Re: [PATCH] PCI: generic: Add support for Cavium ThunderX PCIe root complexes.

From: David Daney <redacted>

The config space for external PCIe root complexes on some Cavium
ThunderX SoCs is very similar to CAM and ECAM, but differs in the
shift values that have to be applied to the bus and devfn numbers to
compose that address window offset.  These root complexes also have
the interesting property that there is no root bridge, so the standard
manner of limiting scanning to only the first device doesn't work.  We
can use the standard pci-host-generic driver if we make a minor
addition to handle these differences, so we...

Add a mapping function for ThunderX PCIe root complexes with a bus
shift of 24 and devfn shift of 16.  Ignore accesses for devices other
than the first device on the primary bus.

Document the whole thing in devicetree/bindings/pci/host-generic-pci.txt

Signed-off-by: David Daney <redacted>
---

This patch depends on the set I recently sent:
https://lkml.org/lkml/2015/9/11/764

 .../devicetree/bindings/pci/host-generic-pci.txt   |  5 +++-
 drivers/pci/host/pci-host-generic.c                | 29 ++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
index daa6942..51cc1d1 100644
--- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt
+++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt

@@ -16,7 +16,10 @@ Properties of the host controller node:
 
 - compatible     : Must be "pci-host-cam-generic" or "pci-host-ecam-generic"
                    depending on the layout of configuration space (CAM vs
-                   ECAM respectively).
+                   ECAM respectively). Also supported is
+                   "cavium,pci-host-thunder-pem" which has bus:devfn:reg in
+                   bits 24:16:0 respectively of the PCI config space address
+                   window.