| Hubert Chaumette | 4b405ef | 2014-05-06 09:40:16 +0200 | [diff] [blame] | 1 | Micrel KSZ9021/KSZ9031 Gigabit Ethernet PHY |
| 2 | |
| 3 | Some boards require special tuning values, particularly when it comes to |
| 4 | clock delays. You can specify clock delay values by adding |
| 5 | micrel-specific properties to an Ethernet OF device node. |
| 6 | |
| 7 | Note that these settings are applied after any phy-specific fixup from |
| 8 | phy_fixup_list (see phy_init_hw() from drivers/net/phy/phy_device.c), |
| 9 | and therefore may overwrite them. |
| 10 | |
| 11 | KSZ9021: |
| 12 | |
| 13 | All skew control options are specified in picoseconds. The minimum |
| 14 | value is 0, the maximum value is 3000, and it is incremented by 200ps |
| 15 | steps. |
| 16 | |
| 17 | Optional properties: |
| 18 | |
| 19 | - rxc-skew-ps : Skew control of RXC pad |
| 20 | - rxdv-skew-ps : Skew control of RX CTL pad |
| 21 | - txc-skew-ps : Skew control of TXC pad |
| 22 | - txen-skew-ps : Skew control of TX CTL pad |
| 23 | - rxd0-skew-ps : Skew control of RX data 0 pad |
| 24 | - rxd1-skew-ps : Skew control of RX data 1 pad |
| 25 | - rxd2-skew-ps : Skew control of RX data 2 pad |
| 26 | - rxd3-skew-ps : Skew control of RX data 3 pad |
| 27 | - txd0-skew-ps : Skew control of TX data 0 pad |
| 28 | - txd1-skew-ps : Skew control of TX data 1 pad |
| 29 | - txd2-skew-ps : Skew control of TX data 2 pad |
| 30 | - txd3-skew-ps : Skew control of TX data 3 pad |
| 31 | |
| 32 | KSZ9031: |
| 33 | |
| 34 | All skew control options are specified in picoseconds. The minimum |
| 35 | value is 0, and the maximum is property-dependent. The increment |
| 36 | step is 60ps. |
| 37 | |
| 38 | Optional properties: |
| 39 | |
| 40 | Maximum value of 1860: |
| 41 | |
| 42 | - rxc-skew-ps : Skew control of RX clock pad |
| 43 | - txc-skew-ps : Skew control of TX clock pad |
| 44 | |
| 45 | Maximum value of 900: |
| 46 | |
| 47 | - rxdv-skew-ps : Skew control of RX CTL pad |
| 48 | - txen-skew-ps : Skew control of TX CTL pad |
| 49 | - rxd0-skew-ps : Skew control of RX data 0 pad |
| 50 | - rxd1-skew-ps : Skew control of RX data 1 pad |
| 51 | - rxd2-skew-ps : Skew control of RX data 2 pad |
| 52 | - rxd3-skew-ps : Skew control of RX data 3 pad |
| 53 | - txd0-skew-ps : Skew control of TX data 0 pad |
| 54 | - txd1-skew-ps : Skew control of TX data 1 pad |
| 55 | - txd2-skew-ps : Skew control of TX data 2 pad |
| 56 | - txd3-skew-ps : Skew control of TX data 3 pad |
| 57 | |
| 58 | Examples: |
| 59 | |
| 60 | /* Attach to an Ethernet device with autodetected PHY */ |
| 61 | &enet { |
| 62 | rxc-skew-ps = <3000>; |
| 63 | rxdv-skew-ps = <0>; |
| 64 | txc-skew-ps = <3000>; |
| 65 | txen-skew-ps = <0>; |
| 66 | status = "okay"; |
| 67 | }; |
| 68 | |
| 69 | /* Attach to an explicitly-specified PHY */ |
| 70 | mdio { |
| 71 | phy0: ethernet-phy@0 { |
| 72 | rxc-skew-ps = <3000>; |
| 73 | rxdv-skew-ps = <0>; |
| 74 | txc-skew-ps = <3000>; |
| 75 | txen-skew-ps = <0>; |
| 76 | reg = <0>; |
| 77 | }; |
| 78 | }; |
| 79 | ethernet@70000 { |
| 80 | status = "okay"; |
| 81 | phy = <&phy0>; |
| 82 | phy-mode = "rgmii-id"; |
| 83 | }; |