From 5a063abaa1152dbd842889cd2d414b314cf3327d Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 30 Mar 2018 10:10:00 +0100
Subject: [PATCH] check pin position overwriting

---
 src/spec/interfaces.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/spec/interfaces.py b/src/spec/interfaces.py
index b47545d..194cf90 100644
--- a/src/spec/interfaces.py
+++ b/src/spec/interfaces.py
@@ -32,6 +32,10 @@ class Pinouts(object):
         if pinidx not in self.pins:
             self.pins[pinidx] = v
         else:
+            for k in v:
+                assert k not in self.pins[pinidx], \
+                    "pin %d position %d already taken\n%s\n%s" % \
+                        (pinidx, k, str(v), self.pins[pinidx])
             self.pins[pinidx].update(v)
 
     def keys(self):
-- 
2.30.2