Add an "external-facing" property to PCI ports in device-tree, to help identify untrusted devices. The notion of untrusted PCI devices was added to the v5.0 kernel to describe devices that should have strict IOMMU protection [1], for example devices that are plugged in a thunderbolt port. ACPI systems use the ExternalFacingPort property [2]. Add an equivalent mechanism to device tree. [1] https://lkml.org/lkml/2018/11/26/631 [2] https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports#identifying-externally-exposed-pcie-root-ports Jean-Philippe Brucker (2): dt-bindings: Add external-facing PCIe port property PCI: OF: Support external-facing property Documentation/devicetree/bindings/pci/pci.txt | 47 +++++++++++++++++++ drivers/pci/of.c | 3 ++ 2 files changed, 50 insertions(+) -- 2.21.0
