[PATCH] arm64: Add architecture support for PCI

+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+#include <asm/pci-bridge.h>
+
+
+/*
+ * Return the domain number for this bus
+ */
+int pci_domain_nr(struct pci_bus *bus)
+{
+	struct pci_host_bridge *bridge = to_pci_host_bridge(bus->bridge);

Here bus is specific to root bus ? or, what about use find_pci_host_bridge() to get the pci_host_bridge
instead.

+
+	if (bridge)
+		return bridge->domain_nr;
+
+	return 0;
+}
+
+int pci_proc_domain(struct pci_bus *bus)
+{
+	return pci_domain_nr(bus);
+}
+
+/*
+ * Called after each bus is probed, but before its children are examined
+ */
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+	struct resource *res;
+	int i;
+
+	if (bus->self != NULL) {

What about use !pci_is_root_bus() ?

+		pci_read_bridge_bases(bus);
+
+		pci_bus_for_each_resource(bus, res, i) {
+			if (!res || !res->flags || res->parent)
+				continue;
+
+			/*
+			 * If we are going to reassign everything, we can
+			 * shrink the P2P resource to have zero size to
+			 * save space
+			 */
+			if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
+				res->flags |= IORESOURCE_UNSET;
+				res->start = 0;
+				res->end = -1;
+				continue;
+			}
+		}
+	}
+