1* Microsemi - vsc8531 Giga bit ethernet phy
2
3Required properties:
4- compatible	: Should contain phy id as "ethernet-phy-idAAAA.BBBB"
5		  The PHY device uses the binding described in
6		  Documentation/devicetree/bindings/net/phy.txt
7
8Optional properties:
9- vsc8531,vddmac	: The vddmac in mV.
10- vsc8531,edge-slowdown	: % the edge should be slowed down relative to
11			  the fastest possible edge time. Native sign
12			  need not enter.
13			  Edge rate sets the drive strength of the MAC
14			  interface output signals.  Changing the drive
15			  strength will affect the edge rate of the output
16			  signal.  The goal of this setting is to help
17			  reduce electrical emission (EMI) by being able
18			  to reprogram drive strength and in effect slow
19			  down the edge rate if desired.  Table 1 shows the
20			  impact to the edge rate per VDDMAC supply for each
21			  drive strength setting.
22			  Ref: Table:1 - Edge rate change below.
23
24Note: see dt-bindings/net/mscc-phy-vsc8531.h for applicable values
25
26Table: 1 - Edge rate change
27----------------------------------------------------------------|
28| 		Edge Rate Change (VDDMAC)			|
29|								|
30| 3300 mV	2500 mV		1800 mV		1500 mV		|
31|---------------------------------------------------------------|
32| Default	Deafult		Default		Default		|
33| (Fastest)			(recommended)	(recommended)	|
34|---------------------------------------------------------------|
35| -2%		-3%		-5%		-6%		|
36|---------------------------------------------------------------|
37| -4%		-6%		-9%		-14%		|
38|---------------------------------------------------------------|
39| -7%		-10%		-16%		-21%		|
40|(recommended)	(recommended)					|
41|---------------------------------------------------------------|
42| -10%		-14%		-23%		-29%		|
43|---------------------------------------------------------------|
44| -17%		-23%		-35%		-42%		|
45|---------------------------------------------------------------|
46| -29%		-37%		-52%		-58%		|
47|---------------------------------------------------------------|
48| -53%		-63%		-76%		-77%		|
49| (slowest)							|
50|---------------------------------------------------------------|
51
52Example:
53
54        vsc8531_0: ethernet-phy@0 {
55                compatible = "ethernet-phy-id0007.0570";
56                vsc8531,vddmac		= <3300>;
57                vsc8531,edge-slowdown	= <21>;
58        };
59