soc/interconnect/csr/CSRConstant: Add constant attribute.

litex/soc/interconnect/csr.py

@@ -63,13 +63,14 @@ class CSRConstant(DUID):
         DUID.__init__(self)
         self.value    = Constant(value, bits_sign)
         self.name     = get_obj_var_name(name)
+        self.constant = value
         if self.name is None:
             raise ValueError("Cannot extract CSR name from code, need to specify.")
 
     def read(self):
         """Read method for simulation."""
         yield
-        return self.value.value
+        return self.constant
 
 # CSR ----------------------------------------------------------------------------------------------