1* Microsemi - vsc8531 Giga bit ethernet phy 2 3Optional 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 38Table: 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 64Example: 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 }; 74