Kernel-4.18.0-80.el8_mscc-phy-vsc8531

• Microsemi - vsc8531 Giga bit ethernet phy

Required properties:

• compatible : Should contain phy id as “ethernet-phy-idAAAA.BBBB”

      The PHY device uses the binding described in
      Documentation/devicetree/bindings/net/phy.txt
  

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-0-mode : LED mode. Specify how the LED[0] should behave.

          Allowed values are define in
          "include/dt-bindings/net/mscc-phy-vsc8531.h".
          Default value is VSC8531_LINK_1000_ACTIVITY (1).
  

• vsc8531,led-1-mode : LED mode. Specify how the LED[1] should behave.

          Allowed values are define in
          "include/dt-bindings/net/mscc-phy-vsc8531.h".
          Default value is VSC8531_LINK_100_ACTIVITY (2).
  

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>;
    };