1 * Microsemi - vsc8531 Giga bit ethernet phy
2
3 Optional properties:
4 - vsc8531,vddmac : The vddmac in mV. Allowed values is listed
5 in the first row of Table 1 (below).
6 This property is only used in combination
7 with the 'edge-slowdown' property.
8 Default value is 3300.
9 - vsc8531,edge-slowdown : % the edge should be slowed down relative to
10 the fastest possible edge time.
11 Edge rate sets the drive strength of the MAC
12 interface output signals. Changing the
13 drive strength will affect the edge rate of
14 the output signal. The goal of this setting
15 is to help reduce electrical emission (EMI)
16 by being able to reprogram drive strength
17 and in effect slow down the edge rate if
18 desired.
19 To adjust the edge-slowdown, the 'vddmac'
20 must be specified. Table 1 lists the
21 supported edge-slowdown values for a given
22 'vddmac'.
23 Default value is 0%.
24 Ref: Table:1 - Edge rate change (below).
25 - vsc8531,led-[N]-mode : LED mode. Specify how the LED[N] should behave.
26 N depends on the number of LEDs supported by a
27 PHY.
28 Allowed values are defined in
29 "include/dt-bindings/net/mscc-phy-vsc8531.h".
30 Default values are VSC8531_LINK_1000_ACTIVITY (1),
31 VSC8531_LINK_100_ACTIVITY (2),
32 VSC8531_LINK_ACTIVITY (0) and
33 VSC8531_DUPLEX_COLLISION (8).
34 - load-save-gpios : GPIO used for the load/save operation of the PTP
35 hardware clock (PHC).
36
37
38 Table: 1 - Edge rate change
39 ----------------------------------------------------------------|
40 | Edge Rate Change (VDDMAC) |
41 | |
42 | 3300 mV 2500 mV 1800 mV 1500 mV |
43 |---------------------------------------------------------------|
44 | 0% 0% 0% 0% |
45 | (Fastest) (recommended) (recommended) |
46 |---------------------------------------------------------------|
47 | 2% 3% 5% 6% |
48 |---------------------------------------------------------------|
49 | 4% 6% 9% 14% |
50 |---------------------------------------------------------------|
51 | 7% 10% 16% 21% |
52 |(recommended) (recommended) |
53 |---------------------------------------------------------------|
54 | 10% 14% 23% 29% |
55 |---------------------------------------------------------------|
56 | 17% 23% 35% 42% |
57 |---------------------------------------------------------------|
58 | 29% 37% 52% 58% |
59 |---------------------------------------------------------------|
60 | 53% 63% 76% 77% |
61 | (slowest) |
62 |---------------------------------------------------------------|
63
64 Example:
65
66 vsc8531_0: ethernet-phy@0 {
67 compatible = "ethernet-phy-id0007.0570";
68 vsc8531,vddmac = <3300>;
69 vsc8531,edge-slowdown = <7>;
70 vsc8531,led-0-mode = <VSC8531_LINK_1000_ACTIVITY>;
71 vsc8531,led-1-mode = <VSC8531_LINK_100_ACTIVITY>;
72 load-save-gpios = <&gpio 10 GPIO_ACTIVE_HIGH>;
73 };
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