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Documentation / devicetree / bindings / net / fixed-link.txt




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Based on kernel version 4.8. Page generated on 2016-10-06 23:13 EST.

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.
20	* 'link-gpios' ('gpio-list', optional), to indicate if a gpio can be read
21	  to determine if the link is up.
22	
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	
35	Examples:
36	
37	ethernet@0 {
38		...
39		fixed-link {
40		      speed = <1000>;
41		      full-duplex;
42		};
43		...
44	};
45	
46	ethernet@1 {
47		...
48		fixed-link {
49		      speed = <1000>;
50		      pause;
51		      link-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
52		};
53		...
54	};
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