55 lines
1.6 KiB
Plaintext
55 lines
1.6 KiB
Plaintext
Fixed link Device Tree binding
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------------------------------
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Some Ethernet MACs have a "fixed link", and are not connected to a
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normal MDIO-managed PHY device. For those situations, a Device Tree
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binding allows to describe a "fixed link".
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Such a fixed link situation is described by creating a 'fixed-link'
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sub-node of the Ethernet MAC device node, with the following
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properties:
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* 'speed' (integer, mandatory), to indicate the link speed. Accepted
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values are 10, 100 and 1000
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* 'full-duplex' (boolean, optional), to indicate that full duplex is
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used. When absent, half duplex is assumed.
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* 'pause' (boolean, optional), to indicate that pause should be
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enabled.
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* 'asym-pause' (boolean, optional), to indicate that asym_pause should
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be enabled.
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* 'link-gpios' ('gpio-list', optional), to indicate if a gpio can be read
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to determine if the link is up.
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Old, deprecated 'fixed-link' binding:
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* A 'fixed-link' property in the Ethernet MAC node, with 5 cells, of the
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form <a b c d e> with the following accepted values:
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- a: emulated PHY ID, choose any but but unique to the all specified
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fixed-links, from 0 to 31
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- b: duplex configuration: 0 for half duplex, 1 for full duplex
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- c: link speed in Mbits/sec, accepted values are: 10, 100 and 1000
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- d: pause configuration: 0 for no pause, 1 for pause
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- e: asymmetric pause configuration: 0 for no asymmetric pause, 1 for
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asymmetric pause
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Examples:
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ethernet@0 {
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...
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fixed-link {
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speed = <1000>;
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full-duplex;
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};
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...
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};
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ethernet@1 {
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...
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fixed-link {
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speed = <1000>;
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pause;
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link-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
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};
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...
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};
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