1 * Microsemi - vsc8531 Giga bit ethernet phy 1 * Microsemi - vsc8531 Giga bit ethernet phy
2 2
3 Optional properties: 3 Optional properties:
4 - vsc8531,vddmac : The vddmac in mV. Al 4 - vsc8531,vddmac : The vddmac in mV. Allowed values is listed
5 in the first row of 5 in the first row of Table 1 (below).
6 This property is onl 6 This property is only used in combination
7 with the 'edge-slowd 7 with the 'edge-slowdown' property.
8 Default value is 330 8 Default value is 3300.
9 - vsc8531,edge-slowdown : % the edge should be 9 - vsc8531,edge-slowdown : % the edge should be slowed down relative to
10 the fastest possible 10 the fastest possible edge time.
11 Edge rate sets the d 11 Edge rate sets the drive strength of the MAC
12 interface output sig 12 interface output signals. Changing the
13 drive strength will 13 drive strength will affect the edge rate of
14 the output signal. 14 the output signal. The goal of this setting
15 is to help reduce el 15 is to help reduce electrical emission (EMI)
16 by being able to rep 16 by being able to reprogram drive strength
17 and in effect slow d 17 and in effect slow down the edge rate if
18 desired. 18 desired.
19 To adjust the edge-s 19 To adjust the edge-slowdown, the 'vddmac'
20 must be specified. T 20 must be specified. Table 1 lists the
21 supported edge-slowd 21 supported edge-slowdown values for a given
22 'vddmac'. 22 'vddmac'.
23 Default value is 0%. 23 Default value is 0%.
24 Ref: Table:1 - Edge 24 Ref: Table:1 - Edge rate change (below).
25 - vsc8531,led-[N]-mode : LED mode. Specify ho 25 - vsc8531,led-[N]-mode : LED mode. Specify how the LED[N] should behave.
26 N depends on the num 26 N depends on the number of LEDs supported by a
27 PHY. 27 PHY.
28 Allowed values are d 28 Allowed values are defined in
29 "include/dt-bindings 29 "include/dt-bindings/net/mscc-phy-vsc8531.h".
30 Default values are V 30 Default values are VSC8531_LINK_1000_ACTIVITY (1),
31 VSC8531_LINK_100_ACT 31 VSC8531_LINK_100_ACTIVITY (2),
32 VSC8531_LINK_ACTIVIT 32 VSC8531_LINK_ACTIVITY (0) and
33 VSC8531_DUPLEX_COLLI 33 VSC8531_DUPLEX_COLLISION (8).
34 - load-save-gpios : GPIO used for the lo <<
35 hardware clock (PHC) <<
36 34
37 35
38 Table: 1 - Edge rate change 36 Table: 1 - Edge rate change
39 ---------------------------------------------- 37 ----------------------------------------------------------------|
40 | Edge Rate Change (VDDMAC) 38 | Edge Rate Change (VDDMAC) |
41 | 39 | |
42 | 3300 mV 2500 mV 1800 mV 40 | 3300 mV 2500 mV 1800 mV 1500 mV |
43 |--------------------------------------------- 41 |---------------------------------------------------------------|
44 | 0% 0% 0% 42 | 0% 0% 0% 0% |
45 | (Fastest) (recommended) 43 | (Fastest) (recommended) (recommended) |
46 |--------------------------------------------- 44 |---------------------------------------------------------------|
47 | 2% 3% 5% 45 | 2% 3% 5% 6% |
48 |--------------------------------------------- 46 |---------------------------------------------------------------|
49 | 4% 6% 9% 47 | 4% 6% 9% 14% |
50 |--------------------------------------------- 48 |---------------------------------------------------------------|
51 | 7% 10% 16% 49 | 7% 10% 16% 21% |
52 |(recommended) (recommended) 50 |(recommended) (recommended) |
53 |--------------------------------------------- 51 |---------------------------------------------------------------|
54 | 10% 14% 23% 52 | 10% 14% 23% 29% |
55 |--------------------------------------------- 53 |---------------------------------------------------------------|
56 | 17% 23% 35% 54 | 17% 23% 35% 42% |
57 |--------------------------------------------- 55 |---------------------------------------------------------------|
58 | 29% 37% 52% 56 | 29% 37% 52% 58% |
59 |--------------------------------------------- 57 |---------------------------------------------------------------|
60 | 53% 63% 76% 58 | 53% 63% 76% 77% |
61 | (slowest) 59 | (slowest) |
62 |--------------------------------------------- 60 |---------------------------------------------------------------|
63 61
64 Example: 62 Example:
65 63
66 vsc8531_0: ethernet-phy@0 { 64 vsc8531_0: ethernet-phy@0 {
67 compatible = "ethernet-phy-id0 65 compatible = "ethernet-phy-id0007.0570";
68 vsc8531,vddmac = <330 66 vsc8531,vddmac = <3300>;
69 vsc8531,edge-slowdown = <7>; 67 vsc8531,edge-slowdown = <7>;
70 vsc8531,led-0-mode = <VSC !! 68 vsc8531,led-0-mode = <LINK_1000_ACTIVITY>;
71 vsc8531,led-1-mode = <VSC !! 69 vsc8531,led-1-mode = <LINK_100_ACTIVITY>;
72 load-save-gpios = <&gp <<
73 }; 70 };
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