74 lines · plain
1* Microsemi - vsc8531 Giga bit ethernet phy2 3Optional properties:4- vsc8531,vddmac : The vddmac in mV. Allowed values is listed5 in the first row of Table 1 (below).6 This property is only used in combination7 with the 'edge-slowdown' property.8 Default value is 3300.9- vsc8531,edge-slowdown : % the edge should be slowed down relative to10 the fastest possible edge time.11 Edge rate sets the drive strength of the MAC12 interface output signals. Changing the13 drive strength will affect the edge rate of14 the output signal. The goal of this setting15 is to help reduce electrical emission (EMI)16 by being able to reprogram drive strength17 and in effect slow down the edge rate if18 desired.19 To adjust the edge-slowdown, the 'vddmac'20 must be specified. Table 1 lists the21 supported edge-slowdown values for a given22 '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 a27 PHY.28 Allowed values are defined in29 "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) and33 VSC8531_DUPLEX_COLLISION (8).34- load-save-gpios : GPIO used for the load/save operation of the PTP35 hardware clock (PHC).36 37 38Table: 1 - Edge rate change39----------------------------------------------------------------|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