84 lines
2.5 KiB
Plaintext
84 lines
2.5 KiB
Plaintext
Micrel KSZ9021/KSZ9031 Gigabit Ethernet PHY
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Some boards require special tuning values, particularly when it comes to
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clock delays. You can specify clock delay values by adding
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micrel-specific properties to an Ethernet OF device node.
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Note that these settings are applied after any phy-specific fixup from
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phy_fixup_list (see phy_init_hw() from drivers/net/phy/phy_device.c),
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and therefore may overwrite them.
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KSZ9021:
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All skew control options are specified in picoseconds. The minimum
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value is 0, the maximum value is 3000, and it is incremented by 200ps
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steps.
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Optional properties:
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- rxc-skew-ps : Skew control of RXC pad
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- rxdv-skew-ps : Skew control of RX CTL pad
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- txc-skew-ps : Skew control of TXC pad
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- txen-skew-ps : Skew control of TX CTL pad
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- rxd0-skew-ps : Skew control of RX data 0 pad
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- rxd1-skew-ps : Skew control of RX data 1 pad
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- rxd2-skew-ps : Skew control of RX data 2 pad
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- rxd3-skew-ps : Skew control of RX data 3 pad
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- txd0-skew-ps : Skew control of TX data 0 pad
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- txd1-skew-ps : Skew control of TX data 1 pad
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- txd2-skew-ps : Skew control of TX data 2 pad
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- txd3-skew-ps : Skew control of TX data 3 pad
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KSZ9031:
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All skew control options are specified in picoseconds. The minimum
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value is 0, and the maximum is property-dependent. The increment
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step is 60ps.
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Optional properties:
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Maximum value of 1860:
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- rxc-skew-ps : Skew control of RX clock pad
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- txc-skew-ps : Skew control of TX clock pad
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Maximum value of 900:
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- rxdv-skew-ps : Skew control of RX CTL pad
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- txen-skew-ps : Skew control of TX CTL pad
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- rxd0-skew-ps : Skew control of RX data 0 pad
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- rxd1-skew-ps : Skew control of RX data 1 pad
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- rxd2-skew-ps : Skew control of RX data 2 pad
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- rxd3-skew-ps : Skew control of RX data 3 pad
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- txd0-skew-ps : Skew control of TX data 0 pad
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- txd1-skew-ps : Skew control of TX data 1 pad
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- txd2-skew-ps : Skew control of TX data 2 pad
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- txd3-skew-ps : Skew control of TX data 3 pad
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Examples:
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/* Attach to an Ethernet device with autodetected PHY */
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&enet {
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rxc-skew-ps = <3000>;
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rxdv-skew-ps = <0>;
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txc-skew-ps = <3000>;
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txen-skew-ps = <0>;
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status = "okay";
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};
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/* Attach to an explicitly-specified PHY */
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mdio {
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phy0: ethernet-phy@0 {
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rxc-skew-ps = <3000>;
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rxdv-skew-ps = <0>;
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txc-skew-ps = <3000>;
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txen-skew-ps = <0>;
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reg = <0>;
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};
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};
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ethernet@70000 {
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status = "okay";
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phy = <&phy0>;
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phy-mode = "rgmii-id";
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};
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