static int dwc3_suspend(struct device *dev)
{
	struct dwc3	*dwc = dev_get_drvdata(dev);
	unsigned long	flags;

	spin_lock_irqsave(&dwc->lock, flags);

	switch (dwc->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
		dwc3_gadget_suspend(dwc);
		/* FALLTHROUGH */
	case USB_DR_MODE_HOST:
	default:
		dwc3_event_buffers_cleanup(dwc);
		break;
	}

	dwc->gctl = dwc3_readl(dwc->regs, DWC3_GCTL);
	spin_unlock_irqrestore(&dwc->lock, flags);

	usb_phy_shutdown(dwc->usb3_phy);
	usb_phy_shutdown(dwc->usb2_phy);
	phy_exit(dwc->usb2_generic_phy);
	phy_exit(dwc->usb3_generic_phy);

	usb_phy_set_suspend(dwc->usb2_phy, 1);
	usb_phy_set_suspend(dwc->usb3_phy, 1);
	WARN_ON(phy_power_off(dwc->usb2_generic_phy) < 0);
	WARN_ON(phy_power_off(dwc->usb3_generic_phy) < 0);

	pinctrl_pm_select_sleep_state(dev);

	return 0;
}

static int dwc3_suspend(struct device *dev)
{
	struct dwc3	*dwc = dev_get_drvdata(dev);
	unsigned long	flags;

	spin_lock_irqsave(&dwc->lock, flags);

	switch (dwc->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
	case USB_DR_MODE_OTG:
		dwc3_gadget_suspend(dwc);
		/* FALLTHROUGH */
	case USB_DR_MODE_HOST:
	default:
		/* do nothing */
		break;
	}

	dwc->gctl = dwc3_readl(dwc->regs, DWC3_GCTL);
	spin_unlock_irqrestore(&dwc->lock, flags);

	usb_phy_shutdown(dwc->usb3_phy);
	usb_phy_shutdown(dwc->usb2_phy);
	phy_exit(dwc->usb2_generic_phy);
	phy_exit(dwc->usb3_generic_phy);

	return 0;
}

static int dra7xx_pcie_resume_noirq(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	int phy_count = dra7xx->phy_count;
	int ret;
	int i;

	for (i = 0; i < phy_count; i++) {
		ret = phy_init(dra7xx->phy[i]);
		if (ret < 0)
			goto err_phy;

		ret = phy_power_on(dra7xx->phy[i]);
		if (ret < 0) {
			phy_exit(dra7xx->phy[i]);
			goto err_phy;
		}
	}

	return 0;

err_phy:
	while (--i >= 0) {
		phy_power_off(dra7xx->phy[i]);
		phy_exit(dra7xx->phy[i]);
	}

	return ret;
}

static void dwc3_core_exit(struct dwc3 *dwc)
{
	dwc3_free_scratch_buffers(dwc);
	usb_phy_shutdown(dwc->usb2_phy);
	usb_phy_shutdown(dwc->usb3_phy);
	phy_exit(dwc->usb2_generic_phy);
	phy_exit(dwc->usb3_generic_phy);
}

/**
 * dwc3_core_soft_reset - Issues core soft reset and PHY reset
 * @dwc: pointer to our context structure
 */
static int dwc3_core_soft_reset(struct dwc3 *dwc)
{
	u32		reg;
	int		retries = 1000;
	int		ret;

	usb_phy_init(dwc->usb2_phy);
	usb_phy_init(dwc->usb3_phy);
	ret = phy_init(dwc->usb2_generic_phy);
	if (ret < 0)
		return ret;

	ret = phy_init(dwc->usb3_generic_phy);
	if (ret < 0) {
		phy_exit(dwc->usb2_generic_phy);
		return ret;
	}

	/*
	 * We're resetting only the device side because, if we're in host mode,
	 * XHCI driver will reset the host block. If dwc3 was configured for
	 * host-only mode, then we can return early.
	 */
	if (dwc->dr_mode == USB_DR_MODE_HOST || dwc->is_hibernated == true)
		return 0;

	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
		return 0;

	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	reg |= DWC3_DCTL_CSFTRST;
	dwc3_writel(dwc->regs, DWC3_DCTL, reg);

	do {
		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
		if (!(reg & DWC3_DCTL_CSFTRST))
			goto done;

		udelay(1);
	} while (--retries);

	phy_exit(dwc->usb3_generic_phy);
	phy_exit(dwc->usb2_generic_phy);

	return -ETIMEDOUT;

done:
	/*
	 * For DWC_usb31 controller, once DWC3_DCTL_CSFTRST bit is cleared,
	 * we must wait at least 50ms before accessing the PHY domain
	 * (synchronization delay). DWC_usb31 programming guide section 1.3.2.
	 */
	if (dwc3_is_usb31(dwc))
		msleep(50);

	return 0;
}

static void dwc3_core_exit(struct dwc3 *dwc)
{
	dwc3_event_buffers_cleanup(dwc);

	usb_phy_shutdown(dwc->usb2_phy);
	usb_phy_shutdown(dwc->usb3_phy);
	phy_exit(dwc->usb2_generic_phy);
	phy_exit(dwc->usb3_generic_phy);

	usb_phy_set_suspend(dwc->usb2_phy, 1);
	usb_phy_set_suspend(dwc->usb3_phy, 1);
	phy_power_off(dwc->usb2_generic_phy);
	phy_power_off(dwc->usb3_generic_phy);
}

static void dwc3_core_exit(struct dwc3 *dwc)
{
	usb_phy_shutdown(dwc->usb2_phy);
	usb_phy_shutdown(dwc->usb3_phy);
	phy_exit(dwc->usb2_generic_phy);
	phy_exit(dwc->usb3_generic_phy);

	usb_phy_set_suspend(dwc->usb2_phy, 1);
	usb_phy_set_suspend(dwc->usb3_phy, 1);
	phy_power_off(dwc->usb2_generic_phy);
	phy_power_off(dwc->usb3_generic_phy);
	clk_bulk_disable(dwc->num_clks, dwc->clks);
	clk_bulk_unprepare(dwc->num_clks, dwc->clks);
	reset_control_assert(dwc->reset);
}

static int ohci_da8xx_enable(struct usb_hcd *hcd)
{
	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
	int ret;

	ret = clk_prepare_enable(da8xx_ohci->usb11_clk);
	if (ret)
		return ret;

	ret = phy_init(da8xx_ohci->usb11_phy);
	if (ret)
		goto err_phy_init;

	ret = phy_power_on(da8xx_ohci->usb11_phy);
	if (ret)
		goto err_phy_power_on;

	return 0;

err_phy_power_on:
	phy_exit(da8xx_ohci->usb11_phy);
err_phy_init:
	clk_disable_unprepare(da8xx_ohci->usb11_clk);

	return ret;
}

static int __dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
{
	struct platform_device *pdev = to_platform_device(hsotg->dev);
	int ret = 0;

	if (hsotg->uphy) {
		usb_phy_shutdown(hsotg->uphy);
	} else if (hsotg->plat && hsotg->plat->phy_exit) {
		ret = hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type);
	} else {
		ret = phy_exit(hsotg->phy);
		if (ret == 0)
			ret = phy_power_off(hsotg->phy);
	}
	if (ret)
		return ret;

	if (hsotg->clk)
		clk_disable_unprepare(hsotg->clk);

	ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
				     hsotg->supplies);

	return ret;
}

static int da8xx_musb_init(struct musb *musb)
{
	struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
	void __iomem *reg_base = musb->ctrl_base;
	u32 rev;
	int ret = -ENODEV;

	musb->mregs += DA8XX_MENTOR_CORE_OFFSET;

	ret = clk_prepare_enable(glue->clk);
	if (ret) {
		dev_err(glue->dev, "failed to enable clock\n");
		return ret;
	}

	/* Returns zero if e.g. not clocked */
	rev = musb_readl(reg_base, DA8XX_USB_REVISION_REG);
	if (!rev)
		goto fail;

	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
	if (IS_ERR_OR_NULL(musb->xceiv)) {
		ret = -EPROBE_DEFER;
		goto fail;
	}

	setup_timer(&otg_workaround, otg_timer, (unsigned long)musb);

	/* Reset the controller */
	musb_writel(reg_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK);

	/* Start the on-chip PHY and its PLL. */
	ret = phy_init(glue->phy);
	if (ret) {
		dev_err(glue->dev, "Failed to init phy.\n");
		goto fail;
	}

	ret = phy_power_on(glue->phy);
	if (ret) {
		dev_err(glue->dev, "Failed to power on phy.\n");
		goto err_phy_power_on;
	}

	msleep(5);

	/* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */
	pr_debug("DA8xx OTG revision %08x, control %02x\n", rev,
		 musb_readb(reg_base, DA8XX_USB_CTRL_REG));

	musb->isr = da8xx_musb_interrupt;
	return 0;

err_phy_power_on:
	phy_exit(glue->phy);
fail:
	clk_disable_unprepare(glue->clk);
	return ret;
}

static void ohci_da8xx_disable(struct usb_hcd *hcd)
{
	struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);

	phy_power_off(da8xx_ohci->usb11_phy);
	phy_exit(da8xx_ohci->usb11_phy);
	clk_disable_unprepare(da8xx_ohci->usb11_clk);
}

static int omap2430_musb_exit(struct musb *musb)
{
	del_timer_sync(&musb_idle_timer);

	omap2430_low_level_exit(musb);
	phy_exit(musb->phy);

	return 0;
}

static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
{
	int i;

	for (i = 0; i < ssusb->num_phys; i++)
		phy_exit(ssusb->phys[i]);

	return 0;
}

static int xhci_mtk_phy_exit(struct xhci_hcd_mtk *mtk)
{
	int i;

	for (i = 0; i < mtk->num_phys; i++)
		phy_exit(mtk->phys[i]);

	return 0;
}

int iproc_pcie_remove(struct iproc_pcie *pcie)
{
	pci_stop_root_bus(pcie->root_bus);
	pci_remove_root_bus(pcie->root_bus);

	phy_power_off(pcie->phy);
	phy_exit(pcie->phy);

	return 0;
}

static int histb_pcie_remove(struct platform_device *pdev)
{
	struct histb_pcie *hipcie = platform_get_drvdata(pdev);

	histb_pcie_host_disable(hipcie);

	if (hipcie->phy)
		phy_exit(hipcie->phy);

	return 0;
}

/**
 * ahci_platform_disable_resources - Disable platform resources
 * @hpriv: host private area to store config values
 *
 * This function disables all ahci_platform managed resources in the
 * following order:
 * 1) Phy
 * 2) Clocks (through ahci_platform_disable_clks)
 * 3) Regulator
 */
void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
{
	if (hpriv->phy) {
		phy_power_off(hpriv->phy);
		phy_exit(hpriv->phy);
	}

	ahci_platform_disable_clks(hpriv);

	if (hpriv->target_pwr)
		regulator_disable(hpriv->target_pwr);
}

static int dsps_musb_exit(struct musb *musb)
{
	struct device *dev = musb->controller;
	struct dsps_glue *glue = dev_get_drvdata(dev->parent);

	del_timer_sync(&musb->dev_timer);
	phy_power_off(musb->phy);
	phy_exit(musb->phy);
	debugfs_remove_recursive(glue->dbgfs_root);

	return 0;
}

static int dra7xx_pcie_suspend_noirq(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	int count = dra7xx->phy_count;

	while (count--) {
		phy_power_off(dra7xx->phy[count]);
		phy_exit(dra7xx->phy[count]);
	}

	return 0;
}

static int ehci_platform_power_on(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
	int clk, ret, phy_num;

	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
		ret = clk_prepare_enable(priv->clks[clk]);
		if (ret)
			goto err_disable_clks;
	}

	for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
		if (priv->phys[phy_num]) {
			ret = phy_init(priv->phys[phy_num]);
			if (ret)
				goto err_exit_phy;
			ret = phy_power_on(priv->phys[phy_num]);
			if (ret) {
				phy_exit(priv->phys[phy_num]);
				goto err_exit_phy;
			}
		}
	}

	return 0;

err_exit_phy:
	while (--phy_num >= 0) {
		if (priv->phys[phy_num]) {
			phy_power_off(priv->phys[phy_num]);
			phy_exit(priv->phys[phy_num]);
		}
	}
err_disable_clks:
	while (--clk >= 0)
		clk_disable_unprepare(priv->clks[clk]);

	return ret;
}