linux-kernel - [PATCH v12 09/13] PCI: dwc: ep: Consolidate devicetree handling in dw_pcie_ep_get

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Message-Id: <20250315201548.858189-10-helgaas@kernel.org>
Date: Sat, 15 Mar 2025 15:15:44 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Niklas Cassel <cassel@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v12 09/13] PCI: dwc: ep: Consolidate devicetree handling in dw_pcie_ep_get_resources()

From: Bjorn Helgaas <bhelgaas@...gle.com>

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

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.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