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* Microsemi - vsc8531 Giga bit ethernet phy
Optional properties:
- vsc8531,vddmac : The vddmac in mV. Allowed values is listed
in the first row of Table 1 (below).
This property is only used in combination
with the 'edge-slowdown' property.
Default value is 3300.
- vsc8531,edge-slowdown : % the edge should be slowed down relative to
the fastest possible edge time.
Edge rate sets the drive strength of the MAC
interface output signals. Changing the
drive strength will affect the edge rate of
the output signal. The goal of this setting
is to help reduce electrical emission (EMI)
by being able to reprogram drive strength
and in effect slow down the edge rate if
desired.
To adjust the edge-slowdown, the 'vddmac'
must be specified. Table 1 lists the
supported edge-slowdown values for a given
'vddmac'.
Default value is 0%.
Ref: Table:1 - Edge rate change (below).
- vsc8531,led-[N]-mode : LED mode. Specify how the LED[N] should behave.
N depends on the number of LEDs supported by a
PHY.
Allowed values are defined in
"include/dt-bindings/net/mscc-phy-vsc8531.h".
Default values are VSC8531_LINK_1000_ACTIVITY (1),
VSC8531_LINK_100_ACTIVITY (2),
VSC8531_LINK_ACTIVITY (0) and
VSC8531_DUPLEX_COLLISION (8).
- load-save-gpios : GPIO used for the load/save operation of the PTP
hardware clock (PHC).
Table: 1 - Edge rate change
----------------------------------------------------------------|
| Edge Rate Change (VDDMAC) |
| |
| 3300 mV 2500 mV 1800 mV 1500 mV |
|---------------------------------------------------------------|
| 0% 0% 0% 0% |
| (Fastest) (recommended) (recommended) |
|---------------------------------------------------------------|
| 2% 3% 5% 6% |
|---------------------------------------------------------------|
| 4% 6% 9% 14% |
|---------------------------------------------------------------|
| 7% 10% 16% 21% |
|(recommended) (recommended) |
|---------------------------------------------------------------|
| 10% 14% 23% 29% |
|---------------------------------------------------------------|
| 17% 23% 35% 42% |
|---------------------------------------------------------------|
| 29% 37% 52% 58% |
|---------------------------------------------------------------|
| 53% 63% 76% 77% |
| (slowest) |
|---------------------------------------------------------------|
Example:
vsc8531_0: ethernet-phy@0 {
compatible = "ethernet-phy-id0007.0570";
vsc8531,vddmac = <3300>;
vsc8531,edge-slowdown = <7>;
vsc8531,led-0-mode = <LINK_1000_ACTIVITY>;
vsc8531,led-1-mode = <LINK_100_ACTIVITY>;
load-save-gpios = <&gpio 10 GPIO_ACTIVE_HIGH>;
};
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