build/generic_platform, generic_toolchain, yosys_nextpnr_wrapper: introduce the information about ability to do synthesis with mixed languages

litex/build/generic_platform.py

@@ -323,6 +323,7 @@ class ConstraintManager:
 
 class GenericPlatform:
     def __init__(self, device, io, connectors=[], name=None):
+        self.toolchain          = None
         self.device             = device
         self.constraint_manager = ConstraintManager(io, connectors)
         if name is None:
@@ -462,3 +463,7 @@ class GenericPlatform:
 
     def create_programmer(self):
         raise NotImplementedError
+
+    @property
+    def support_mixed_language(self):
+        return self.toolchain.support_mixed_language

litex/build/generic_toolchain.py

@@ -18,6 +18,7 @@ class GenericToolchain:
     }
 
     supported_build_backend = ["litex"]
+    _support_mixed_language  = True
 
     def __init__(self):
         self.clocks      = dict()
@@ -27,6 +28,10 @@ class GenericToolchain:
         self._vns        = None
         self._synth_opts = ""
 
+    @property
+    def support_mixed_language(self):
+        return self._support_mixed_language
+
     def finalize(self):
         pass # Pass since optional.
 

litex/build/yosys_nextpnr_toolchain.py

@@ -57,10 +57,13 @@ class YosysNextPNRToolchain(GenericToolchain):
         target package  (optional/target dependant)
     _speed_grade: str
         target speed grade (optional/target dependant)
+    _support_mixed_language: bool
+        informs if toolchain is able to use only verilog or verilog + vhdl
     """
     attr_translate = {
         "keep": ("keep", "true"),
     }
+    _support_mixed_language  = False
 
     family     = ""
     synth_fmt  = ""