diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
index cbece6e9bff27..c6eb0b70dd3f0 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -234,8 +234,7 @@ static int sparx5_create_targets(struct sparx5 *sparx5)
 		}
 		iomem[idx] = devm_ioremap(sparx5->dev,
 					  iores[idx]->start,
-					  iores[idx]->end - iores[idx]->start
-					  + 1);
+					  resource_size(iores[idx]));
 		if (!iomem[idx]) {
 			dev_err(sparx5->dev, "Unable to get switch registers: %s\n",
 				iores[idx]->name);