ahb: lower hsel when idle to save power

src/main/scala/uncore/ahb/Bundles.scala

@@ -13,7 +13,7 @@ class AHBBundle(params: AHBBundleParameters) extends AHBBundleBase(params)
   // Flow control signals from the master
   val hmastlock = Bool(OUTPUT)
   val htrans    = UInt(OUTPUT, width = params.transBits)
-  val hsel      = Bool(OUTPUT) // on a master, drive this with true
+  val hsel      = Bool(OUTPUT)
   val hready    = Bool(OUTPUT) // on a master, drive this from readyout
 
   // Payload signals

src/main/scala/uncore/ahb/Protocol.scala

@@ -3,7 +3,6 @@
 package uncore.ahb
 
 import Chisel._
-import chisel3.util.{Irrevocable, IrrevocableIO}
 
 object AHBParameters
 {

src/main/scala/uncore/ahb/Xbar.scala

@@ -22,7 +22,7 @@ class AHBFanout()(implicit p: Parameters) extends LazyModule {
     }
 
     // Require consistent bus widths
-    val port0 = node.edgesIn(0).slave
+    val port0 = node.edgesOut(0).slave
     node.edgesOut.foreach { edge =>
       val port = edge.slave
       require (port.beatBytes == port0.beatBytes,