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usb: phy: Add interface to get phy give of device_node. 

Split the "get phy from device_node" functionality out of
"get phy by phandle" so it can be used directly.

This is useful when a battery-charger is intimately associated with a
particular phy but handled by a separate driver.  The charger
can find the device_node based on sibling relationships
without the need for a redundant declaration in the devicetree
description.

As a peripheral that gets a phy will often want to register a
notifier block, and de-register it later, that functionality
is included so the de-registration is automatic.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
NeilBrown 2015-03-23 09:52:48 +11:00 committed by Felipe Balbi
parent 11bece5e06
commit e842b84c8e
2 changed files with 72 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
drivers/usb/phy/phy.c
View File

@ -22,6 +22,11 @@ static LIST_HEAD(phy_list);
static LIST_HEAD(phy_bind_list);
static DEFINE_SPINLOCK(phy_lock);
struct phy_devm {
struct usb_phy *phy;
struct notifier_block *nb;
};
static struct usb_phy *__usb_find_phy(struct list_head *list,
enum usb_phy_type type)
{
@ -79,6 +84,15 @@ static void devm_usb_phy_release(struct device *dev, void *res)
usb_put_phy(phy);
}
static void devm_usb_phy_release2(struct device *dev, void *_res)
{
struct phy_devm *res = _res;
if (res->nb)
usb_unregister_notifier(res->phy, res->nb);
usb_put_phy(res->phy);
}
static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
{
struct usb_phy **phy = res;
@ -153,40 +167,30 @@ err0:
EXPORT_SYMBOL_GPL(usb_get_phy);
/**
* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
* devm_usb_get_phy_by_node - find the USB PHY by device_node
* @dev - device that requests this phy
* @phandle - name of the property holding the phy phandle value
* @index - the index of the phy
* @node - the device_node for the phy device.
* @nb - a notifier_block to register with the phy.
*
* Returns the phy driver associated with the given phandle value,
* Returns the phy driver associated with the given device_node,
* after getting a refcount to it, -ENODEV if there is no such phy or
* -EPROBE_DEFER if there is a phandle to the phy, but the device is
* not yet loaded. While at that, it also associates the device with
* -EPROBE_DEFER if the device is not yet loaded. While at that, it
* also associates the device with
* the phy using devres. On driver detach, release function is invoked
* on the devres data, then, devres data is freed.
*
* For use by USB host and peripheral drivers.
* For use by peripheral drivers for devices related to a phy,
* such as a charger.
*/
struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
const char *phandle, u8 index)
struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
struct device_node *node,
struct notifier_block *nb)
{
struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr;
struct usb_phy *phy = ERR_PTR(-ENOMEM);
struct phy_devm *ptr;
unsigned long flags;
struct device_node *node;
if (!dev->of_node) {
dev_dbg(dev, "device does not have a device node entry\n");
return ERR_PTR(-EINVAL);
}
node = of_parse_phandle(dev->of_node, phandle, index);
if (!node) {
dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
dev->of_node->full_name);
return ERR_PTR(-ENODEV);
}
ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
if (!ptr) {
dev_dbg(dev, "failed to allocate memory for devres\n");
goto err0;
@ -205,8 +209,10 @@ struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
devres_free(ptr);
goto err1;
}
*ptr = phy;
if (nb)
usb_register_notifier(phy, nb);
ptr->phy = phy;
ptr->nb = nb;
devres_add(dev, ptr);
get_device(phy->dev);
@ -215,10 +221,47 @@ err1:
spin_unlock_irqrestore(&phy_lock, flags);
err0:
of_node_put(node);
return phy;
}
EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
/**
* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
* @dev - device that requests this phy
* @phandle - name of the property holding the phy phandle value
* @index - the index of the phy
*
* Returns the phy driver associated with the given phandle value,
* after getting a refcount to it, -ENODEV if there is no such phy or
* -EPROBE_DEFER if there is a phandle to the phy, but the device is
* not yet loaded. While at that, it also associates the device with
* the phy using devres. On driver detach, release function is invoked
* on the devres data, then, devres data is freed.
*
* For use by USB host and peripheral drivers.
*/
struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
const char *phandle, u8 index)
{
struct device_node *node;
struct usb_phy *phy;
if (!dev->of_node) {
dev_dbg(dev, "device does not have a device node entry\n");
return ERR_PTR(-EINVAL);
}
node = of_parse_phandle(dev->of_node, phandle, index);
if (!node) {
dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
dev->of_node->full_name);
return ERR_PTR(-ENODEV);
}
phy = devm_usb_get_phy_by_node(dev, node, NULL);
of_node_put(node);
return phy;
}
EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
/**

2
include/linux/usb/phy.h
View File

@ -205,6 +205,8 @@ extern struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index);
extern struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index);
extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
const char *phandle, u8 index);
extern struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
struct device_node *node, struct notifier_block *nb);
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,