Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 748 insertions, 0 deletions

diff --git a/drivers/usb/phy/phy.c b/drivers/usb/phy/phy.c
new file mode 100644
index 000000000..5a9b9353f
--- /dev/null
+++ b/drivers/usb/phy/phy.c
@@ -0,0 +1,748 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * phy.c -- USB phy handling
+ *
+ * Copyright (C) 2004-2013 Texas Instruments
+ */
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+#include <linux/usb/phy.h>
+
+/* Default current range by charger type. */
+#define DEFAULT_SDP_CUR_MIN	2
+#define DEFAULT_SDP_CUR_MAX	500
+#define DEFAULT_SDP_CUR_MIN_SS	150
+#define DEFAULT_SDP_CUR_MAX_SS	900
+#define DEFAULT_DCP_CUR_MIN	500
+#define DEFAULT_DCP_CUR_MAX	5000
+#define DEFAULT_CDP_CUR_MIN	1500
+#define DEFAULT_CDP_CUR_MAX	5000
+#define DEFAULT_ACA_CUR_MIN	1500
+#define DEFAULT_ACA_CUR_MAX	5000
+
+static LIST_HEAD(phy_list);
+static DEFINE_SPINLOCK(phy_lock);
+
+struct phy_devm {
+	struct usb_phy *phy;
+	struct notifier_block *nb;
+};
+
+static const char *const usb_chger_type[] = {
+	[UNKNOWN_TYPE]			= "USB_CHARGER_UNKNOWN_TYPE",
+	[SDP_TYPE]			= "USB_CHARGER_SDP_TYPE",
+	[CDP_TYPE]			= "USB_CHARGER_CDP_TYPE",
+	[DCP_TYPE]			= "USB_CHARGER_DCP_TYPE",
+	[ACA_TYPE]			= "USB_CHARGER_ACA_TYPE",
+};
+
+static const char *const usb_chger_state[] = {
+	[USB_CHARGER_DEFAULT]	= "USB_CHARGER_DEFAULT",
+	[USB_CHARGER_PRESENT]	= "USB_CHARGER_PRESENT",
+	[USB_CHARGER_ABSENT]	= "USB_CHARGER_ABSENT",
+};
+
+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);
+}
+
+static struct usb_phy *__of_usb_find_phy(struct device_node *node)
+{
+	struct usb_phy  *phy;
+
+	if (!of_device_is_available(node))
+		return ERR_PTR(-ENODEV);
+
+	list_for_each_entry(phy, &phy_list, head) {
+		if (node != phy->dev->of_node)
+			continue;
+
+		return phy;
+	}
+
+	return ERR_PTR(-EPROBE_DEFER);
+}
+
+static struct usb_phy *__device_to_usb_phy(const struct device *dev)
+{
+	struct usb_phy *usb_phy;
+
+	list_for_each_entry(usb_phy, &phy_list, head) {
+		if (usb_phy->dev == dev)
+			return usb_phy;
+	}
+
+	return NULL;
+}
+
+static void usb_phy_set_default_current(struct usb_phy *usb_phy)
+{
+	usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN;
+	usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX;
+	usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN;
+	usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX;
+	usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN;
+	usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX;
+	usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN;
+	usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX;
+}
+
+/**
+ * usb_phy_notify_charger_work - notify the USB charger state
+ * @work: the charger work to notify the USB charger state
+ *
+ * This work can be issued when USB charger state has been changed or
+ * USB charger current has been changed, then we can notify the current
+ * what can be drawn to power user and the charger state to userspace.
+ *
+ * If we get the charger type from extcon subsystem, we can notify the
+ * charger state to power user automatically by usb_phy_get_charger_type()
+ * issuing from extcon subsystem.
+ *
+ * If we get the charger type from ->charger_detect() instead of extcon
+ * subsystem, the usb phy driver should issue usb_phy_set_charger_state()
+ * to set charger state when the charger state has been changed.
+ */
+static void usb_phy_notify_charger_work(struct work_struct *work)
+{
+	struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work);
+	unsigned int min, max;
+
+	switch (usb_phy->chg_state) {
+	case USB_CHARGER_PRESENT:
+		usb_phy_get_charger_current(usb_phy, &min, &max);
+
+		atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy);
+		break;
+	case USB_CHARGER_ABSENT:
+		usb_phy_set_default_current(usb_phy);
+
+		atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy);
+		break;
+	default:
+		dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n",
+			 usb_phy->chg_state);
+		return;
+	}
+
+	kobject_uevent(&usb_phy->dev->kobj, KOBJ_CHANGE);
+}
+
+static int usb_phy_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	const struct usb_phy *usb_phy;
+	char uchger_state[50] = { 0 };
+	char uchger_type[50] = { 0 };
+	unsigned long flags;
+
+	spin_lock_irqsave(&phy_lock, flags);
+	usb_phy = __device_to_usb_phy(dev);
+	spin_unlock_irqrestore(&phy_lock, flags);
+
+	if (!usb_phy)
+		return -ENODEV;
+
+	snprintf(uchger_state, ARRAY_SIZE(uchger_state),
+		 "USB_CHARGER_STATE=%s", usb_chger_state[usb_phy->chg_state]);
+
+	snprintf(uchger_type, ARRAY_SIZE(uchger_type),
+		 "USB_CHARGER_TYPE=%s", usb_chger_type[usb_phy->chg_type]);
+
+	if (add_uevent_var(env, uchger_state))
+		return -ENOMEM;
+
+	if (add_uevent_var(env, uchger_type))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void __usb_phy_get_charger_type(struct usb_phy *usb_phy)
+{
+	if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) {
+		usb_phy->chg_type = SDP_TYPE;
+		usb_phy->chg_state = USB_CHARGER_PRESENT;
+	} else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) {
+		usb_phy->chg_type = CDP_TYPE;
+		usb_phy->chg_state = USB_CHARGER_PRESENT;
+	} else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) {
+		usb_phy->chg_type = DCP_TYPE;
+		usb_phy->chg_state = USB_CHARGER_PRESENT;
+	} else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) {
+		usb_phy->chg_type = ACA_TYPE;
+		usb_phy->chg_state = USB_CHARGER_PRESENT;
+	} else {
+		usb_phy->chg_type = UNKNOWN_TYPE;
+		usb_phy->chg_state = USB_CHARGER_ABSENT;
+	}
+
+	schedule_work(&usb_phy->chg_work);
+}
+
+/**
+ * usb_phy_get_charger_type - get charger type from extcon subsystem
+ * @nb: the notifier block to determine charger type
+ * @state: the cable state
+ * @data: private data
+ *
+ * Determin the charger type from extcon subsystem which also means the
+ * charger state has been chaned, then we should notify this event.
+ */
+static int usb_phy_get_charger_type(struct notifier_block *nb,
+				    unsigned long state, void *data)
+{
+	struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb);
+
+	__usb_phy_get_charger_type(usb_phy);
+	return NOTIFY_OK;
+}
+
+/**
+ * usb_phy_set_charger_current - set the USB charger current
+ * @usb_phy: the USB phy to be used
+ * @mA: the current need to be set
+ *
+ * Usually we only change the charger default current when USB finished the
+ * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power()
+ * will issue this function to change charger current when after setting USB
+ * configuration, or suspend/resume USB. For other type charger, we should
+ * use the default charger current and we do not suggest to issue this function
+ * to change the charger current.
+ *
+ * When USB charger current has been changed, we need to notify the power users.
+ */
+void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA)
+{
+	switch (usb_phy->chg_type) {
+	case SDP_TYPE:
+		if (usb_phy->chg_cur.sdp_max == mA)
+			return;
+
+		usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ?
+			DEFAULT_SDP_CUR_MAX_SS : mA;
+		break;
+	case DCP_TYPE:
+		if (usb_phy->chg_cur.dcp_max == mA)
+			return;
+
+		usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ?
+			DEFAULT_DCP_CUR_MAX : mA;
+		break;
+	case CDP_TYPE:
+		if (usb_phy->chg_cur.cdp_max == mA)
+			return;
+
+		usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ?
+			DEFAULT_CDP_CUR_MAX : mA;
+		break;
+	case ACA_TYPE:
+		if (usb_phy->chg_cur.aca_max == mA)
+			return;
+
+		usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ?
+			DEFAULT_ACA_CUR_MAX : mA;
+		break;
+	default:
+		return;
+	}
+
+	schedule_work(&usb_phy->chg_work);
+}
+EXPORT_SYMBOL_GPL(usb_phy_set_charger_current);
+
+/**
+ * usb_phy_get_charger_current - get the USB charger current
+ * @usb_phy: the USB phy to be used
+ * @min: the minimum current
+ * @max: the maximum current
+ *
+ * Usually we will notify the maximum current to power user, but for some
+ * special case, power user also need the minimum current value. Then the
+ * power user can issue this function to get the suitable current.
+ */
+void usb_phy_get_charger_current(struct usb_phy *usb_phy,
+				 unsigned int *min, unsigned int *max)
+{
+	switch (usb_phy->chg_type) {
+	case SDP_TYPE:
+		*min = usb_phy->chg_cur.sdp_min;
+		*max = usb_phy->chg_cur.sdp_max;
+		break;
+	case DCP_TYPE:
+		*min = usb_phy->chg_cur.dcp_min;
+		*max = usb_phy->chg_cur.dcp_max;
+		break;
+	case CDP_TYPE:
+		*min = usb_phy->chg_cur.cdp_min;
+		*max = usb_phy->chg_cur.cdp_max;
+		break;
+	case ACA_TYPE:
+		*min = usb_phy->chg_cur.aca_min;
+		*max = usb_phy->chg_cur.aca_max;
+		break;
+	default:
+		*min = 0;
+		*max = 0;
+		break;
+	}
+}
+EXPORT_SYMBOL_GPL(usb_phy_get_charger_current);
+
+/**
+ * usb_phy_set_charger_state - set the USB charger state
+ * @usb_phy: the USB phy to be used
+ * @state: the new state need to be set for charger
+ *
+ * The usb phy driver can issue this function when the usb phy driver
+ * detected the charger state has been changed, in this case the charger
+ * type should be get from ->charger_detect().
+ */
+void usb_phy_set_charger_state(struct usb_phy *usb_phy,
+			       enum usb_charger_state state)
+{
+	if (usb_phy->chg_state == state || !usb_phy->charger_detect)
+		return;
+
+	usb_phy->chg_state = state;
+	if (usb_phy->chg_state == USB_CHARGER_PRESENT)
+		usb_phy->chg_type = usb_phy->charger_detect(usb_phy);
+	else
+		usb_phy->chg_type = UNKNOWN_TYPE;
+
+	schedule_work(&usb_phy->chg_work);
+}
+EXPORT_SYMBOL_GPL(usb_phy_set_charger_state);
+
+static void devm_usb_phy_release(struct device *dev, void *res)
+{
+	struct usb_phy *phy = *(struct usb_phy **)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 void usb_charger_init(struct usb_phy *usb_phy)
+{
+	usb_phy->chg_type = UNKNOWN_TYPE;
+	usb_phy->chg_state = USB_CHARGER_DEFAULT;
+	usb_phy_set_default_current(usb_phy);
+	INIT_WORK(&usb_phy->chg_work, usb_phy_notify_charger_work);
+}
+
+static int usb_add_extcon(struct usb_phy *x)
+{
+	int ret;
+
+	if (of_property_present(x->dev->of_node, "extcon")) {
+		x->edev = extcon_get_edev_by_phandle(x->dev, 0);
+		if (IS_ERR(x->edev))
+			return PTR_ERR(x->edev);
+
+		x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
+		if (IS_ERR(x->id_edev)) {
+			x->id_edev = NULL;
+			dev_info(x->dev, "No separate ID extcon device\n");
+		}
+
+		if (x->vbus_nb.notifier_call) {
+			ret = devm_extcon_register_notifier(x->dev, x->edev,
+							    EXTCON_USB,
+							    &x->vbus_nb);
+			if (ret < 0) {
+				dev_err(x->dev,
+					"register VBUS notifier failed\n");
+				return ret;
+			}
+		} else {
+			x->type_nb.notifier_call = usb_phy_get_charger_type;
+
+			ret = devm_extcon_register_notifier(x->dev, x->edev,
+							    EXTCON_CHG_USB_SDP,
+							    &x->type_nb);
+			if (ret) {
+				dev_err(x->dev,
+					"register extcon USB SDP failed.\n");
+				return ret;
+			}
+
+			ret = devm_extcon_register_notifier(x->dev, x->edev,
+							    EXTCON_CHG_USB_CDP,
+							    &x->type_nb);
+			if (ret) {
+				dev_err(x->dev,
+					"register extcon USB CDP failed.\n");
+				return ret;
+			}
+
+			ret = devm_extcon_register_notifier(x->dev, x->edev,
+							    EXTCON_CHG_USB_DCP,
+							    &x->type_nb);
+			if (ret) {
+				dev_err(x->dev,
+					"register extcon USB DCP failed.\n");
+				return ret;
+			}
+
+			ret = devm_extcon_register_notifier(x->dev, x->edev,
+							    EXTCON_CHG_USB_ACA,
+							    &x->type_nb);
+			if (ret) {
+				dev_err(x->dev,
+					"register extcon USB ACA failed.\n");
+				return ret;
+			}
+		}
+
+		if (x->id_nb.notifier_call) {
+			struct extcon_dev *id_ext;
+
+			if (x->id_edev)
+				id_ext = x->id_edev;
+			else
+				id_ext = x->edev;
+
+			ret = devm_extcon_register_notifier(x->dev, id_ext,
+							    EXTCON_USB_HOST,
+							    &x->id_nb);
+			if (ret < 0) {
+				dev_err(x->dev,
+					"register ID notifier failed\n");
+				return ret;
+			}
+		}
+	}
+
+	if (x->type_nb.notifier_call)
+		__usb_phy_get_charger_type(x);
+
+	return 0;
+}
+
+/**
+ * devm_usb_get_phy - find the USB PHY
+ * @dev: device that requests this phy
+ * @type: the type of the phy the controller requires
+ *
+ * Gets the phy using usb_get_phy(), and associates a device with it 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(struct device *dev, enum usb_phy_type type)
+{
+	struct usb_phy **ptr, *phy;
+
+	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	phy = usb_get_phy(type);
+	if (!IS_ERR(phy)) {
+		*ptr = phy;
+		devres_add(dev, ptr);
+	} else
+		devres_free(ptr);
+
+	return phy;
+}
+EXPORT_SYMBOL_GPL(devm_usb_get_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
+ * -ENODEV if there is no such phy.  The caller is responsible for
+ * calling usb_put_phy() to release that count.
+ *
+ * For use by USB host and peripheral drivers.
+ */
+struct usb_phy *usb_get_phy(enum usb_phy_type type)
+{
+	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) || !try_module_get(phy->dev->driver->owner)) {
+		pr_debug("PHY: unable to find transceiver of type %s\n",
+			usb_phy_type_string(type));
+		if (!IS_ERR(phy))
+			phy = ERR_PTR(-ENODEV);
+
+		goto err0;
+	}
+
+	get_device(phy->dev);
+
+err0:
+	spin_unlock_irqrestore(&phy_lock, flags);
+
+	return phy;
+}
+EXPORT_SYMBOL_GPL(usb_get_phy);
+
+/**
+ * devm_usb_get_phy_by_node - find the USB PHY by device_node
+ * @dev: device that requests this 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 device_node,
+ * after getting a refcount to it, -ENODEV if there is no such phy or
+ * -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 peripheral drivers for devices related to a phy,
+ * such as a charger.
+ */
+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);
+	struct phy_devm	*ptr;
+	unsigned long	flags;
+
+	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;
+	}
+
+	spin_lock_irqsave(&phy_lock, flags);
+
+	phy = __of_usb_find_phy(node);
+	if (IS_ERR(phy)) {
+		devres_free(ptr);
+		goto err1;
+	}
+
+	if (!try_module_get(phy->dev->driver->owner)) {
+		phy = ERR_PTR(-ENODEV);
+		devres_free(ptr);
+		goto err1;
+	}
+	if (nb)
+		usb_register_notifier(phy, nb);
+	ptr->phy = phy;
+	ptr->nb = nb;
+	devres_add(dev, ptr);
+
+	get_device(phy->dev);
+
+err1:
+	spin_unlock_irqrestore(&phy_lock, flags);
+
+err0:
+
+	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 %pOF node\n", phandle,
+			dev->of_node);
+		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);
+
+/**
+ * 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().
+ *
+ * For use by USB host and peripheral drivers.
+ */
+void usb_put_phy(struct usb_phy *x)
+{
+	if (x) {
+		struct module *owner = x->dev->driver->owner;
+
+		put_device(x->dev);
+		module_put(owner);
+	}
+}
+EXPORT_SYMBOL_GPL(usb_put_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, enum usb_phy_type type)
+{
+	int		ret = 0;
+	unsigned long	flags;
+	struct usb_phy	*phy;
+
+	if (x->type != USB_PHY_TYPE_UNDEFINED) {
+		dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
+		return -EINVAL;
+	}
+
+	INIT_LIST_HEAD(&x->head);
+
+	usb_charger_init(x);
+	ret = usb_add_extcon(x);
+	if (ret)
+		return ret;
+
+	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
+
+	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_GPL(usb_add_phy);
+
+static const struct device_type usb_phy_dev_type = {
+	.name = "usb_phy",
+	.uevent = usb_phy_uevent,
+};
+
+/**
+ * usb_add_phy_dev - declare the USB PHY
+ * @x: the USB phy to be used; or NULL
+ *
+ * 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_dev(struct usb_phy *x)
+{
+	unsigned long flags;
+	int ret;
+
+	if (!x->dev) {
+		dev_err(x->dev, "no device provided for PHY\n");
+		return -EINVAL;
+	}
+
+	INIT_LIST_HEAD(&x->head);
+
+	usb_charger_init(x);
+	ret = usb_add_extcon(x);
+	if (ret)
+		return ret;
+
+	x->dev->type = &usb_phy_dev_type;
+
+	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
+
+	spin_lock_irqsave(&phy_lock, flags);
+	list_add_tail(&x->head, &phy_list);
+	spin_unlock_irqrestore(&phy_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_add_phy_dev);
+
+/**
+ * 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_GPL(usb_remove_phy);
+
+/**
+ * usb_phy_set_event - set event to phy event
+ * @x: the phy returned by usb_get_phy();
+ * @event: event to set
+ *
+ * This sets event to phy event
+ */
+void usb_phy_set_event(struct usb_phy *x, unsigned long event)
+{
+	x->last_event = event;
+}
+EXPORT_SYMBOL_GPL(usb_phy_set_event);