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-rw-r--r--drivers/base/power/clock_ops.c805
1 files changed, 805 insertions, 0 deletions
diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
new file mode 100644
index 0000000000..4110c19c08
--- /dev/null
+++ b/drivers/base/power/clock_ops.c
@@ -0,0 +1,805 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * drivers/base/power/clock_ops.c - Generic clock manipulation PM callbacks
+ *
+ * Copyright (c) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/pm.h>
+#include <linux/pm_clock.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/of_clk.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+
+#ifdef CONFIG_PM_CLK
+
+enum pce_status {
+ PCE_STATUS_NONE = 0,
+ PCE_STATUS_ACQUIRED,
+ PCE_STATUS_PREPARED,
+ PCE_STATUS_ENABLED,
+ PCE_STATUS_ERROR,
+};
+
+struct pm_clock_entry {
+ struct list_head node;
+ char *con_id;
+ struct clk *clk;
+ enum pce_status status;
+ bool enabled_when_prepared;
+};
+
+/**
+ * pm_clk_list_lock - ensure exclusive access for modifying the PM clock
+ * entry list.
+ * @psd: pm_subsys_data instance corresponding to the PM clock entry list
+ * and clk_op_might_sleep count to be modified.
+ *
+ * Get exclusive access before modifying the PM clock entry list and the
+ * clock_op_might_sleep count to guard against concurrent modifications.
+ * This also protects against a concurrent clock_op_might_sleep and PM clock
+ * entry list usage in pm_clk_suspend()/pm_clk_resume() that may or may not
+ * happen in atomic context, hence both the mutex and the spinlock must be
+ * taken here.
+ */
+static void pm_clk_list_lock(struct pm_subsys_data *psd)
+ __acquires(&psd->lock)
+{
+ mutex_lock(&psd->clock_mutex);
+ spin_lock_irq(&psd->lock);
+}
+
+/**
+ * pm_clk_list_unlock - counterpart to pm_clk_list_lock().
+ * @psd: the same pm_subsys_data instance previously passed to
+ * pm_clk_list_lock().
+ */
+static void pm_clk_list_unlock(struct pm_subsys_data *psd)
+ __releases(&psd->lock)
+{
+ spin_unlock_irq(&psd->lock);
+ mutex_unlock(&psd->clock_mutex);
+}
+
+/**
+ * pm_clk_op_lock - ensure exclusive access for performing clock operations.
+ * @psd: pm_subsys_data instance corresponding to the PM clock entry list
+ * and clk_op_might_sleep count being used.
+ * @flags: stored irq flags.
+ * @fn: string for the caller function's name.
+ *
+ * This is used by pm_clk_suspend() and pm_clk_resume() to guard
+ * against concurrent modifications to the clock entry list and the
+ * clock_op_might_sleep count. If clock_op_might_sleep is != 0 then
+ * only the mutex can be locked and those functions can only be used in
+ * non atomic context. If clock_op_might_sleep == 0 then these functions
+ * may be used in any context and only the spinlock can be locked.
+ * Returns -EINVAL if called in atomic context when clock ops might sleep.
+ */
+static int pm_clk_op_lock(struct pm_subsys_data *psd, unsigned long *flags,
+ const char *fn)
+ /* sparse annotations don't work here as exit state isn't static */
+{
+ bool atomic_context = in_atomic() || irqs_disabled();
+
+try_again:
+ spin_lock_irqsave(&psd->lock, *flags);
+ if (!psd->clock_op_might_sleep) {
+ /* the __release is there to work around sparse limitations */
+ __release(&psd->lock);
+ return 0;
+ }
+
+ /* bail out if in atomic context */
+ if (atomic_context) {
+ pr_err("%s: atomic context with clock_ops_might_sleep = %d",
+ fn, psd->clock_op_might_sleep);
+ spin_unlock_irqrestore(&psd->lock, *flags);
+ might_sleep();
+ return -EPERM;
+ }
+
+ /* we must switch to the mutex */
+ spin_unlock_irqrestore(&psd->lock, *flags);
+ mutex_lock(&psd->clock_mutex);
+
+ /*
+ * There was a possibility for psd->clock_op_might_sleep
+ * to become 0 above. Keep the mutex only if not the case.
+ */
+ if (likely(psd->clock_op_might_sleep))
+ return 0;
+
+ mutex_unlock(&psd->clock_mutex);
+ goto try_again;
+}
+
+/**
+ * pm_clk_op_unlock - counterpart to pm_clk_op_lock().
+ * @psd: the same pm_subsys_data instance previously passed to
+ * pm_clk_op_lock().
+ * @flags: irq flags provided by pm_clk_op_lock().
+ */
+static void pm_clk_op_unlock(struct pm_subsys_data *psd, unsigned long *flags)
+ /* sparse annotations don't work here as entry state isn't static */
+{
+ if (psd->clock_op_might_sleep) {
+ mutex_unlock(&psd->clock_mutex);
+ } else {
+ /* the __acquire is there to work around sparse limitations */
+ __acquire(&psd->lock);
+ spin_unlock_irqrestore(&psd->lock, *flags);
+ }
+}
+
+/**
+ * __pm_clk_enable - Enable a clock, reporting any errors
+ * @dev: The device for the given clock
+ * @ce: PM clock entry corresponding to the clock.
+ */
+static inline void __pm_clk_enable(struct device *dev, struct pm_clock_entry *ce)
+{
+ int ret;
+
+ switch (ce->status) {
+ case PCE_STATUS_ACQUIRED:
+ ret = clk_prepare_enable(ce->clk);
+ break;
+ case PCE_STATUS_PREPARED:
+ ret = clk_enable(ce->clk);
+ break;
+ default:
+ return;
+ }
+ if (!ret)
+ ce->status = PCE_STATUS_ENABLED;
+ else
+ dev_err(dev, "%s: failed to enable clk %p, error %d\n",
+ __func__, ce->clk, ret);
+}
+
+/**
+ * pm_clk_acquire - Acquire a device clock.
+ * @dev: Device whose clock is to be acquired.
+ * @ce: PM clock entry corresponding to the clock.
+ */
+static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
+{
+ if (!ce->clk)
+ ce->clk = clk_get(dev, ce->con_id);
+ if (IS_ERR(ce->clk)) {
+ ce->status = PCE_STATUS_ERROR;
+ return;
+ } else if (clk_is_enabled_when_prepared(ce->clk)) {
+ /* we defer preparing the clock in that case */
+ ce->status = PCE_STATUS_ACQUIRED;
+ ce->enabled_when_prepared = true;
+ } else if (clk_prepare(ce->clk)) {
+ ce->status = PCE_STATUS_ERROR;
+ dev_err(dev, "clk_prepare() failed\n");
+ return;
+ } else {
+ ce->status = PCE_STATUS_PREPARED;
+ }
+ dev_dbg(dev, "Clock %pC con_id %s managed by runtime PM.\n",
+ ce->clk, ce->con_id);
+}
+
+static int __pm_clk_add(struct device *dev, const char *con_id,
+ struct clk *clk)
+{
+ struct pm_subsys_data *psd = dev_to_psd(dev);
+ struct pm_clock_entry *ce;
+
+ if (!psd)
+ return -EINVAL;
+
+ ce = kzalloc(sizeof(*ce), GFP_KERNEL);
+ if (!ce)
+ return -ENOMEM;
+
+ if (con_id) {
+ ce->con_id = kstrdup(con_id, GFP_KERNEL);
+ if (!ce->con_id) {
+ kfree(ce);
+ return -ENOMEM;
+ }
+ } else {
+ if (IS_ERR(clk)) {
+ kfree(ce);
+ return -ENOENT;
+ }
+ ce->clk = clk;
+ }
+
+ pm_clk_acquire(dev, ce);
+
+ pm_clk_list_lock(psd);
+ list_add_tail(&ce->node, &psd->clock_list);
+ if (ce->enabled_when_prepared)
+ psd->clock_op_might_sleep++;
+ pm_clk_list_unlock(psd);
+ return 0;
+}
+
+/**
+ * pm_clk_add - Start using a device clock for power management.
+ * @dev: Device whose clock is going to be used for power management.
+ * @con_id: Connection ID of the clock.
+ *
+ * Add the clock represented by @con_id to the list of clocks used for
+ * the power management of @dev.
+ */
+int pm_clk_add(struct device *dev, const char *con_id)
+{
+ return __pm_clk_add(dev, con_id, NULL);
+}
+EXPORT_SYMBOL_GPL(pm_clk_add);
+
+/**
+ * pm_clk_add_clk - Start using a device clock for power management.
+ * @dev: Device whose clock is going to be used for power management.
+ * @clk: Clock pointer
+ *
+ * Add the clock to the list of clocks used for the power management of @dev.
+ * The power-management code will take control of the clock reference, so
+ * callers should not call clk_put() on @clk after this function sucessfully
+ * returned.
+ */
+int pm_clk_add_clk(struct device *dev, struct clk *clk)
+{
+ return __pm_clk_add(dev, NULL, clk);
+}
+EXPORT_SYMBOL_GPL(pm_clk_add_clk);
+
+
+/**
+ * of_pm_clk_add_clk - Start using a device clock for power management.
+ * @dev: Device whose clock is going to be used for power management.
+ * @name: Name of clock that is going to be used for power management.
+ *
+ * Add the clock described in the 'clocks' device-tree node that matches
+ * with the 'name' provided, to the list of clocks used for the power
+ * management of @dev. On success, returns 0. Returns a negative error
+ * code if the clock is not found or cannot be added.
+ */
+int of_pm_clk_add_clk(struct device *dev, const char *name)
+{
+ struct clk *clk;
+ int ret;
+
+ if (!dev || !dev->of_node || !name)
+ return -EINVAL;
+
+ clk = of_clk_get_by_name(dev->of_node, name);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ ret = pm_clk_add_clk(dev, clk);
+ if (ret) {
+ clk_put(clk);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_pm_clk_add_clk);
+
+/**
+ * of_pm_clk_add_clks - Start using device clock(s) for power management.
+ * @dev: Device whose clock(s) is going to be used for power management.
+ *
+ * Add a series of clocks described in the 'clocks' device-tree node for
+ * a device to the list of clocks used for the power management of @dev.
+ * On success, returns the number of clocks added. Returns a negative
+ * error code if there are no clocks in the device node for the device
+ * or if adding a clock fails.
+ */
+int of_pm_clk_add_clks(struct device *dev)
+{
+ struct clk **clks;
+ int i, count;
+ int ret;
+
+ if (!dev || !dev->of_node)
+ return -EINVAL;
+
+ count = of_clk_get_parent_count(dev->of_node);
+ if (count <= 0)
+ return -ENODEV;
+
+ clks = kcalloc(count, sizeof(*clks), GFP_KERNEL);
+ if (!clks)
+ return -ENOMEM;
+
+ for (i = 0; i < count; i++) {
+ clks[i] = of_clk_get(dev->of_node, i);
+ if (IS_ERR(clks[i])) {
+ ret = PTR_ERR(clks[i]);
+ goto error;
+ }
+
+ ret = pm_clk_add_clk(dev, clks[i]);
+ if (ret) {
+ clk_put(clks[i]);
+ goto error;
+ }
+ }
+
+ kfree(clks);
+
+ return i;
+
+error:
+ while (i--)
+ pm_clk_remove_clk(dev, clks[i]);
+
+ kfree(clks);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_pm_clk_add_clks);
+
+/**
+ * __pm_clk_remove - Destroy PM clock entry.
+ * @ce: PM clock entry to destroy.
+ */
+static void __pm_clk_remove(struct pm_clock_entry *ce)
+{
+ if (!ce)
+ return;
+
+ switch (ce->status) {
+ case PCE_STATUS_ENABLED:
+ clk_disable(ce->clk);
+ fallthrough;
+ case PCE_STATUS_PREPARED:
+ clk_unprepare(ce->clk);
+ fallthrough;
+ case PCE_STATUS_ACQUIRED:
+ case PCE_STATUS_ERROR:
+ if (!IS_ERR(ce->clk))
+ clk_put(ce->clk);
+ break;
+ default:
+ break;
+ }
+
+ kfree(ce->con_id);
+ kfree(ce);
+}
+
+/**
+ * pm_clk_remove - Stop using a device clock for power management.
+ * @dev: Device whose clock should not be used for PM any more.
+ * @con_id: Connection ID of the clock.
+ *
+ * Remove the clock represented by @con_id from the list of clocks used for
+ * the power management of @dev.
+ */
+void pm_clk_remove(struct device *dev, const char *con_id)
+{
+ struct pm_subsys_data *psd = dev_to_psd(dev);
+ struct pm_clock_entry *ce;
+
+ if (!psd)
+ return;
+
+ pm_clk_list_lock(psd);
+
+ list_for_each_entry(ce, &psd->clock_list, node) {
+ if (!con_id && !ce->con_id)
+ goto remove;
+ else if (!con_id || !ce->con_id)
+ continue;
+ else if (!strcmp(con_id, ce->con_id))
+ goto remove;
+ }
+
+ pm_clk_list_unlock(psd);
+ return;
+
+ remove:
+ list_del(&ce->node);
+ if (ce->enabled_when_prepared)
+ psd->clock_op_might_sleep--;
+ pm_clk_list_unlock(psd);
+
+ __pm_clk_remove(ce);
+}
+EXPORT_SYMBOL_GPL(pm_clk_remove);
+
+/**
+ * pm_clk_remove_clk - Stop using a device clock for power management.
+ * @dev: Device whose clock should not be used for PM any more.
+ * @clk: Clock pointer
+ *
+ * Remove the clock pointed to by @clk from the list of clocks used for
+ * the power management of @dev.
+ */
+void pm_clk_remove_clk(struct device *dev, struct clk *clk)
+{
+ struct pm_subsys_data *psd = dev_to_psd(dev);
+ struct pm_clock_entry *ce;
+
+ if (!psd || !clk)
+ return;
+
+ pm_clk_list_lock(psd);
+
+ list_for_each_entry(ce, &psd->clock_list, node) {
+ if (clk == ce->clk)
+ goto remove;
+ }
+
+ pm_clk_list_unlock(psd);
+ return;
+
+ remove:
+ list_del(&ce->node);
+ if (ce->enabled_when_prepared)
+ psd->clock_op_might_sleep--;
+ pm_clk_list_unlock(psd);
+
+ __pm_clk_remove(ce);
+}
+EXPORT_SYMBOL_GPL(pm_clk_remove_clk);
+
+/**
+ * pm_clk_init - Initialize a device's list of power management clocks.
+ * @dev: Device to initialize the list of PM clocks for.
+ *
+ * Initialize the lock and clock_list members of the device's pm_subsys_data
+ * object, set the count of clocks that might sleep to 0.
+ */
+void pm_clk_init(struct device *dev)
+{
+ struct pm_subsys_data *psd = dev_to_psd(dev);
+ if (psd) {
+ INIT_LIST_HEAD(&psd->clock_list);
+ mutex_init(&psd->clock_mutex);
+ psd->clock_op_might_sleep = 0;
+ }
+}
+EXPORT_SYMBOL_GPL(pm_clk_init);
+
+/**
+ * pm_clk_create - Create and initialize a device's list of PM clocks.
+ * @dev: Device to create and initialize the list of PM clocks for.
+ *
+ * Allocate a struct pm_subsys_data object, initialize its lock and clock_list
+ * members and make the @dev's power.subsys_data field point to it.
+ */
+int pm_clk_create(struct device *dev)
+{
+ return dev_pm_get_subsys_data(dev);
+}
+EXPORT_SYMBOL_GPL(pm_clk_create);
+
+/**
+ * pm_clk_destroy - Destroy a device's list of power management clocks.
+ * @dev: Device to destroy the list of PM clocks for.
+ *
+ * Clear the @dev's power.subsys_data field, remove the list of clock entries
+ * from the struct pm_subsys_data object pointed to by it before and free
+ * that object.
+ */
+void pm_clk_destroy(struct device *dev)
+{
+ struct pm_subsys_data *psd = dev_to_psd(dev);
+ struct pm_clock_entry *ce, *c;
+ struct list_head list;
+
+ if (!psd)
+ return;
+
+ INIT_LIST_HEAD(&list);
+
+ pm_clk_list_lock(psd);
+
+ list_for_each_entry_safe_reverse(ce, c, &psd->clock_list, node)
+ list_move(&ce->node, &list);
+ psd->clock_op_might_sleep = 0;
+
+ pm_clk_list_unlock(psd);
+
+ dev_pm_put_subsys_data(dev);
+
+ list_for_each_entry_safe_reverse(ce, c, &list, node) {
+ list_del(&ce->node);
+ __pm_clk_remove(ce);
+ }
+}
+EXPORT_SYMBOL_GPL(pm_clk_destroy);
+
+static void pm_clk_destroy_action(void *data)
+{
+ pm_clk_destroy(data);
+}
+
+int devm_pm_clk_create(struct device *dev)
+{
+ int ret;
+
+ ret = pm_clk_create(dev);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(dev, pm_clk_destroy_action, dev);
+}
+EXPORT_SYMBOL_GPL(devm_pm_clk_create);
+
+/**
+ * pm_clk_suspend - Disable clocks in a device's PM clock list.
+ * @dev: Device to disable the clocks for.
+ */
+int pm_clk_suspend(struct device *dev)
+{
+ struct pm_subsys_data *psd = dev_to_psd(dev);
+ struct pm_clock_entry *ce;
+ unsigned long flags;
+ int ret;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ if (!psd)
+ return 0;
+
+ ret = pm_clk_op_lock(psd, &flags, __func__);
+ if (ret)
+ return ret;
+
+ list_for_each_entry_reverse(ce, &psd->clock_list, node) {
+ if (ce->status == PCE_STATUS_ENABLED) {
+ if (ce->enabled_when_prepared) {
+ clk_disable_unprepare(ce->clk);
+ ce->status = PCE_STATUS_ACQUIRED;
+ } else {
+ clk_disable(ce->clk);
+ ce->status = PCE_STATUS_PREPARED;
+ }
+ }
+ }
+
+ pm_clk_op_unlock(psd, &flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pm_clk_suspend);
+
+/**
+ * pm_clk_resume - Enable clocks in a device's PM clock list.
+ * @dev: Device to enable the clocks for.
+ */
+int pm_clk_resume(struct device *dev)
+{
+ struct pm_subsys_data *psd = dev_to_psd(dev);
+ struct pm_clock_entry *ce;
+ unsigned long flags;
+ int ret;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ if (!psd)
+ return 0;
+
+ ret = pm_clk_op_lock(psd, &flags, __func__);
+ if (ret)
+ return ret;
+
+ list_for_each_entry(ce, &psd->clock_list, node)
+ __pm_clk_enable(dev, ce);
+
+ pm_clk_op_unlock(psd, &flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pm_clk_resume);
+
+/**
+ * pm_clk_notify - Notify routine for device addition and removal.
+ * @nb: Notifier block object this function is a member of.
+ * @action: Operation being carried out by the caller.
+ * @data: Device the routine is being run for.
+ *
+ * For this function to work, @nb must be a member of an object of type
+ * struct pm_clk_notifier_block containing all of the requisite data.
+ * Specifically, the pm_domain member of that object is copied to the device's
+ * pm_domain field and its con_ids member is used to populate the device's list
+ * of PM clocks, depending on @action.
+ *
+ * If the device's pm_domain field is already populated with a value different
+ * from the one stored in the struct pm_clk_notifier_block object, the function
+ * does nothing.
+ */
+static int pm_clk_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct pm_clk_notifier_block *clknb;
+ struct device *dev = data;
+ char **con_id;
+ int error;
+
+ dev_dbg(dev, "%s() %ld\n", __func__, action);
+
+ clknb = container_of(nb, struct pm_clk_notifier_block, nb);
+
+ switch (action) {
+ case BUS_NOTIFY_ADD_DEVICE:
+ if (dev->pm_domain)
+ break;
+
+ error = pm_clk_create(dev);
+ if (error)
+ break;
+
+ dev_pm_domain_set(dev, clknb->pm_domain);
+ if (clknb->con_ids[0]) {
+ for (con_id = clknb->con_ids; *con_id; con_id++)
+ pm_clk_add(dev, *con_id);
+ } else {
+ pm_clk_add(dev, NULL);
+ }
+
+ break;
+ case BUS_NOTIFY_DEL_DEVICE:
+ if (dev->pm_domain != clknb->pm_domain)
+ break;
+
+ dev_pm_domain_set(dev, NULL);
+ pm_clk_destroy(dev);
+ break;
+ }
+
+ return 0;
+}
+
+int pm_clk_runtime_suspend(struct device *dev)
+{
+ int ret;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ ret = pm_generic_runtime_suspend(dev);
+ if (ret) {
+ dev_err(dev, "failed to suspend device\n");
+ return ret;
+ }
+
+ ret = pm_clk_suspend(dev);
+ if (ret) {
+ dev_err(dev, "failed to suspend clock\n");
+ pm_generic_runtime_resume(dev);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pm_clk_runtime_suspend);
+
+int pm_clk_runtime_resume(struct device *dev)
+{
+ int ret;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ ret = pm_clk_resume(dev);
+ if (ret) {
+ dev_err(dev, "failed to resume clock\n");
+ return ret;
+ }
+
+ return pm_generic_runtime_resume(dev);
+}
+EXPORT_SYMBOL_GPL(pm_clk_runtime_resume);
+
+#else /* !CONFIG_PM_CLK */
+
+/**
+ * enable_clock - Enable a device clock.
+ * @dev: Device whose clock is to be enabled.
+ * @con_id: Connection ID of the clock.
+ */
+static void enable_clock(struct device *dev, const char *con_id)
+{
+ struct clk *clk;
+
+ clk = clk_get(dev, con_id);
+ if (!IS_ERR(clk)) {
+ clk_prepare_enable(clk);
+ clk_put(clk);
+ dev_info(dev, "Runtime PM disabled, clock forced on.\n");
+ }
+}
+
+/**
+ * disable_clock - Disable a device clock.
+ * @dev: Device whose clock is to be disabled.
+ * @con_id: Connection ID of the clock.
+ */
+static void disable_clock(struct device *dev, const char *con_id)
+{
+ struct clk *clk;
+
+ clk = clk_get(dev, con_id);
+ if (!IS_ERR(clk)) {
+ clk_disable_unprepare(clk);
+ clk_put(clk);
+ dev_info(dev, "Runtime PM disabled, clock forced off.\n");
+ }
+}
+
+/**
+ * pm_clk_notify - Notify routine for device addition and removal.
+ * @nb: Notifier block object this function is a member of.
+ * @action: Operation being carried out by the caller.
+ * @data: Device the routine is being run for.
+ *
+ * For this function to work, @nb must be a member of an object of type
+ * struct pm_clk_notifier_block containing all of the requisite data.
+ * Specifically, the con_ids member of that object is used to enable or disable
+ * the device's clocks, depending on @action.
+ */
+static int pm_clk_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct pm_clk_notifier_block *clknb;
+ struct device *dev = data;
+ char **con_id;
+
+ dev_dbg(dev, "%s() %ld\n", __func__, action);
+
+ clknb = container_of(nb, struct pm_clk_notifier_block, nb);
+
+ switch (action) {
+ case BUS_NOTIFY_BIND_DRIVER:
+ if (clknb->con_ids[0]) {
+ for (con_id = clknb->con_ids; *con_id; con_id++)
+ enable_clock(dev, *con_id);
+ } else {
+ enable_clock(dev, NULL);
+ }
+ break;
+ case BUS_NOTIFY_DRIVER_NOT_BOUND:
+ case BUS_NOTIFY_UNBOUND_DRIVER:
+ if (clknb->con_ids[0]) {
+ for (con_id = clknb->con_ids; *con_id; con_id++)
+ disable_clock(dev, *con_id);
+ } else {
+ disable_clock(dev, NULL);
+ }
+ break;
+ }
+
+ return 0;
+}
+
+#endif /* !CONFIG_PM_CLK */
+
+/**
+ * pm_clk_add_notifier - Add bus type notifier for power management clocks.
+ * @bus: Bus type to add the notifier to.
+ * @clknb: Notifier to be added to the given bus type.
+ *
+ * The nb member of @clknb is not expected to be initialized and its
+ * notifier_call member will be replaced with pm_clk_notify(). However,
+ * the remaining members of @clknb should be populated prior to calling this
+ * routine.
+ */
+void pm_clk_add_notifier(struct bus_type *bus,
+ struct pm_clk_notifier_block *clknb)
+{
+ if (!bus || !clknb)
+ return;
+
+ clknb->nb.notifier_call = pm_clk_notify;
+ bus_register_notifier(bus, &clknb->nb);
+}
+EXPORT_SYMBOL_GPL(pm_clk_add_notifier);