Ethernet controllers may be connected to DPLL (Digital Phase Locked Loop)
pins for frequency synchronization purposes, such as in Synchronous
Ethernet (SyncE) configurations.

Add 'dpll-pins' and 'dpll-pin-names' properties to the generic
ethernet-controller schema. This allows describing the physical
connections between the Ethernet controller and the DPLL subsystem pins
in the Device Tree, enabling drivers to request and manage these
resources.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
 .../bindings/net/ethernet-controller.yaml           | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
index 1bafd687dcb18..03d91f786294e 100644
--- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
@@ -13,6 +13,19 @@ properties:
   $nodename:
     pattern: "^ethernet(@.*)?$"
 
+  dpll-pins:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      List of phandle to a DPLL pin node of the pins that are
+      connected with this ethernet controller.
+
+  dpll-pin-names:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description:
+      List of DPLL pin name strings in the same order as the dpll-pins,
+      with one name per pin. The dpll-pin-names can be used to match and
+      get a specific DPLL pin.
+
   label:
     description: Human readable label on a port of a box.
 
-- 
2.51.2