PCI: mediatek: Convert to use pci_host_probe()

Part of mtk_pcie_register_host() is an open-coded version of
pci_host_probe(). So instead of duplicating this code, use
pci_host_probe() directly and remove mtk_pcie_register_host().

Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
[lorenzo.pieralisi@arm.com: commit log changes]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Ryder Lee <ryder.lee@mediatek.com>

drivers/pci/controller/pcie-mediatek.c

@@ -1121,34 +1121,6 @@ static int mtk_pcie_request_resources(struct mtk_pcie *pcie)
 	return 0;
 }
 
-static int mtk_pcie_register_host(struct pci_host_bridge *host)
-{
-	struct mtk_pcie *pcie = pci_host_bridge_priv(host);
-	struct pci_bus *child;
-	int err;
-
-	host->busnr = pcie->busn.start;
-	host->dev.parent = pcie->dev;
-	host->ops = pcie->soc->ops;
-	host->map_irq = of_irq_parse_and_map_pci;
-	host->swizzle_irq = pci_common_swizzle;
-	host->sysdata = pcie;
-
-	err = pci_scan_root_bus_bridge(host);
-	if (err < 0)
-		return err;
-
-	pci_bus_size_bridges(host->bus);
-	pci_bus_assign_resources(host->bus);
-
-	list_for_each_entry(child, &host->bus->children, node)
-		pcie_bus_configure_settings(child);
-
-	pci_bus_add_devices(host->bus);
-
-	return 0;
-}
-
 static int mtk_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1175,7 +1147,14 @@ static int mtk_pcie_probe(struct platform_device *pdev)
 	if (err)
 		goto put_resources;
 
-	err = mtk_pcie_register_host(host);
+	host->busnr = pcie->busn.start;
+	host->dev.parent = pcie->dev;
+	host->ops = pcie->soc->ops;
+	host->map_irq = of_irq_parse_and_map_pci;
+	host->swizzle_irq = pci_common_swizzle;
+	host->sysdata = pcie;
+
+	err = pci_host_probe(host);
 	if (err)
 		goto put_resources;