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usb: otg: support for multiple transceivers by a single controller 

Add a linked list for keeping multiple PHY instances with different
types so that we can have separate USB2 and USB3 PHYs on one single
board. _get_phy_ has been changed so that the controller gets
the transceiver by type. _remove_phy_ has been added to let the phy
be removed from the phy list.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2012-06-22 17:02:46 +05:30 committed by Felipe Balbi
parent 721002ec1d
commit 662dca54ca
35 changed files with 152 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/power/ab8500_charger.c
View File

@ -2688,7 +2688,7 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev)
goto free_ac;
}
di->usb_phy = usb_get_phy();
di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
if (!di->usb_phy) {
dev_err(di->dev, "failed to get usb transceiver\n");
ret = -EINVAL;

2
drivers/power/isp1704_charger.c
View File

@ -415,7 +415,7 @@ static int __devinit isp1704_charger_probe(struct platform_device *pdev)
if (!isp)
return -ENOMEM;
isp->phy = usb_get_phy();
isp->phy = usb_get_phy(USB_PHY_TYPE_USB2);
if (!isp->phy)
goto fail0;

2
drivers/power/pda_power.c
View File

@ -321,7 +321,7 @@ static int pda_power_probe(struct platform_device *pdev)
}
#ifdef CONFIG_USB_OTG_UTILS
transceiver = usb_get_phy();
transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (transceiver && !pdata->is_usb_online) {
pdata->is_usb_online = otg_is_usb_online;
}

2
drivers/power/twl4030_charger.c
View File

@ -479,7 +479,7 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
INIT_WORK(&bci->work, twl4030_bci_usb_work);
bci->transceiver = usb_get_phy();
bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (bci->transceiver != NULL) {
bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
usb_register_notifier(bci->transceiver, &bci->usb_nb);

2
drivers/usb/chipidea/udc.c
View File

@ -1687,7 +1687,7 @@ static int udc_start(struct ci13xxx *udc)
udc->gadget.ep0 = &udc->ep0in->ep;
udc->transceiver = usb_get_phy();
udc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (udc->udc_driver->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
if (udc->transceiver == NULL) {

2
drivers/usb/gadget/fsl_udc_core.c
View File

@ -2455,7 +2455,7 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
#ifdef CONFIG_USB_OTG
if (pdata->operating_mode == FSL_USB2_DR_OTG) {
udc_controller->transceiver = usb_get_phy();
udc_controller->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (!udc_controller->transceiver) {
ERR("Can't find OTG driver!\n");
ret = -ENODEV;

2
drivers/usb/gadget/mv_udc_core.c
View File

@ -2180,7 +2180,7 @@ static int __devinit mv_udc_probe(struct platform_device *dev)
#ifdef CONFIG_USB_OTG_UTILS
if (pdata->mode == MV_USB_MODE_OTG)
udc->transceiver = usb_get_phy();
udc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
#endif
udc->clknum = pdata->clknum;

2
drivers/usb/gadget/omap_udc.c
View File

@ -2865,7 +2865,7 @@ static int __init omap_udc_probe(struct platform_device *pdev)
* use it. Except for OTG, we don't _need_ to talk to one;
* but not having one probably means no VBUS detection.
*/
xceiv = usb_get_phy();
xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (xceiv)
type = xceiv->label;
else if (config->otg) {

2
drivers/usb/gadget/pxa25x_udc.c
View File

@ -2159,7 +2159,7 @@ static int __init pxa25x_udc_probe(struct platform_device *pdev)
dev->dev = &pdev->dev;
dev->mach = pdev->dev.platform_data;
dev->transceiver = usb_get_phy();
dev->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (gpio_is_valid(dev->mach->gpio_pullup)) {
if ((retval = gpio_request(dev->mach->gpio_pullup,

2
drivers/usb/gadget/pxa27x_udc.c
View File

@ -2464,7 +2464,7 @@ static int __init pxa_udc_probe(struct platform_device *pdev)
udc->dev = &pdev->dev;
udc->mach = pdev->dev.platform_data;
udc->transceiver = usb_get_phy();
udc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
gpio = udc->mach->gpio_pullup;
if (gpio_is_valid(gpio)) {

2
drivers/usb/gadget/s3c-hsudc.c
View File

@ -1282,7 +1282,7 @@ static int __devinit s3c_hsudc_probe(struct platform_device *pdev)
hsudc->dev = dev;
hsudc->pd = pdev->dev.platform_data;
hsudc->transceiver = usb_get_phy();
hsudc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
for (i = 0; i < ARRAY_SIZE(hsudc->supplies); i++)
hsudc->supplies[i].supply = s3c_hsudc_supply_names[i];

2
drivers/usb/host/ehci-fsl.c
View File

@ -142,7 +142,7 @@ static int usb_hcd_fsl_probe(const struct hc_driver *driver,
if (pdata->operating_mode == FSL_USB2_DR_OTG) {
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
ehci->transceiver = usb_get_phy();
ehci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
dev_dbg(&pdev->dev, "hcd=0x%p ehci=0x%p, transceiver=0x%p\n",
hcd, ehci, ehci->transceiver);

2
drivers/usb/host/ehci-msm.c
View File

@ -145,7 +145,7 @@ static int ehci_msm_probe(struct platform_device *pdev)
* powering up VBUS, mapping of registers address space and power
* management.
*/
phy = usb_get_phy();
phy = usb_get_phy(USB_PHY_TYPE_USB2);
if (!phy) {
dev_err(&pdev->dev, "unable to find transceiver\n");
ret = -ENODEV;

2
drivers/usb/host/ehci-mv.c
View File

@ -253,7 +253,7 @@ static int mv_ehci_probe(struct platform_device *pdev)
ehci_mv->mode = pdata->mode;
if (ehci_mv->mode == MV_USB_MODE_OTG) {
#ifdef CONFIG_USB_OTG_UTILS
ehci_mv->otg = usb_get_phy();
ehci_mv->otg = usb_get_phy(USB_PHY_TYPE_USB2);
if (!ehci_mv->otg) {
dev_err(&pdev->dev,
"unable to find transceiver\n");

2
drivers/usb/host/ehci-tegra.c
View File

@ -749,7 +749,7 @@ static int tegra_ehci_probe(struct platform_device *pdev)
#ifdef CONFIG_USB_OTG_UTILS
if (pdata->operating_mode == TEGRA_USB_OTG) {
tegra->transceiver = usb_get_phy();
tegra->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (tegra->transceiver)
otg_set_host(tegra->transceiver->otg, &hcd->self);
}

2
drivers/usb/host/ohci-omap.c
View File

@ -211,7 +211,7 @@ static int ohci_omap_init(struct usb_hcd *hcd)
#ifdef CONFIG_USB_OTG
if (need_transceiver) {
ohci->transceiver = usb_get_phy();
ohci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (ohci->transceiver) {
int status = otg_set_host(ohci->transceiver->otg,
&ohci_to_hcd(ohci)->self);

2
drivers/usb/musb/am35x.c
View File

@ -364,7 +364,7 @@ static int am35x_musb_init(struct musb *musb)
return -ENODEV;
usb_nop_xceiv_register();
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv)
return -ENODEV;

2
drivers/usb/musb/blackfin.c
View File

@ -415,7 +415,7 @@ static int bfin_musb_init(struct musb *musb)
gpio_direction_output(musb->config->gpio_vrsel, 0);
usb_nop_xceiv_register();
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv) {
gpio_free(musb->config->gpio_vrsel);
return -ENODEV;

2
drivers/usb/musb/da8xx.c
View File

@ -425,7 +425,7 @@ static int da8xx_musb_init(struct musb *musb)
goto fail;
usb_nop_xceiv_register();
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv)
goto fail;

2
drivers/usb/musb/davinci.c
View File

@ -384,7 +384,7 @@ static int davinci_musb_init(struct musb *musb)
u32 revision;
usb_nop_xceiv_register();
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv)
goto unregister;

2
drivers/usb/musb/musb_dsps.c
View File

@ -376,7 +376,7 @@ static int dsps_musb_init(struct musb *musb)
/* NOP driver needs change if supporting dual instance */
usb_nop_xceiv_register();
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv)
return -ENODEV;

2
drivers/usb/musb/omap2430.c
View File

@ -292,7 +292,7 @@ static int omap2430_musb_init(struct musb *musb)
* up through ULPI. TWL4030-family PMICs include one,
* which needs a driver, drivers aren't always needed.
*/
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv) {
pr_err("HS USB OTG: no transceiver configured\n");
return -ENODEV;

2
drivers/usb/musb/tusb6010.c
View File

@ -1078,7 +1078,7 @@ static int tusb_musb_init(struct musb *musb)
int ret;
usb_nop_xceiv_register();
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv)
return -ENODEV;

2
drivers/usb/musb/ux500.c
View File

@ -37,7 +37,7 @@ struct ux500_glue {
static int ux500_musb_init(struct musb *musb)
{
musb->xceiv = usb_get_phy();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv) {
pr_err("HS USB OTG: no transceiver configured\n");
return -ENODEV;

4
drivers/usb/otg/ab8500-usb.c
View File

@ -529,7 +529,7 @@ static int __devinit ab8500_usb_probe(struct platform_device *pdev)
if (err < 0)
goto fail0;
err = usb_add_phy(&ab->phy);
err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
if (err) {
dev_err(&pdev->dev, "Can't register transceiver\n");
goto fail1;
@ -556,7 +556,7 @@ static int __devexit ab8500_usb_remove(struct platform_device *pdev)
cancel_work_sync(&ab->phy_dis_work);
usb_add_phy(NULL);
usb_remove_phy(&ab->phy);
ab8500_usb_host_phy_dis(ab);
ab8500_usb_peri_phy_dis(ab);

6
drivers/usb/otg/fsl_otg.c
View File

@ -806,7 +806,7 @@ static int fsl_otg_conf(struct platform_device *pdev)
fsl_otg_dev = fsl_otg_tc;
/* Store the otg transceiver */
status = usb_add_phy(&fsl_otg_tc->phy);
status = usb_add_phy(&fsl_otg_tc->phy, USB_PHY_TYPE_USB2);
if (status) {
pr_warn(FSL_OTG_NAME ": unable to register OTG transceiver.\n");
goto err;
@ -824,7 +824,7 @@ static int fsl_otg_conf(struct platform_device *pdev)
int usb_otg_start(struct platform_device *pdev)
{
struct fsl_otg *p_otg;
struct usb_phy *otg_trans = usb_get_phy();
struct usb_phy *otg_trans = usb_get_phy(USB_PHY_TYPE_USB2);
struct otg_fsm *fsm;
int status;
struct resource *res;
@ -1134,7 +1134,7 @@ static int __devexit fsl_otg_remove(struct platform_device *pdev)
{
struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
usb_add_phy(NULL);
usb_remove_phy(&fsl_otg_dev->phy);
free_irq(fsl_otg_dev->irq, fsl_otg_dev);
iounmap((void *)usb_dr_regs);

4
drivers/usb/otg/gpio_vbus.c
View File

@ -320,7 +320,7 @@ static int __init gpio_vbus_probe(struct platform_device *pdev)
}
/* only active when a gadget is registered */
err = usb_add_phy(&gpio_vbus->phy);
err = usb_add_phy(&gpio_vbus->phy, USB_PHY_TYPE_USB2);
if (err) {
dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
err);
@ -354,7 +354,7 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev)
cancel_delayed_work_sync(&gpio_vbus->work);
regulator_put(gpio_vbus->vbus_draw);
usb_add_phy(NULL);
usb_remove_phy(&gpio_vbus->phy);
free_irq(gpio_vbus->irq, pdev);
if (gpio_is_valid(pdata->gpio_pullup))

4
drivers/usb/otg/isp1301_omap.c
View File

@ -1611,7 +1611,7 @@ isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
#endif
status = usb_add_phy(&isp->phy);
status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
if (status < 0)
dev_err(&i2c->dev, "can't register transceiver, %d\n",
status);
@ -1650,7 +1650,7 @@ subsys_initcall(isp_init);
static void __exit isp_exit(void)
{
if (the_transceiver)
usb_add_phy(NULL);
usb_remove_phy(&the_transceiver->phy);
i2c_del_driver(&isp1301_driver);
}
module_exit(isp_exit);

4
drivers/usb/otg/msm_otg.c
View File

@ -1555,7 +1555,7 @@ static int __init msm_otg_probe(struct platform_device *pdev)
phy->otg->set_host = msm_otg_set_host;
phy->otg->set_peripheral = msm_otg_set_peripheral;
ret = usb_add_phy(&motg->phy);
ret = usb_add_phy(&motg->phy, USB_PHY_TYPE_USB2);
if (ret) {
dev_err(&pdev->dev, "usb_add_phy failed\n");
goto free_irq;
@ -1624,7 +1624,7 @@ static int __devexit msm_otg_remove(struct platform_device *pdev)
device_init_wakeup(&pdev->dev, 0);
pm_runtime_disable(&pdev->dev);
usb_add_phy(NULL);
usb_remove_phy(phy);
free_irq(motg->irq, motg);
/*

6
drivers/usb/otg/mv_otg.c
View File

@ -690,7 +690,7 @@ int mv_otg_remove(struct platform_device *pdev)
for (clk_i = 0; clk_i <= mvotg->clknum; clk_i++)
clk_put(mvotg->clk[clk_i]);
usb_add_phy(NULL);
usb_remove_phy(&mvotg->phy);
platform_set_drvdata(pdev, NULL);
kfree(mvotg->phy.otg);
@ -853,7 +853,7 @@ static int mv_otg_probe(struct platform_device *pdev)
goto err_disable_clk;
}
retval = usb_add_phy(&mvotg->phy);
retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
if (retval < 0) {
dev_err(&pdev->dev, "can't register transceiver, %d\n",
retval);
@ -880,7 +880,7 @@ static int mv_otg_probe(struct platform_device *pdev)
return 0;
err_set_transceiver:
usb_add_phy(NULL);
usb_remove_phy(&mvotg->phy);
err_free_irq:
free_irq(mvotg->irq, mvotg);
err_disable_clk:

4
drivers/usb/otg/nop-usb-xceiv.c
View File

@ -117,7 +117,7 @@ static int __devinit nop_usb_xceiv_probe(struct platform_device *pdev)
nop->phy.otg->set_host = nop_set_host;
nop->phy.otg->set_peripheral = nop_set_peripheral;
err = usb_add_phy(&nop->phy);
err = usb_add_phy(&nop->phy, USB_PHY_TYPE_USB2);
if (err) {
dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
err);
@ -139,7 +139,7 @@ static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev)
{
struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);
usb_add_phy(NULL);
usb_remove_phy(&nop->phy);
platform_set_drvdata(pdev, NULL);
kfree(nop->phy.otg);

96
drivers/usb/otg/otg.c
View File

@ -11,14 +11,32 @@
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/usb/otg.h>
static struct usb_phy *phy;
static LIST_HEAD(phy_list);
static DEFINE_SPINLOCK(phy_lock);
static struct usb_phy *__usb_find_phy(struct list_head *list,
enum usb_phy_type type)
{
struct usb_phy *phy = NULL;
list_for_each_entry(phy, list, head) {
if (phy->type != type)
continue;
return phy;
}
return ERR_PTR(-ENODEV);
}
/**
* usb_get_phy - find the (single) USB PHY
* usb_get_phy - find the USB PHY
* @type - the type of the phy the controller requires
*
* Returns the phy driver, after getting a refcount to it; or
* null if there is no such phy. The caller is responsible for
@ -26,16 +44,30 @@ static struct usb_phy *phy;
*
* For use by USB host and peripheral drivers.
*/
struct usb_phy *usb_get_phy(void)
struct usb_phy *usb_get_phy(enum usb_phy_type type)
{
if (phy)
get_device(phy->dev);
struct usb_phy *phy = NULL;
unsigned long flags;
spin_lock_irqsave(&phy_lock, flags);
phy = __usb_find_phy(&phy_list, type);
if (IS_ERR(phy)) {
pr_err("unable to find transceiver of type %s\n",
usb_phy_type_string(type));
return phy;
}
get_device(phy->dev);
spin_unlock_irqrestore(&phy_lock, flags);
return phy;
}
EXPORT_SYMBOL(usb_get_phy);
/**
* usb_put_phy - release the (single) USB PHY
* usb_put_phy - release the USB PHY
* @x: the phy returned by usb_get_phy()
*
* Releases a refcount the caller received from usb_get_phy().
@ -50,22 +82,62 @@ void usb_put_phy(struct usb_phy *x)
EXPORT_SYMBOL(usb_put_phy);
/**
* usb_add_phy - declare the (single) USB PHY
* usb_add_phy - declare the USB PHY
* @x: the USB phy to be used; or NULL
* @type - the type of this PHY
*
* This call is exclusively for use by phy drivers, which
* coordinate the activities of drivers for host and peripheral
* controllers, and in some cases for VBUS current regulation.
*/
int usb_add_phy(struct usb_phy *x)
int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
{
if (phy && x)
return -EBUSY;
phy = x;
return 0;
int ret = 0;
unsigned long flags;
struct usb_phy *phy;
if (x && x->type != USB_PHY_TYPE_UNDEFINED) {
dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
return -EINVAL;
}
spin_lock_irqsave(&phy_lock, flags);
list_for_each_entry(phy, &phy_list, head) {
if (phy->type == type) {
ret = -EBUSY;
dev_err(x->dev, "transceiver type %s already exists\n",
usb_phy_type_string(type));
goto out;
}
}
x->type = type;
list_add_tail(&x->head, &phy_list);
out:
spin_unlock_irqrestore(&phy_lock, flags);
return ret;
}
EXPORT_SYMBOL(usb_add_phy);
/**
* usb_remove_phy - remove the OTG PHY
* @x: the USB OTG PHY to be removed;
*
* This reverts the effects of usb_add_phy
*/
void usb_remove_phy(struct usb_phy *x)
{
unsigned long flags;
spin_lock_irqsave(&phy_lock, flags);
if (x)
list_del(&x->head);
spin_unlock_irqrestore(&phy_lock, flags);
}
EXPORT_SYMBOL(usb_remove_phy);
const char *otg_state_string(enum usb_otg_state state)
{
switch (state) {

2
drivers/usb/otg/twl4030-usb.c
View File

@ -633,7 +633,7 @@ static int __devinit twl4030_usb_probe(struct platform_device *pdev)
kfree(twl);
return err;
}
usb_add_phy(&twl->phy);
usb_add_phy(&twl->phy, USB_PHY_TYPE_USB2);
platform_set_drvdata(pdev, twl);
if (device_create_file(&pdev->dev, &dev_attr_vbus))

2
drivers/usb/otg/twl6030-usb.c
View File

@ -443,7 +443,7 @@ static int __devinit twl6030_usb_probe(struct platform_device *pdev)
kfree(twl);
return err;
}
usb_add_phy(&twl->phy);
usb_add_phy(&twl->phy, USB_PHY_TYPE_USB2);
platform_set_drvdata(pdev, twl);
if (device_create_file(&pdev->dev, &dev_attr_vbus))

29
include/linux/usb/otg.h
View File

@ -43,6 +43,13 @@ enum usb_phy_events {
USB_EVENT_ENUMERATED, /* gadget driver enumerated */
};
/* associate a type with PHY */
enum usb_phy_type {
USB_PHY_TYPE_UNDEFINED,
USB_PHY_TYPE_USB2,
USB_PHY_TYPE_USB3,
};
struct usb_phy;
/* for transceivers connected thru an ULPI interface, the user must
@ -89,6 +96,7 @@ struct usb_phy {
const char *label;
unsigned int flags;
enum usb_phy_type type;
enum usb_otg_state state;
enum usb_phy_events last_event;
@ -105,6 +113,9 @@ struct usb_phy {
u16 port_status;
u16 port_change;
/* to support controllers that have multiple transceivers */
struct list_head head;
/* initialize/shutdown the OTG controller */
int (*init)(struct usb_phy *x);
void (*shutdown)(struct usb_phy *x);
@ -121,7 +132,8 @@ struct usb_phy {
/* for board-specific init logic */
extern int usb_add_phy(struct usb_phy *);
extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
extern void usb_remove_phy(struct usb_phy *);
#if defined(CONFIG_NOP_USB_XCEIV) || (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
/* sometimes transceivers are accessed only through e.g. ULPI */
@ -172,11 +184,11 @@ usb_phy_shutdown(struct usb_phy *x)
/* for usb host and peripheral controller drivers */
#ifdef CONFIG_USB_OTG_UTILS
extern struct usb_phy *usb_get_phy(void);
extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
extern void usb_put_phy(struct usb_phy *);
extern const char *otg_state_string(enum usb_otg_state state);
#else
static inline struct usb_phy *usb_get_phy(void)
static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
{
return NULL;
}
@ -276,4 +288,15 @@ usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
/* for OTG controller drivers (and maybe other stuff) */
extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
static inline const char *usb_phy_type_string(enum usb_phy_type type)
{
switch (type) {
case USB_PHY_TYPE_USB2:
return "USB2 PHY";
case USB_PHY_TYPE_USB3:
return "USB3 PHY";
default:
return "UNKNOWN PHY TYPE";
}
}
#endif /* __LINUX_USB_OTG_H */