The ability to describe the physical ports of Ethernet devices is useful
to describe multi-port devices, as well as to remove any ambiguity with
regard to the nature of the port.

Moreover, describing ports allows for a better description of features
that are tied to connectors, such as PoE through the PSE-PD devices.

Introduce a binding to allow describing the ports, for now with 2
attributes :

 - The number of lanes, which is a quite generic property that allows
   differentating between multiple similar technologies such as BaseT1
   and "regular" BaseT (which usually means BaseT4).

 - The media that can be used on that port, such as BaseT for Twisted
   Copper, BaseC for coax copper, BaseS/L for Fiber, BaseK for backplane
   ethernet, etc. This allows defining the nature of the port, and
   therefore avoids the need for vendor-specific properties such as
   "micrel,fiber-mode" or "ti,fiber-mode".

The port description lives in its own file, as it is intended in the
future to allow describing the ports for phy-less devices.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 .../bindings/net/ethernet-connector.yaml      | 47 +++++++++++++++++++
 .../devicetree/bindings/net/ethernet-phy.yaml | 18 +++++++
 MAINTAINERS                                   |  1 +
 3 files changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/ethernet-connector.yaml

diff --git a/Documentation/devicetree/bindings/net/ethernet-connector.yaml b/Documentation/devicetree/bindings/net/ethernet-connector.yaml
new file mode 100644
index 000000000000..2aa28e6c1523
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/ethernet-connector.yaml

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/ethernet-connector.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic Ethernet Connector
+
+maintainers:
+  - Maxime Chevallier <maxime.chevallier@bootlin.com>
+
+description:
+  An Ethernet Connectr represents the output of a network component such as

+
+required:
+  - lanes
+  - media
+
+additionalProperties: true
+
+...

diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
index 71e2cd32580f..6bf670beb66f 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml

@@ -277,6 +277,17 @@ properties:
 
     additionalProperties: false
 
+  mdi:
+    type: object
+
+    patternProperties:
+      '^connector-[a-f0-9]+$':
+        $ref: /schemas/net/ethernet-connector.yaml#
+
+        unevaluatedProperties: false
+
+    additionalProperties: false
+
 required:
   - reg
 

@@ -313,5 +324,12 @@ examples:
                     default-state = "keep";
                 };
             };
+
+            mdi {
+              connector-0 {
+                lanes = <2>;
+                media = "BaseT";
+              };
+            };
         };
     };

diff --git a/MAINTAINERS b/MAINTAINERS
index bb9df569a3ff..20806cfc1003 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS

@@ -8946,6 +8946,7 @@ R:	Russell King <linux@armlinux.org.uk>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-class-net-phydev
+F:	Documentation/devicetree/bindings/net/ethernet-connector.yaml
 F:	Documentation/devicetree/bindings/net/ethernet-phy.yaml
 F:	Documentation/devicetree/bindings/net/mdio*
 F:	Documentation/devicetree/bindings/net/qca,ar803x.yaml

-- 
2.49.0