* Microsemi - vsc8531 Giga bit ethernet phy 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-[N]-mode : LED mode. Specify how the LED[N] should behave. N depends on the number of LEDs supported by a PHY. Allowed values are defined in "include/dt-bindings/net/mscc-phy-vsc8531.h". Default values are VSC8531_LINK_1000_ACTIVITY (1), VSC8531_LINK_100_ACTIVITY (2), VSC8531_LINK_ACTIVITY (0) and VSC8531_DUPLEX_COLLISION (8). 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 = ; vsc8531,led-1-mode = ; };