1 * APM X-Gene 15Gbps Multi-purpose PHY nodes
2
3 PHY nodes are defined to describe on-chip 15Gbps Multi-purpose PHY. Each
4 PHY (pair of lanes) has its own node.
5
6 Required properties:
7 - compatible : Shall be "apm,xgene-phy".
8 - reg : PHY memory resource is the SDS PHY access resource.
9 - #phy-cells : Shall be 1 as it expects one argument for setting
10 the mode of the PHY. Possible values are 0 (SATA),
11 1 (SGMII), 2 (PCIe), 3 (USB), and 4 (XFI).
12
13 Optional properties:
14 - status : Shall be "ok" if enabled or "disabled" if disabled.
15 Default is "ok".
16 - clocks : Reference to the clock entry.
17 - apm,tx-eye-tuning : Manual control to fine tune the capture of the serial
18 bit lines from the automatic calibrated position.
19 Two set of 3-tuple setting for each (up to 3)
20 supported link speed on the host. Range from 0 to
21 127 in unit of one bit period. Default is 10.
22 - apm,tx-eye-direction : Eye tuning manual control direction. 0 means sample
23 data earlier than the nominal sampling point. 1 means
24 sample data later than the nominal sampling point.
25 Two set of 3-tuple setting for each (up to 3)
26 supported link speed on the host. Default is 0.
27 - apm,tx-boost-gain : Frequency boost AC (LSB 3-bit) and DC (2-bit)
28 gain control. Two set of 3-tuple setting for each
29 (up to 3) supported link speed on the host. Range is
30 between 0 to 31 in unit of dB. Default is 3.
31 - apm,tx-amplitude : Amplitude control. Two set of 3-tuple setting for
32 each (up to 3) supported link speed on the host.
33 Range is between 0 to 199500 in unit of uV.
34 Default is 199500 uV.
35 - apm,tx-pre-cursor1 : 1st pre-cursor emphasis taps control. Two set of
36 3-tuple setting for each (up to 3) supported link
37 speed on the host. Range is 0 to 273000 in unit of
38 uV. Default is 0.
39 - apm,tx-pre-cursor2 : 2nd pre-cursor emphasis taps control. Two set of
40 3-tuple setting for each (up to 3) supported link
41 speed on the host. Range is 0 to 127400 in unit uV.
42 Default is 0x0.
43 - apm,tx-post-cursor : Post-cursor emphasis taps control. Two set of
44 3-tuple setting for Gen1, Gen2, and Gen3. Range is
45 between 0 to 0x1f in unit of 18.2mV. Default is 0xf.
46 - apm,tx-speed : Tx operating speed. One set of 3-tuple for each
47 supported link speed on the host.
48 0 = 1-2Gbps
49 1 = 2-4Gbps (1st tuple default)
50 2 = 4-8Gbps
51 3 = 8-15Gbps (2nd tuple default)
52 4 = 2.5-4Gbps
53 5 = 4-5Gbps
54 6 = 5-6Gbps
55 7 = 6-16Gbps (3rd tuple default)
56
57 NOTE: PHY override parameters are board specific setting.
58
59 Example:
60 phy1: phy@1f21a000 {
61 compatible = "apm,xgene-phy";
62 reg = <0x0 0x1f21a000 0x0 0x100>;
63 #phy-cells = <1>;
64 };
65
66 phy2: phy@1f22a000 {
67 compatible = "apm,xgene-phy";
68 reg = <0x0 0x1f22a000 0x0 0x100>;
69 #phy-cells = <1>;
70 };
71
72 phy3: phy@1f23a000 {
73 compatible = "apm,xgene-phy";
74 reg = <0x0 0x1f23a000 0x0 0x100>;
75 #phy-cells = <1>;
76 };
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