On Tue, Mar 2, 2021 at 5:36 PM Bin Meng bmeng.cn@gmail.com wrote:
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
doc/device-tree-bindings/net/fixed-link.txt | 47 +++++++++++++++------ 1 file changed, 35 insertions(+), 12 deletions(-)
diff --git a/doc/device-tree-bindings/net/fixed-link.txt b/doc/device-tree-bindings/net/fixed-link.txt index 5829bd81a2..71ab480701 100644 --- a/doc/device-tree-bindings/net/fixed-link.txt +++ b/doc/device-tree-bindings/net/fixed-link.txt @@ -5,21 +5,36 @@ 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:
-* '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.
+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
- '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 +43,11 @@ ethernet@0 { }; ... };
+The old binding:
+ethernet@0 {
...fixed-link = <0 1 1000 0 0>;...+};
2.25.1
Reviewed-By: Ramon Fried rfried.dev@gmail.com