From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Date: Wed, 28 Jun 2017 15:13:58 -0500
Subject: PCI: altera: Convert PCI scan API to pci_scan_root_bus_bridge()

Git-commit: 9815791319a01be1ceca8b0b716219073b29a42d
Patch-mainline: v4.13-rc1
References: fate#326572

The introduction of pci_scan_root_bus_bridge() provides a PCI core API to
scan a PCI root bus backed by an already initialized struct pci_host_bridge
object, which simplifies the bus scan interface and makes the PCI scan root
bus interface easier to generalize as members are added to the struct
pci_host_bridge.

Convert PCI altera host code to pci_scan_root_bus_bridge() to improve the
PCI root bus scanning interface.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ley Foon Tan <lftan@altera.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/pci/host/pcie-altera.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index 75ec5cea26f6..7f023b286aaf 100644
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -579,12 +579,14 @@ static int altera_pcie_probe(struct platform_device *pdev)
 	struct altera_pcie *pcie;
 	struct pci_bus *bus;
 	struct pci_bus *child;
+	struct pci_host_bridge *bridge;
 	int ret;
 
-	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
-	if (!pcie)
+	bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
+	if (!bridge)
 		return -ENOMEM;
 
+	pcie = pci_host_bridge_priv(bridge);
 	pcie->pdev = pdev;
 
 	ret = altera_pcie_parse_dt(pcie);
@@ -613,12 +615,20 @@ static int altera_pcie_probe(struct platform_device *pdev)
 	cra_writel(pcie, P2A_INT_ENA_ALL, P2A_INT_ENABLE);
 	altera_pcie_host_init(pcie);
 
-	bus = pci_scan_root_bus(dev, pcie->root_bus_nr, &altera_pcie_ops,
-				pcie, &pcie->resources);
-	if (!bus)
-		return -ENOMEM;
+	list_splice_init(&pcie->resources, &bridge->windows);
+	bridge->dev.parent = dev;
+	bridge->sysdata = pcie;
+	bridge->busnr = pcie->root_bus_nr;
+	bridge->ops = &altera_pcie_ops;
+
+	ret = pci_scan_root_bus_bridge(bridge);
+	if (ret < 0)
+		return ret;
+
+	bus = bridge->bus;
 
 	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
+
 	pci_assign_unassigned_bus_resources(bus);
 
 	/* Configure PCI Express setting. */
-- 
2.11.0