PCI: qcom-ep: Modify 'global_irq' and 'perst_irq' IRQ device names

Currently, the IRQ device name for both of these IRQs doesn't have Qcom
specific prefix and PCIe domain number. This causes 2 issues:

1. Pollutes the global IRQ namespace since 'global' is a common name.
2. When more than one EP controller instance is present in the SoC, naming
conflict will occur.

Hence, add 'qcom_pcie_ep_' prefix and PCIe domain number suffix to the IRQ
names to uniquely identify the IRQs and also to fix the above mentioned
issues.

Link: https://lore.kernel.org/linux-pci/20240828-pci-qcom-hotplug-v4-6-263a385fbbcb@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>

Author: Mani-Sadhasivam

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

@@ -711,27 +711,39 @@ static irqreturn_t qcom_pcie_ep_perst_irq_thread(int irq, void *data)
 static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev,
 					     struct qcom_pcie_ep *pcie_ep)
 {
+	struct device *dev = pcie_ep->pci.dev;
+	char *name;
 	int ret;
 
+	name = devm_kasprintf(dev, GFP_KERNEL, "qcom_pcie_ep_global_irq%d",
+			      pcie_ep->pci.ep.epc->domain_nr);
+	if (!name)
+		return -ENOMEM;
+
 	pcie_ep->global_irq = platform_get_irq_byname(pdev, "global");
 	if (pcie_ep->global_irq < 0)
 		return pcie_ep->global_irq;
 
 	ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->global_irq, NULL,
 					qcom_pcie_ep_global_irq_thread,
 					IRQF_ONESHOT,
-					"global_irq", pcie_ep);
+					name, pcie_ep);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request Global IRQ\n");
 		return ret;
 	}
 
+	name = devm_kasprintf(dev, GFP_KERNEL, "qcom_pcie_ep_perst_irq%d",
+			      pcie_ep->pci.ep.epc->domain_nr);
+	if (!name)
+		return -ENOMEM;
+
 	pcie_ep->perst_irq = gpiod_to_irq(pcie_ep->reset);
 	irq_set_status_flags(pcie_ep->perst_irq, IRQ_NOAUTOEN);
 	ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->perst_irq, NULL,
 					qcom_pcie_ep_perst_irq_thread,
 					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
-					"perst_irq", pcie_ep);
+					name, pcie_ep);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request PERST IRQ\n");
 		disable_irq(pcie_ep->global_irq);