gen/fhdl/namer: Cleanup & add comments on Namespace.

litex/gen/fhdl/namer.py

@@ -237,18 +237,30 @@ class Namespace:
         self.clock_domains = dict()
 
     def get_name(self, sig):
+        # Clock Signal.
+        # -------------
         if isinstance(sig, ClockSignal):
             sig = self.clock_domains[sig.cd].clk
+
+        # Reset Signal.
+        # -------------
         if isinstance(sig, ResetSignal):
             sig = self.clock_domains[sig.cd].rst
             if sig is None:
-                raise ValueError("Attempted to obtain name of non-existent "
-                                 "reset signal of domain "+sig.cd)
+                msg = f"Clock Domain {sig.cd} is reset-less, can't obtain name"
+                raise ValueError(msg)
 
+        # Regular Signal.
+        # ---------------
+        # Use Name's override when set...
         if sig.name_override is not None:
             sig_name = sig.name_override
+        # ... else get Name from pnd.
         else:
             sig_name = self.pnd[sig]
+
+        # Check/Add numbering suffix when required.
+        # -----------------------------------------
         try:
             n = self.sigs[sig]
         except KeyError:
@@ -258,7 +270,7 @@ class Namespace:
                 n = 0
             self.sigs[sig]        = n
             self.counts[sig_name] = n + 1
-        if n:
-            return sig_name + "_" + str(n)
-        else:
-            return sig_name
+        suffix = "" if n == 0 else f"_{n}"
+
+        # Return Name.
+        return sig_name + suffix