tilelink2: make TLRational have configurable direction

src/main/scala/uncore/tilelink2/Parameters.scala

@@ -5,6 +5,7 @@ package uncore.tilelink2
 import Chisel._
 import diplomacy._
 import scala.math.max
+import util.RationalDirection
 
 case class TLManagerParameters(
   address:            Seq[AddressSet],
@@ -326,6 +327,14 @@ case class TLAsyncEdgeParameters(client: TLAsyncClientPortParameters, manager: T
   val bundle = TLAsyncBundleParameters(manager.depth, TLBundleParameters(client.base, manager.base))
 }
 
+case class TLRationalManagerPortParameters(direction: RationalDirection, base: TLManagerPortParameters)
+case class TLRationalClientPortParameters(base: TLClientPortParameters)
+
+case class TLRationalEdgeParameters(client: TLRationalClientPortParameters, manager: TLRationalManagerPortParameters)
+{
+  val bundle = TLBundleParameters(client.base, manager.base)
+}
+
 object ManagerUnification
 {
   def apply(managers: Seq[TLManagerParameters]) = {