Re: [PATCH 3/6] usb: dwc3: add imx8mp dwc3 glue layer driver

+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	err = pm_runtime_get_sync(dev);
+	if (err < 0)
+		goto disable_rpm;
+
+	dwc3_np = of_get_child_by_name(node, "dwc3");
+	if (!dwc3_np) {
+		dev_err(dev, "failed to find dwc3 core child\n");
+		goto disable_rpm;
+	}

+
+	err = of_platform_populate(node, NULL, NULL, dev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to create dwc3 core\n");
+		goto disable_rpm;
+	}
+
+	dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np);
+	if (!dwc3_imx->dwc3) {
+		dev_err(dev, "failed to get dwc3 platform device\n");
+		err = -ENODEV;
+		goto depopulate;
+	}
+
+	device_set_wakeup_capable(dev, true);
+	pm_runtime_put(dev);
+
+	return 0;
+
+depopulate:
+	of_platform_depopulate(dev);
+disable_rpm:
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+disable_clks:
+	clk_disable_unprepare(dwc3_imx->clks[dwc3_imx->num_clks-1].clk);
+disable_bulk_clk:
+	clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks);
+
+	return err;
+}
+
+static int dwc3_imx8mp_remove(struct platform_device *pdev)
+{
+	struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+
+	pm_runtime_get_sync(dev);
+	of_platform_depopulate(dev);
+
+	clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks);
+	clk_disable_unprepare(dwc3_imx->clks[dwc3_imx->num_clks-1].clk);
+
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static int dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
+{
+	if (dwc3_imx->pm_suspended)
+		return 0;
+
+	/* Wakeup enable */
+	if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev))
+		dwc3_imx8mp_wakeup_enable(dwc3_imx);
+
+	clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks);
+	dwc3_imx->pm_suspended = true;
+
+	return 0;
+}
+
+static int dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
+{
+	struct dwc3	*dwc = platform_get_drvdata(dwc3_imx->dwc3);
+	int ret = 0;
+
+	if (!dwc3_imx->pm_suspended)
+		return 0;
+
+	ret = clk_bulk_prepare_enable(dwc3_imx->num_clks, dwc3_imx->clks);
+	if (ret)
+		return ret;
+
+	/* Wakeup disable */
+	dwc3_imx8mp_wakeup_disable(dwc3_imx);
+	dwc3_imx->pm_suspended = false;
+
+	if (dwc3_imx->wakeup_pending) {
+		dwc3_imx->wakeup_pending = false;
+		if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
+			pm_runtime_mark_last_busy(dwc->dev);
+			pm_runtime_put_autosuspend(dwc->dev);
+		} else {
+			/*
+			 * Add wait for xhci switch from suspend
+			 * clock to normal clock to detect connection.
+			 */
+			usleep_range(9000, 10000);
+		}
+		enable_irq(dwc3_imx->irq);
+	}
+
+	return ret;
+}
+