[PATCH net-next v11 01/16] dt-bindings: net: Introduce the ethernet-connector description

[Maxime Chevallier <maxime.chevallier@bootlin.com>]

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.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 .../bindings/net/ethernet-connector.yaml      | 45 +++++++++++++++++++
 .../devicetree/bindings/net/ethernet-phy.yaml | 18 ++++++++
 MAINTAINERS                                   |  1 +
 3 files changed, 64 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..32ae9f45b0e4
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/ethernet-connector.yaml
@@ -0,0 +1,45 @@
+# 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 Connector represents the output of a network component such as
+  a PHY, an Ethernet controller with no PHY, or an SFP module.
+
+properties:
+
+  lanes:
+    description:
+      Defines the number of lanes on the port, that is the number of physical
+      channels used to convey the data with the link partner.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  media:
+    description:
+      The mediums, as defined in 802.3, that can be used on the port.
+    enum:
+      - BaseT
+      - BaseK
+      - BaseS
+      - BaseC
+      - BaseL
+      - BaseD
+      - BaseE
+      - BaseF
+      - BaseV
+      - BaseMLD
+
+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..64bd23b7073d 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";
                 };
             };
+            /* Fast Ethernet port, with only 2 pairs wired */
+            mdi {
+                connector-0 {
+                    lanes = <2>;
+                    media = "BaseT";
+                };
+            };
         };
     };
diff --git a/MAINTAINERS b/MAINTAINERS
index bd62ad58a47f..1bee02451c4d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9094,6 +9094,7 @@ 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