Add property enet-phy-pair-order to the device tree bindings to define
the pair order of the PHY. To simplify PCB design some manufacturers
allow to wire the pairs in a reverse order, and change the order in
software.

The property can be set to 0 to force the normal pair order (ABCD), or 1
to force the reverse pair order (DCBA).

Signed-off-by: Damien Dejean <dam.dejean@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
 Documentation/devicetree/bindings/net/ethernet-phy.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
index 58634fee9fc4..4a27547f7d7a 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
@@ -126,6 +126,12 @@ properties:
       e.g. wrong bootstrap configuration caused by issues in PCB
       layout design.
 
+  enet-phy-pair-order:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    description:
+      For normal (0) or reverse (1) order of the pairs (ABCD -> DCBA).
+
   eee-broken-100tx:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-- 
2.47.3