Re: [PATCH v5 2/2] PCI: layerscape: Add power management support for ls1028a

On Mon, Jul 24, 2023 at 05:58:30PM -0400, Frank Li wrote:

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

Add PME_Turn_Off/PME_TO_Ack handshake sequence, and finally
put the PCIe controller into D3 state after the L2/L3 ready
state transition process completion.
...

+#ifdef CONFIG_PM_SLEEP
+static int ls_pcie_suspend_noirq(struct device *dev)
+{
+	struct ls_pcie *pcie = dev_get_drvdata(dev);
+	struct dw_pcie *pci = pcie->pci;
+
+	if (!pcie->drvdata->pm_support)
+		return 0;
+
+	return dw_pcie_suspend_noirq(pci);
+}
+
+static int ls_pcie_resume_noirq(struct device *dev)
+{
+
+	struct ls_pcie *pcie = dev_get_drvdata(dev);
+	struct dw_pcie *pci = pcie->pci;
+
+	if (!pcie->drvdata->pm_support)
+		return 0;
+
+	return dw_pcie_resume_noirq(pci);
+}
+#endif /* CONFIG_PM_SLEEP */

You may be able to dispense with some of these #ifdefs as in
https://lore.kernel.org/all/20220720224829.GA1667002@bhelgaas/ (local)

+static const struct dev_pm_ops ls_pcie_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(ls_pcie_suspend_noirq,
+				      ls_pcie_resume_noirq)
+};
+
 static struct platform_driver ls_pcie_driver = {
 	.probe = ls_pcie_probe,
 	.driver = {
 		.name = "layerscape-pcie",
 		.of_match_table = ls_pcie_of_match,
 		.suppress_bind_attrs = true,
+		.pm = &ls_pcie_pm_ops,
 	},
 };
 builtin_platform_driver(ls_pcie_driver);
-- 
2.34.1