PCI: dwc: ep: Consolidate devicetree handling in dw_pcie_ep_get_resources()

Consolidate devicetree resource handling in dw_pcie_ep_get_resources().
No functional change intended.

Link: https://lore.kernel.org/r/20250315201548.858189-10-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>

Author: bjorn-helgaas

drivers/pci/controller/dwc/pcie-designware-ep.c

@@ -883,6 +883,34 @@ void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
 }
 EXPORT_SYMBOL_GPL(dw_pcie_ep_linkdown);
 
+static int dw_pcie_ep_get_resources(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct device *dev = pci->dev;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct device_node *np = dev->of_node;
+	struct pci_epc *epc = ep->epc;
+	struct resource *res;
+	int ret;
+
+	ret = dw_pcie_get_resources(pci);
+	if (ret)
+		return ret;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
+	if (!res)
+		return -EINVAL;
+
+	ep->phys_base = res->start;
+	ep->addr_size = resource_size(res);
+
+	ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
+	if (ret < 0)
+		epc->max_functions = 1;
+
+	return 0;
+}
+
 /**
  * dw_pcie_ep_init - Initialize the endpoint device
  * @ep: DWC EP device
@@ -895,12 +923,9 @@ EXPORT_SYMBOL_GPL(dw_pcie_ep_linkdown);
 int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 {
 	int ret;
-	struct resource *res;
 	struct pci_epc *epc;
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	struct device *dev = pci->dev;
-	struct platform_device *pdev = to_platform_device(dev);
-	struct device_node *np = dev->of_node;
 
 	INIT_LIST_HEAD(&ep->func_list);
 
@@ -913,24 +938,13 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 	ep->epc = epc;
 	epc_set_drvdata(epc, ep);
 
-	ret = dw_pcie_get_resources(pci);
+	ret = dw_pcie_ep_get_resources(ep);
 	if (ret)
 		return ret;
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
-
 	if (ep->ops->pre_init)
 		ep->ops->pre_init(ep);
 
-	ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
-	if (ret < 0)
-		epc->max_functions = 1;
-
 	ret = pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
 			       ep->page_size);
 	if (ret < 0) {