[net-next 3/4] dt-bindings: net: ftgmac100: add rgmii delay properties

[Jacky Chou <jacky_chou@xxxxxxxxxxxxxx>]

Add tx-internal-delay-ps and rx-internal-delay-ps to
configure the RGMII delay for MAC. According to
ethernet-controller.yaml, they use for RGMII TX and RX delay.

In Aspeed desgin, the RGMII delay is a number of ps as unit to
set delay, do not use one ps as unit. The values are different
from each MAC. So, here describes the property values
as index to configure corresponding scu register.

Signed-off-by: Jacky Chou <jacky_chou@xxxxxxxxxxxxxx>
---
 .../bindings/net/faraday,ftgmac100.yaml          | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
index 55d6a8379025..c5904aa84e05 100644
--- a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
+++ b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
@@ -66,6 +66,20 @@ properties:
     type: boolean
     deprecated: true
 
+  rx-internal-delay-ps:
+    description:
+       Setting this property to a non-zero number sets the RX internal delay
+       for the MAC. Use this property value as a index not a ps unit to
+       configure the corresponding delay register field. And the index range is
+       0 to 63.
+
+  tx-internal-delay-ps:
+    description:
+       Setting this property to a non-zero number sets the TX internal delay
+       for the MAC. Use this property value as a index not a ps unit to
+       configure the corresponding delay register field. And the index range is
+       0 to 63.
+
   mdio:
     $ref: /schemas/net/mdio.yaml#
 
@@ -102,4 +116,4 @@ examples:
                 reg = <1>;
             };
         };
-    };
+    };
\ No newline at end of file
-- 
2.34.1