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dt-bindings: net: Add the old DT bindings for "fixed-link"

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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>
This commit is contained in:
Bin Meng 2021-03-14 20:14:45 +08:00 committed by Priyanka Jain
parent 017af7f71a
commit 1c196b308a
1 changed files with 35 additions and 11 deletions
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46
doc/device-tree-bindings/net/fixed-link.txt
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@ -5,21 +5,37 @@ 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".
Such a fixed link situation is described by creating a 'fixed-link'
sub-node of the Ethernet MAC device node, with the following
properties:
Note there are two ways to describe a fixed PHY attached to an
Ethernet device:
* '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 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 {
@ -28,3 +44,11 @@ ethernet@0 {
};
...
};
The old binding:
ethernet@0 {
...
fixed-link = <0 1 1000 0 0>;
...
};