From 596bccc6e57c6c57df1d99d4af300d6a2e722ed9 Mon Sep 17 00:00:00 2001
From: gatecat <gatecat@ds0.me>
Date: Thu, 22 Apr 2021 10:28:10 +0100
Subject: Allow macro expansions conditional on parameter match

Signed-off-by: gatecat <gatecat@ds0.me>
---
 interchange/DeviceResources.capnp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/interchange/DeviceResources.capnp b/interchange/DeviceResources.capnp
index 5a52bec..465e212 100644
--- a/interchange/DeviceResources.capnp
+++ b/interchange/DeviceResources.capnp
@@ -242,6 +242,14 @@ struct Device {
   struct PrimToMacroExpansion {
     primName  @0 : StringIdx $stringRef();
     macroName @1 : StringIdx $stringRef();
+    # Optionally, primitive to macro expansions can be conditional on a
+    # parameter match. For example, I/O buffer expansions might be 
+    # different between true and pseudo differential IO types. The
+    # expansion is used if **any** of the parameters specified match.
+    union {
+      always     @2 : Void;
+      parameters @3 : List(Dir.Netlist.PropertyMap.Entry);
+    }
   }
 
   # Cell <-> BEL and Cell pin <-> BEL Pin mapping
-- 
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