Commit | Line | Data |
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3be2a49e TP |
1 | Fixed link Device Tree binding |
2 | ------------------------------ | |
3 | ||
4 | Some Ethernet MACs have a "fixed link", and are not connected to a | |
5 | normal MDIO-managed PHY device. For those situations, a Device Tree | |
6 | binding allows to describe a "fixed link". | |
7 | ||
8 | Such a fixed link situation is described by creating a 'fixed-link' | |
9 | sub-node of the Ethernet MAC device node, with the following | |
10 | properties: | |
11 | ||
12 | * 'speed' (integer, mandatory), to indicate the link speed. Accepted | |
13 | values are 10, 100 and 1000 | |
14 | * 'full-duplex' (boolean, optional), to indicate that full duplex is | |
15 | used. When absent, half duplex is assumed. | |
16 | * 'pause' (boolean, optional), to indicate that pause should be | |
17 | enabled. | |
18 | * 'asym-pause' (boolean, optional), to indicate that asym_pause should | |
19 | be enabled. | |
a5597008 AL |
20 | * 'link-gpios' ('gpio-list', optional), to indicate if a gpio can be read |
21 | to determine if the link is up. | |
3be2a49e | 22 | |
91c1d980 FF |
23 | Old, deprecated 'fixed-link' binding: |
24 | ||
25 | * A 'fixed-link' property in the Ethernet MAC node, with 5 cells, of the | |
26 | form <a b c d e> with the following accepted values: | |
27 | - a: emulated PHY ID, choose any but but unique to the all specified | |
28 | fixed-links, from 0 to 31 | |
29 | - b: duplex configuration: 0 for half duplex, 1 for full duplex | |
30 | - c: link speed in Mbits/sec, accepted values are: 10, 100 and 1000 | |
31 | - d: pause configuration: 0 for no pause, 1 for pause | |
32 | - e: asymmetric pause configuration: 0 for no asymmetric pause, 1 for | |
33 | asymmetric pause | |
34 | ||
a5597008 | 35 | Examples: |
3be2a49e TP |
36 | |
37 | ethernet@0 { | |
38 | ... | |
39 | fixed-link { | |
40 | speed = <1000>; | |
41 | full-duplex; | |
42 | }; | |
43 | ... | |
44 | }; | |
a5597008 AL |
45 | |
46 | ethernet@1 { | |
47 | ... | |
48 | fixed-link { | |
49 | speed = <1000>; | |
50 | pause; | |
51 | link-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>; | |
52 | }; | |
53 | ... | |
54 | }; |