From 746ed77193c7fea31c823262bde0b244d1c68f99 Mon Sep 17 00:00:00 2001
From: James Cherry <cherry@parallaxsw.com>
Date: Sun, 26 Jul 2020 21:41:19 -0700
Subject: [PATCH] get_property liberty_port drive_resistance

---
 search/Property.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/search/Property.cc b/search/Property.cc
index f77e0889..d56a1447 100644
--- a/search/Property.cc
+++ b/search/Property.cc
@@ -36,6 +36,7 @@
 namespace sta {
 
 using std::string;
+using std::max;
 
 static PropertyValue
 pinSlewProperty(const Pin *pin,
@@ -690,6 +691,11 @@ getProperty(const LibertyPort *port,
   }
   else if (stringEqual(property, "is_register_clock"))
     return PropertyValue(port->isRegClk());
+  else if (stringEqual(property, "drive_resistance")) {
+    float drive = max(port->driveResistance(RiseFall::rise(), MinMax::max()),
+		      port->driveResistance(RiseFall::fall(), MinMax::max()));
+    return PropertyValue(drive);
+  }
   else if (stringEqual(property, "drive_resistance_rise_min"))
     return PropertyValue(port->driveResistance(RiseFall::rise(),
 					       MinMax::min()));