From 85bb108ba40f9573571de0a785f9fbc91c4e1dd0 Mon Sep 17 00:00:00 2001
From: gatecat <gatecat@ds0.me>
Date: Wed, 10 Feb 2021 11:54:54 +0000
Subject: Add getBelPinsForCellPin to Arch API

This is a basic implementation, without considering "M of N"
arrangements (e.g. for LUT permuation where you only want to route to 1
out of 4/6 sinks) or using a type other than IdString to identify bel
pins.

But this is also enough to start working out where in nextpnr will break
due to removing the 1:1 cell:bel pin cardinality, as a next step.

Signed-off-by: gatecat <gatecat@ds0.me>
---
 fpga_interchange/arch.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'fpga_interchange/arch.h')

diff --git a/fpga_interchange/arch.h b/fpga_interchange/arch.h
index fd2d16a2..e5c7551b 100644
--- a/fpga_interchange/arch.h
+++ b/fpga_interchange/arch.h
@@ -660,6 +660,7 @@ struct ArchRanges
     using TileBelsRangeT = BelRange;
     using BelAttrsRangeT = std::vector<std::pair<IdString, std::string>>;
     using BelPinsRangeT = IdStringRange;
+    using CellBelPinRangeT = std::array<IdString, 1>;
     // Wires
     using AllWiresRangeT = WireRange;
     using DownhillPipRangeT = DownhillPipRange;
@@ -866,6 +867,8 @@ struct Arch : ArchAPI<ArchRanges>
         return str_range;
     }
 
+    std::array<IdString, 1> getBelPinsForCellPin(CellInfo *cell_info, IdString pin) const override { return {pin}; }
+
     // -------------------------------------------------
 
     WireId getWireByName(IdStringList name) const override;
-- 
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