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