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usb: otg: add an api to bind the usb controller and phy 

In order to support platforms which has multiple PHY's (of same type) and
which has multiple USB controllers, a new design is adopted wherin the binding
information (between the PHY and the USB controller) should be passed to the
PHY library from platform specific file (board file).
So added a new API to pass the binding information.

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 2013-01-25 08:03:21 +05:30 committed by Felipe Balbi
parent 5a1a174c2c
commit b4a83e4df1
2 changed files with 59 additions and 0 deletions
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37
drivers/usb/otg/otg.c
View File

@ -18,6 +18,7 @@
#include <linux/usb/otg.h>
static LIST_HEAD(phy_list);
static LIST_HEAD(phy_bind_list);
static DEFINE_SPINLOCK(phy_lock);
static struct usb_phy *__usb_find_phy(struct list_head *list,
@ -201,6 +202,42 @@ void usb_remove_phy(struct usb_phy *x)
}
EXPORT_SYMBOL(usb_remove_phy);
/**
* usb_bind_phy - bind the phy and the controller that uses the phy
* @dev_name: the device name of the device that will bind to the phy
* @index: index to specify the port number
* @phy_dev_name: the device name of the phy
*
* Fills the phy_bind structure with the dev_name and phy_dev_name. This will
* be used when the phy driver registers the phy and when the controller
* requests this phy.
*
* To be used by platform specific initialization code.
*/
int __init usb_bind_phy(const char *dev_name, u8 index,
const char *phy_dev_name)
{
struct usb_phy_bind *phy_bind;
unsigned long flags;
phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
if (!phy_bind) {
pr_err("phy_bind(): No memory for phy_bind");
return -ENOMEM;
}
phy_bind->dev_name = dev_name;
phy_bind->phy_dev_name = phy_dev_name;
phy_bind->index = index;
spin_lock_irqsave(&phy_lock, flags);
list_add_tail(&phy_bind->list, &phy_bind_list);
spin_unlock_irqrestore(&phy_lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(usb_bind_phy);
const char *otg_state_string(enum usb_otg_state state)
{
switch (state) {

22
include/linux/usb/phy.h
View File

@ -106,6 +106,21 @@ struct usb_phy {
enum usb_device_speed speed);
};
/**
* struct usb_phy_bind - represent the binding for the phy
* @dev_name: the device name of the device that will bind to the phy
* @phy_dev_name: the device name of the phy
* @index: used if a single controller uses multiple phys
* @phy: reference to the phy
* @list: to maintain a linked list of the binding information
*/
struct usb_phy_bind {
const char *dev_name;
const char *phy_dev_name;
u8 index;
struct usb_phy *phy;
struct list_head list;
};
/* for board-specific init logic */
extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
@ -151,6 +166,8 @@ extern struct usb_phy *devm_usb_get_phy(struct device *dev,
enum usb_phy_type type);
extern void usb_put_phy(struct usb_phy *);
extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
extern int usb_bind_phy(const char *dev_name, u8 index,
const char *phy_dev_name);
#else
static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
{
@ -171,6 +188,11 @@ static inline void devm_usb_put_phy(struct device *dev, struct usb_phy *x)
{
}
static inline int usb_bind_phy(const char *dev_name, u8 index,
const char *phy_dev_name)
{
return -EOPNOTSUPP;
}
#endif
static inline int