1 # SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause)
2 # Copyright (C) 2019 Texas Instruments Incorporated
3 %YAML 1.2
4 ---
5 $id: http://devicetree.org/schemas/net/ti,dp83867.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
7
8 title: TI DP83867 ethernet PHY
9
10 allOf:
11 - $ref: ethernet-controller.yaml#
12
13 maintainers:
14 - Andrew Davis <afd@ti.com>
15
16 description: |
17 The DP83867 device is a robust, low power, fully featured Physical Layer
18 transceiver with integrated PMD sublayers to support 10BASE-Te, 100BASE-TX
19 and 1000BASE-T Ethernet protocols.
20
21 The DP83867 is designed for easy implementation of 10/100/1000 Mbps Ethernet
22 LANs. It interfaces directly to twisted pair media via an external
23 transformer. This device interfaces directly to the MAC layer through the
24 IEEE 802.3 Standard Media Independent Interface (MII), the IEEE 802.3 Gigabit
25 Media Independent Interface (GMII) or Reduced GMII (RGMII).
26
27 Specifications about the Ethernet PHY can be found at:
28 https://www.ti.com/lit/gpn/dp83867ir
29
30 properties:
31 reg:
32 maxItems: 1
33
34 nvmem-cells:
35 maxItems: 1
36 description:
37 Nvmem data cell containing the value to write to the
38 IO_IMPEDANCE_CTRL field of the IO_MUX_CFG register.
39
40 nvmem-cell-names:
41 items:
42 - const: io_impedance_ctrl
43
44 ti,min-output-impedance:
45 type: boolean
46 description: |
47 MAC Interface Impedance control to set the programmable output impedance
48 to a minimum value (35 ohms).
49
50 ti,max-output-impedance:
51 type: boolean
52 description: |
53 MAC Interface Impedance control to set the programmable output impedance
54 to a maximum value (70 ohms).
55 Note: Specifying an io_impedance_ctrl nvmem cell or one of the
56 ti,min-output-impedance, ti,max-output-impedance properties
57 are mutually exclusive. If more than one is present, an nvmem
58 cell takes precedence over ti,max-output-impedance, which in
59 turn takes precedence over ti,min-output-impedance.
60
61 tx-fifo-depth:
62 $ref: /schemas/types.yaml#/definitions/uint32
63 description: |
64 Transmitt FIFO depth see dt-bindings/net/ti-dp83867.h for values
65
66 rx-fifo-depth:
67 $ref: /schemas/types.yaml#/definitions/uint32
68 description: |
69 Receive FIFO depth see dt-bindings/net/ti-dp83867.h for values
70
71 ti,clk-output-sel:
72 $ref: /schemas/types.yaml#/definitions/uint32
73 description: |
74 Muxing option for CLK_OUT pin. See dt-bindings/net/ti-dp83867.h
75 for applicable values. The CLK_OUT pin can also be disabled by this
76 property. When omitted, the PHY's default will be left as is.
77
78 ti,rx-internal-delay:
79 $ref: /schemas/types.yaml#/definitions/uint32
80 description: |
81 RGMII Receive Clock Delay - see dt-bindings/net/ti-dp83867.h
82 for applicable values. Required only if interface type is
83 PHY_INTERFACE_MODE_RGMII_ID or PHY_INTERFACE_MODE_RGMII_RXID.
84
85 ti,tx-internal-delay:
86 $ref: /schemas/types.yaml#/definitions/uint32
87 description: |
88 RGMII Transmit Clock Delay - see dt-bindings/net/ti-dp83867.h
89 for applicable values. Required only if interface type is
90 PHY_INTERFACE_MODE_RGMII_ID or PHY_INTERFACE_MODE_RGMII_TXID.
91
92 Note: If the interface type is PHY_INTERFACE_MODE_RGMII the TX/RX clock
93 delays will be left at their default values, as set by the PHY's pin
94 strapping. The default strapping will use a delay of 2.00 ns. Thus
95 PHY_INTERFACE_MODE_RGMII, by default, does not behave as RGMII with no
96 internal delay, but as PHY_INTERFACE_MODE_RGMII_ID. The device tree
97 should use "rgmii-id" if internal delays are desired as this may be
98 changed in future to cause "rgmii" mode to disable delays.
99
100 ti,dp83867-rxctrl-strap-quirk:
101 type: boolean
102 description: |
103 This denotes the fact that the board has RX_DV/RX_CTRL pin strapped in
104 mode 1 or 2. To ensure PHY operation, there are specific actions that
105 software needs to take when this pin is strapped in these modes.
106 See data manual for details.
107
108 ti,sgmii-ref-clock-output-enable:
109 type: boolean
110 description: |
111 This denotes which SGMII configuration is used (4 or 6-wire modes).
112 Some MACs work with differential SGMII clock. See data manual for details.
113
114 ti,fifo-depth:
115 deprecated: true
116 $ref: /schemas/types.yaml#/definitions/uint32
117 description: |
118 Transmitt FIFO depth- see dt-bindings/net/ti-dp83867.h for applicable
119 values.
120
121 required:
122 - reg
123
124 unevaluatedProperties: false
125
126 examples:
127 - |
128 #include <dt-bindings/net/ti-dp83867.h>
129 mdio0 {
130 #address-cells = <1>;
131 #size-cells = <0>;
132 ethphy0: ethernet-phy@0 {
133 reg = <0>;
134 tx-fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
135 rx-fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
136 ti,max-output-impedance;
137 ti,clk-output-sel = <DP83867_CLK_O_SEL_CHN_A_RCLK>;
138 ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_25_NS>;
139 ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_75_NS>;
140 };
141 };
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