[PATCH v12 09/13] PCI: dwc: ep: Consolidate devicetree handling in dw_pcie_ep_get_resources()

Bjorn Helgaas
2025-03-15T20:34:01Z

From: Bjorn Helgaas <bhelgaas@google.com>

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

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
.../pci/controller/dwc/pcie-designware-ep.c | 68 +++++++++++--------
1 file changed, 41 insertions(+), 27 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 100d26466f05..2db834345ec2 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -883,35 +883,15 @@ void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
}
EXPORT_SYMBOL_GPL(dw_pcie_ep_linkdown);

-/**
- * dw_pcie_ep_init - Initialize the endpoint device
- * @ep: DWC EP device
- *
- * Initialize the endpoint device. Allocate resources and create the EPC
- * device with the endpoint framework.
- *
- * Return: 0 if success, errno otherwise.
- */
-int dw_pcie_ep_init(struct dw_pcie_ep *ep)
+static int dw_pcie_ep_get_resources(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);
-
- epc = devm_pci_epc_create(dev, &epc_ops);
- if (IS_ERR(epc)) {
- dev_err(dev, "Failed to create epc device\n");
- return PTR_ERR(epc);
- }
-
- ep->epc = epc;
- epc_set_drvdata(epc, ep);
+ struct pci_epc *epc = ep->epc;
+ struct resource *res;
+ int ret;

ret = dw_pcie_get_resources(pci);
if (ret)
@@ -924,13 +904,47 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
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;

+ return 0;
+}
+
+/**
+ * dw_pcie_ep_init - Initialize the endpoint device
+ * @ep: DWC EP device
+ *
+ * Initialize the endpoint device. Allocate resources and create the EPC
+ * device with the endpoint framework.
+ *
+ * Return: 0 if success, errno otherwise.
+ */
+int dw_pcie_ep_init(struct dw_pcie_ep *ep)
+{
+ int ret;
+ struct pci_epc *epc;
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ struct device *dev = pci->dev;
+
+ INIT_LIST_HEAD(&ep->func_list);
+
+ epc = devm_pci_epc_create(dev, &epc_ops);
+ if (IS_ERR(epc)) {
+ dev_err(dev, "Failed to create epc device\n");
+ return PTR_ERR(epc);
+ }
+
+ ep->epc = epc;
+ epc_set_drvdata(epc, ep);
+
+ ret = dw_pcie_ep_get_resources(ep);
+ if (ret)
+ return ret;
+
+ if (ep->ops->pre_init)
+ ep->ops->pre_init(ep);
+
ret = pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
ep->page_size);
if (ret < 0) {
--
2.34.1