dt-binding: net: ti: am65x-cpts: add 'ti,pps' property

Add the ti,pps property used to indicate the pair of HWx_TS_PUSH input and
the TS_GENFy output.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/ti,k3-am654-cpts.yaml

@@ -93,6 +93,14 @@ properties:
     description:
       Number of timestamp Generator function outputs (TS_GENFx)
 
+  ti,pps:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 2
+    maxItems: 2
+    description: |
+      The pair of HWx_TS_PUSH input and TS_GENFy output indexes used for
+      PPS events generation. Platform/board specific.
+
   refclk-mux:
     type: object
     additionalProperties: false