cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

mscc-phy-vsc8531.txt (2884B)

      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        };