mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 21:02:19 +00:00
4b405efbe1
Renames micrel-ksz9021.txt to micrel-ksz90x1.txt and adds documentation for the KSZ9031 binding from patch 1. Also adds step increment information, and note about phy fixups. Signed-off-by: Hubert Chaumette <hchaumette@adeneo-embedded.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
2.5 KiB
Plaintext
84 lines
2.5 KiB
Plaintext
Micrel KSZ9021/KSZ9031 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.
|
|
|
|
Note that these settings are applied after any phy-specific fixup from
|
|
phy_fixup_list (see phy_init_hw() from drivers/net/phy/phy_device.c),
|
|
and therefore may overwrite them.
|
|
|
|
KSZ9021:
|
|
|
|
All skew control options are specified in picoseconds. The minimum
|
|
value is 0, the maximum value is 3000, and it is incremented by 200ps
|
|
steps.
|
|
|
|
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
|
|
|
|
KSZ9031:
|
|
|
|
All skew control options are specified in picoseconds. The minimum
|
|
value is 0, and the maximum is property-dependent. The increment
|
|
step is 60ps.
|
|
|
|
Optional properties:
|
|
|
|
Maximum value of 1860:
|
|
|
|
- rxc-skew-ps : Skew control of RX clock pad
|
|
- txc-skew-ps : Skew control of TX clock pad
|
|
|
|
Maximum value of 900:
|
|
|
|
- rxdv-skew-ps : Skew control of RX CTL 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";
|
|
};
|