was asserted in microseconds. If this
93 property is missing the delay will be skipped.
94
95 reset-deassert-us:
96 description:
97 Delay after the reset was deasserted in microseconds. If
98 this property is missing the delay will be skipped.
99
100 required:
101 - reg
102
103examples:
104 - |
105 davinci_mdio: mdio@5c030000 {
106 reg = <0x5c030000 0x1000>;
107 #address-cells = <1>;
108 #size-cells = <0>;
109
110 reset-gpios = <&gpio2 5 1>;
111 reset-delay-us = <2>;
112
113 ethphy0: ethernet-phy@1 {
114 reg = <1>;
115 };
116
117 ethphy1: ethernet-phy@3 {
118 reg = <3>;
119 };
120 };