50 lines
1.4 KiB
Plaintext
50 lines
1.4 KiB
Plaintext
Micrel KSZ9021 Gigabit Ethernet PHY
|
|
|
|
Some boards require special tuning values, particularly when it comes to
|
|
clock delays. You can specify clock delay values by adding
|
|
micrel-specific properties to an Ethernet OF device node.
|
|
|
|
All skew control options are specified in picoseconds. The minimum
|
|
value is 0, and the maximum value is 3000.
|
|
|
|
Optional properties:
|
|
- rxc-skew-ps : Skew control of RXC pad
|
|
- rxdv-skew-ps : Skew control of RX CTL pad
|
|
- txc-skew-ps : Skew control of TXC pad
|
|
- txen-skew-ps : Skew control of TX_CTL pad
|
|
- rxd0-skew-ps : Skew control of RX data 0 pad
|
|
- rxd1-skew-ps : Skew control of RX data 1 pad
|
|
- rxd2-skew-ps : Skew control of RX data 2 pad
|
|
- rxd3-skew-ps : Skew control of RX data 3 pad
|
|
- txd0-skew-ps : Skew control of TX data 0 pad
|
|
- txd1-skew-ps : Skew control of TX data 1 pad
|
|
- txd2-skew-ps : Skew control of TX data 2 pad
|
|
- txd3-skew-ps : Skew control of TX data 3 pad
|
|
|
|
Examples:
|
|
|
|
/* Attach to an Ethernet device with autodetected PHY */
|
|
&enet {
|
|
rxc-skew-ps = <3000>;
|
|
rxdv-skew-ps = <0>;
|
|
txc-skew-ps = <3000>;
|
|
txen-skew-ps = <0>;
|
|
status = "okay";
|
|
};
|
|
|
|
/* Attach to an explicitly-specified PHY */
|
|
mdio {
|
|
phy0: ethernet-phy@0 {
|
|
rxc-skew-ps = <3000>;
|
|
rxdv-skew-ps = <0>;
|
|
txc-skew-ps = <3000>;
|
|
txen-skew-ps = <0>;
|
|
reg = <0>;
|
|
};
|
|
};
|
|
ethernet@70000 {
|
|
status = "okay";
|
|
phy = <&phy0>;
|
|
phy-mode = "rgmii-id";
|
|
};
|