+static bool mvpp2_use_acpi_compat_mode(struct fwnode_handle *port_fwnode)
+{
+	if (!is_acpi_node(port_fwnode))
+		return false;
+
+	return (!fwnode_property_present(port_fwnode, "phy-handle") &&
+		!fwnode_property_present(port_fwnode, "managed") &&
+		!fwnode_get_named_child_node(port_fwnode, "fixed-link"));

I'm not too sure about this last one. You only use fixed-link when
connecting to an Ethernet switch. I doubt anybody will try ACPI and a
switch. It has been agreed, ACPI is for simple hardware, and you need
to use DT for advanced hardware configurations.

What is your use case for fixed-link?

     Andrew