From dcedc4e6a5c3e19b2cb231e4e478c31413f148b6 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sat, 1 Nov 2014 21:48:02 +0800
Subject: [PATCH] actorlib/structuring/Pipeline: make 'busy' a signal

---
 migen/actorlib/structuring.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/migen/actorlib/structuring.py b/migen/actorlib/structuring.py
index 24199aca5..ce465578b 100644
--- a/migen/actorlib/structuring.py
+++ b/migen/actorlib/structuring.py
@@ -199,14 +199,13 @@ class Converter(Module):
 
 class Pipeline(Module):
 	def __init__(self, *modules):
+		self.busy = Signal()
 		n = len(modules)
 		m = modules[0]
 		# expose sink of first module
 		# if available
 		if hasattr(m, "sink"):
 			self.sink = m.sink
-		# use of busy is encouraged
-		# but not mandatory
 		if hasattr(m, "busy"):
 			busy = m.busy
 		else:
@@ -224,4 +223,4 @@ class Pipeline(Module):
 		# if available
 		if hasattr(m, "source"):
 			self.source = m.source
-		self.busy = busy
+		self.comb += self.busy.eq(busy)