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db40c1aa1c
This patch adds support for having a "fixed-link" to some other MAC (like some embedded switch-device). For this purpose we introduce a new phy-driver, called "Fixed PHY". Fixed PHY works only with CONFIG_DM_ETH enabled, since the fixed-link is described with a subnode below ethernet interface. Most ethernet drivers (unfortunately not all are following same scheme for searching/attaching phys) are calling "phy_connect(...)" for getting a phy-device. At this point we link in, we search here for a subnode called "fixed- link", once found we start phy_device_create(...) with the special phy- id PHY_FIXED_ID (0xa5a55a5a). During init the "Fixed PHY" driver has registered with this id and now gets probed, during probe we get all the details about fixed-link out of dts, later on the phy reports this values. Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com> Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at> Acked-by: Joe Hershberger <joe.hershberger@ni.com> Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
31 lines
856 B
Plaintext
31 lines
856 B
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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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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