From 641e674d6c0f974162c4c8cc0081c7ffc50b3911 Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Date: Tue, 26 Nov 2013 11:02:55 -0700
Subject: [PATCH] PCI: mvebu: Support a bridge with no IO port window

Make pcie-io-aperture and the IO port MBUS ID in ranges optional.  If not
provided the bridge reports to Linux that IO space mapping is not supported
and refuses to configure an IO MBUS window.

This allows both complete disable (do not specify pcie-io-aperture) and
per-port disable (do not specify a IO target ranges entry for the port).

Most PCIe devices these days do not require IO support to function, so
having an option to disable it in the driver is useful.

Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
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