The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/net/mscc-phy-vsc8531.txt

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    1 * Microsemi - vsc8531 Giga bit ethernet phy
    2 
    3 Optional properties:
    4 - vsc8531,vddmac        : The vddmac in mV. Allowed values is listed
    5                           in the first row of Table 1 (below).
    6                           This property is only used in combination
    7                           with the 'edge-slowdown' property.
    8                           Default value is 3300.
    9 - vsc8531,edge-slowdown : % the edge should be slowed down relative to
   10                           the fastest possible edge time.
   11                           Edge rate sets the drive strength of the MAC
   12                           interface output signals.  Changing the
   13                           drive strength will affect the edge rate of
   14                           the output signal.  The goal of this setting
   15                           is to help reduce electrical emission (EMI)
   16                           by being able to reprogram drive strength
   17                           and in effect slow down the edge rate if
   18                           desired.
   19                           To adjust the edge-slowdown, the 'vddmac'
   20                           must be specified. Table 1 lists the
   21                           supported edge-slowdown values for a given
   22                           'vddmac'.
   23                           Default value is 0%.
   24                           Ref: Table:1 - Edge rate change (below).
   25 - vsc8531,led-[N]-mode  : LED mode. Specify how the LED[N] should behave.
   26                           N depends on the number of LEDs supported by a
   27                           PHY.
   28                           Allowed values are defined in
   29                           "include/dt-bindings/net/mscc-phy-vsc8531.h".
   30                           Default values are VSC8531_LINK_1000_ACTIVITY (1),
   31                           VSC8531_LINK_100_ACTIVITY (2),
   32                           VSC8531_LINK_ACTIVITY (0) and
   33                           VSC8531_DUPLEX_COLLISION (8).
   34 - load-save-gpios       : GPIO used for the load/save operation of the PTP
   35                           hardware clock (PHC).
   36 
   37 
   38 Table: 1 - Edge rate change
   39 ----------------------------------------------------------------|
   40 |               Edge Rate Change (VDDMAC)                       |
   41 |                                                               |
   42 | 3300 mV       2500 mV         1800 mV         1500 mV         |
   43 |---------------------------------------------------------------|
   44 | 0%            0%              0%              0%              |
   45 | (Fastest)                     (recommended)   (recommended)   |
   46 |---------------------------------------------------------------|
   47 | 2%            3%              5%              6%              |
   48 |---------------------------------------------------------------|
   49 | 4%            6%              9%              14%             |
   50 |---------------------------------------------------------------|
   51 | 7%            10%             16%             21%             |
   52 |(recommended)  (recommended)                                   |
   53 |---------------------------------------------------------------|
   54 | 10%           14%             23%             29%             |
   55 |---------------------------------------------------------------|
   56 | 17%           23%             35%             42%             |
   57 |---------------------------------------------------------------|
   58 | 29%           37%             52%             58%             |
   59 |---------------------------------------------------------------|
   60 | 53%           63%             76%             77%             |
   61 | (slowest)                                                     |
   62 |---------------------------------------------------------------|
   63 
   64 Example:
   65 
   66         vsc8531_0: ethernet-phy@0 {
   67                 compatible = "ethernet-phy-id0007.0570";
   68                 vsc8531,vddmac          = <3300>;
   69                 vsc8531,edge-slowdown   = <7>;
   70                 vsc8531,led-0-mode      = <VSC8531_LINK_1000_ACTIVITY>;
   71                 vsc8531,led-1-mode      = <VSC8531_LINK_100_ACTIVITY>;
   72                 load-save-gpios         = <&gpio 10 GPIO_ACTIVE_HIGH>;
   73         };

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