From 91ec6e0da8e0f566bce403e6c168f4b7e1f98e06 Mon Sep 17 00:00:00 2001
From: George Hilliard <thirtythreeforty@gmail.com>
Date: Wed, 15 Sep 2021 00:00:54 -0500
Subject: [PATCH] clock/lattice_ecp5/ECP5PLL: emit frequency annotations to
 help Diamond

Unlike nextpnr, Diamond appears not to infer the frequency of the
outputs.  Emit the same attributes that Diamond's PLL tool does.
---
 litex/soc/cores/clock/lattice_ecp5.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/litex/soc/cores/clock/lattice_ecp5.py b/litex/soc/cores/clock/lattice_ecp5.py
index 44a32ffb1..4b0f5c75e 100644
--- a/litex/soc/cores/clock/lattice_ecp5.py
+++ b/litex/soc/cores/clock/lattice_ecp5.py
@@ -162,4 +162,6 @@ class ECP5PLL(Module):
             self.params[f"p_CLKO{n_to_l[n]}_FPHASE"] = 0
             self.params[f"p_CLKO{n_to_l[n]}_CPHASE"] = cphase
             self.params[f"o_CLKO{n_to_l[n]}"]        = clk
+            if f > 0:  # i.e. not a feedback-only clock
+                self.params["attr"].append((f"FREQUENCY_PIN_CLKO{n_to_l[n]}", str(f/1e6)))
         self.specials += Instance("EHXPLLL", **self.params)