diff --git a/include/jtag/part.h b/include/jtag/part.h
index 98b49ced..dda8917e 100644
--- a/include/jtag/part.h
+++ b/include/jtag/part.h
@@ -51,6 +51,7 @@ part *part_alloc( void );
 void part_free( part *p );
 part *read_part( FILE *f, const tap_register *idr );
 instruction *part_find_instruction( part *p, const char *iname );
+data_register *part_find_data_register( part *p, const char *drname );
 void part_set_signal( part *p, const char *pname, int out, int val );
 int part_get_signal( part *p, const char *pname );
 
diff --git a/jtag/src/part/part.c b/jtag/src/part/part.c
index e4755359..6c8b16e9 100644
--- a/jtag/src/part/part.c
+++ b/jtag/src/part/part.c
@@ -111,6 +111,24 @@ part_find_instruction( part *p, const char *iname )
 	return i;
 }
 
+data_register *
+part_find_data_register( part *p, const char *drname )
+{
+	data_register *dr;
+
+	if (!p || !drname)
+		return NULL;
+
+	dr = p->data_registers;
+	while (dr) {
+		if (strcmp( drname, dr->name ) == 0)
+			break;
+		dr = dr->next
+	}
+
+	return dr;
+}
+
 void
 part_set_signal( part *p, const char *pname, int out, int val )
 {