[PATCH RFC v2 01/11] dt-bindings: net: meson-dwmac: Add the amlogic,rx-delay-ns property

[Martin Blumenstingl]

The PRG_ETHERNET registers on Meson8b and newer SoCs can add an RX
delay. Add a property with the known supported values so it can be
configured according to the board layout.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
---
 .../bindings/net/amlogic,meson-dwmac.yaml           | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
index ae91aa9d8616..8d851f59d9f2 100644
--- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
@@ -67,6 +67,19 @@ allOf:
             PHY and MAC are adding a delay).
             Any configuration is ignored when the phy-mode is set to "rmii".
 
+        amlogic,rx-delay-ns:
+          $ref: /schemas/types.yaml#definitions/uint32
+          enum:
+            - 0
+            - 2
+          description:
+            The internal RGMII RX clock delay (provided by this IP block) in
+            nanoseconds. When phy-mode is set to "rgmii" then the RX delay
+            should be explicitly configured. When not configured a fallback of
+            0ns is used. When the phy-mode is set to either "rgmii-id" or
+            "rgmii-rxid" the RX clock delay is already provided by the PHY.
+            Any configuration is ignored when the phy-mode is set to "rmii".
+
 properties:
   compatible:
     additionalItems: true
-- 
2.26.2