mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
1c196b308a
Per the upstream Linux kernel doc: Documentation/devicetree/bindings/net/ethernet-controller.yaml There are two ways to describe a fixed PHY attached to an Ethernet device. This updates our dt-bindings doc to add the old DT bindings. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
54 lines
1.6 KiB
Text
54 lines
1.6 KiB
Text
Fixed link Device Tree binding
|
|
------------------------------
|
|
|
|
Some Ethernet MACs have a "fixed link", and are not connected to a
|
|
normal MDIO-managed PHY device. For those situations, a Device Tree
|
|
binding allows to describe a "fixed link".
|
|
|
|
Note there are two ways to describe a fixed PHY attached to an
|
|
Ethernet device:
|
|
|
|
- The new DT binding, where 'fixed-link' is a sub-node of the Ethernet
|
|
MAC device node, with the following properties:
|
|
|
|
* 'speed' (integer, mandatory), to indicate the link speed. Accepted
|
|
values are 10, 100 and 1000
|
|
* 'full-duplex' (boolean, optional), to indicate that full duplex is
|
|
used. When absent, half duplex is assumed.
|
|
* 'pause' (boolean, optional), to indicate that pause should be
|
|
enabled.
|
|
* 'asym-pause' (boolean, optional), to indicate that asym_pause should
|
|
be enabled.
|
|
|
|
- The old DT binding, where 'fixed-link' is a property with 5 cells
|
|
encoding various information about the fixed PHY, in the form of
|
|
<phy_id, full-duplex, speed, pause, asym-pause>.
|
|
|
|
* 'phy_id', emulated PHY ID, choose any but unique to the all specified
|
|
fixed-links. Note U-Boot deliberately ignores the 'phy_id' and
|
|
unconditionally uses PHY_FIXED_ID.
|
|
* 'full-duplex', 0 for half duplex or 1 for full duplex
|
|
* 'speed', link speed in Mbits/sec, accepts only 10, 100 and 1000
|
|
* 'pause', 0 for no pause, 1 for pause
|
|
* 'asym-pause', 0 for no asymmetric pause, 1 for asymmetric pause
|
|
|
|
Examples:
|
|
|
|
The new binding:
|
|
|
|
ethernet@0 {
|
|
...
|
|
fixed-link {
|
|
speed = <1000>;
|
|
full-duplex;
|
|
};
|
|
...
|
|
};
|
|
|
|
The old binding:
|
|
|
|
ethernet@0 {
|
|
...
|
|
fixed-link = <0 1 1000 0 0>;
|
|
...
|
|
};
|