TLBuffer: Create a wrapper module for TLBufferChain, to allow for more stable naming

src/main/scala/tilelink/Bus.scala

@@ -67,17 +67,10 @@ abstract class TLBusWrapper(params: TLBusParams, val busName: String)(implicit p
   protected def inwardNode: TLInwardNode = xbar.node
   protected def inwardBufNode: TLInwardNode = master_buffer.node
 
-  protected def bufferChain(depth: Int, params: BufferParams = BufferParams.default, name: Option[String] = None): (TLInwardNode, TLOutwardNode) = {
-    if (depth > 0) {
-      val chain = List.fill(depth)(LazyModule(new TLBuffer(params)))
-      name.foreach { n => chain.zipWithIndex foreach { case(b, i) => b.suggestName(s"${busName}_${n}_${i}_TLBuffer") } }
-      (chain.init zip chain.tail) foreach { case(prev, next) => next.node :=* prev.node }
-      (chain.head.node, chain.last.node)
-    } else {
-      val dummy = LazyModule(new TLBuffer(BufferParams.none))
-      name.foreach { n => dummy.suggestName(s"${busName}_${n}_empty_TLBuffer")}
-      (dummy.node, dummy.node)
-    }
+  protected def bufferChain(depth: Int, name: Option[String] = None): (TLInwardNode, TLOutwardNode) = {
+    val chain = LazyModule(new TLBufferChain(depth))
+    name.foreach { n => chain.suggestName(s"${busName}_${n}_TLBufferChain")}
+    (chain.nodeIn, chain.nodeOut)
   }
 
   def bufferFromMasters: TLInwardNode = inwardBufNode