Merge branches 'pm-devfreq' and 'pm-opp'

Merge devfreq and OPP (Operating Performance Points) updates for 6.14:

- Clean up the Exynos devfreq driver and devfreq core (Markus Elfring,
Jeongjun Park).

- Minor cleanups and fixes for OPP (Dan Carpenter, Neil Armstrong, Joe
Hattori).

- Implement dev_pm_opp_get_bw() (Neil Armstrong).

- Expose OPP reference counting helpers for Rust (Viresh Kumar).

* pm-devfreq:
PM / devfreq: exynos: remove unused function parameter
PM / devfreq: event: Call of_node_put() only once in devfreq_event_get_edev_by_phandle()

* pm-opp:
PM / OPP: Add reference counting helpers for Rust implementation
OPP: OF: Fix an OF node leak in _opp_add_static_v2()
OPP: fix dev_pm_opp_find_bw_*() when bandwidth table not initialized
OPP: add index check to assert to avoid buffer overflow in _read_freq()
opp: core: Fix off by one in dev_pm_opp_get_bw()
opp: core: implement dev_pm_opp_get_bw

drivers/devfreq/devfreq-event.c

···
 	edev = NULL;
 out:
 	mutex_unlock(&devfreq_event_list_lock);
-
-	if (!edev) {
-		of_node_put(node);
-		return ERR_PTR(-ENODEV);
-	}
-
 	of_node_put(node);
+	if (!edev)
+		return ERR_PTR(-ENODEV);
 
 	return edev;
 }

drivers/devfreq/exynos-bus.c

···
 	return ret;
 }
 
-static int exynos_bus_parse_of(struct device_node *np,
-			      struct exynos_bus *bus)
+static int exynos_bus_parse_of(struct exynos_bus *bus)
 {
 	struct device *dev = bus->dev;
 	struct dev_pm_opp *opp;
···
 	}
 
 	/* Parse the device-tree to get the resource information */
-	ret = exynos_bus_parse_of(np, bus);
+	ret = exynos_bus_parse_of(bus);
 	if (ret < 0)
 		goto err_reg;
 

drivers/opp/core.c

···
  * representation in the OPP table and manage the clock configuration themselves
  * in an platform specific way.
  */
-static bool assert_single_clk(struct opp_table *opp_table)
+static bool assert_single_clk(struct opp_table *opp_table,
+			      unsigned int __always_unused index)
 {
 	return !WARN_ON(opp_table->clk_count > 1);
 }
+
+/*
+ * Returns true if clock table is large enough to contain the clock index.
+ */
+static bool assert_clk_index(struct opp_table *opp_table,
+			     unsigned int index)
+{
+	return opp_table->clk_count > index;
+}
+
+/*
+ * Returns true if bandwidth table is large enough to contain the bandwidth index.
+ */
+static bool assert_bandwidth_index(struct opp_table *opp_table,
+				   unsigned int index)
+{
+	return opp_table->path_count > index;
+}
+
+/**
+ * dev_pm_opp_get_bw() - Gets the bandwidth corresponding to an opp
+ * @opp:	opp for which bandwidth has to be returned for
+ * @peak:	select peak or average bandwidth
+ * @index:	bandwidth index
+ *
+ * Return: bandwidth in kBps, else return 0
+ */
+unsigned long dev_pm_opp_get_bw(struct dev_pm_opp *opp, bool peak, int index)
+{
+	if (IS_ERR_OR_NULL(opp)) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return 0;
+	}
+
+	if (index >= opp->opp_table->path_count)
+		return 0;
+
+	if (!opp->bandwidth)
+		return 0;
+
+	return peak ? opp->bandwidth[index].peak : opp->bandwidth[index].avg;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_bw);
 
 /**
  * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
···
 		unsigned long (*read)(struct dev_pm_opp *opp, int index),
 		bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
 				unsigned long opp_key, unsigned long key),
-		bool (*assert)(struct opp_table *opp_table))
+		bool (*assert)(struct opp_table *opp_table, unsigned int index))
 {
 	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
 
 	/* Assert that the requirement is met */
-	if (assert && !assert(opp_table))
+	if (assert && !assert(opp_table, index))
 		return ERR_PTR(-EINVAL);
 
 	mutex_lock(&opp_table->lock);
···
 	  unsigned long (*read)(struct dev_pm_opp *opp, int index),
 	  bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
 			  unsigned long opp_key, unsigned long key),
-	  bool (*assert)(struct opp_table *opp_table))
+	  bool (*assert)(struct opp_table *opp_table, unsigned int index))
 {
 	struct opp_table *opp_table;
 	struct dev_pm_opp *opp;
···
 static struct dev_pm_opp *_find_key_exact(struct device *dev,
 		unsigned long key, int index, bool available,
 		unsigned long (*read)(struct dev_pm_opp *opp, int index),
-		bool (*assert)(struct opp_table *opp_table))
+		bool (*assert)(struct opp_table *opp_table, unsigned int index))
 {
 	/*
 	 * The value of key will be updated here, but will be ignored as the
···
 static struct dev_pm_opp *_opp_table_find_key_ceil(struct opp_table *opp_table,
 		unsigned long *key, int index, bool available,
 		unsigned long (*read)(struct dev_pm_opp *opp, int index),
-		bool (*assert)(struct opp_table *opp_table))
+		bool (*assert)(struct opp_table *opp_table, unsigned int index))
 {
 	return _opp_table_find_key(opp_table, key, index, available, read,
 				   _compare_ceil, assert);
···
 static struct dev_pm_opp *_find_key_ceil(struct device *dev, unsigned long *key,
 		int index, bool available,
 		unsigned long (*read)(struct dev_pm_opp *opp, int index),
-		bool (*assert)(struct opp_table *opp_table))
+		bool (*assert)(struct opp_table *opp_table, unsigned int index))
 {
 	return _find_key(dev, key, index, available, read, _compare_ceil,
 			 assert);
···
 static struct dev_pm_opp *_find_key_floor(struct device *dev,
 		unsigned long *key, int index, bool available,
 		unsigned long (*read)(struct dev_pm_opp *opp, int index),
-		bool (*assert)(struct opp_table *opp_table))
+		bool (*assert)(struct opp_table *opp_table, unsigned int index))
 {
 	return _find_key(dev, key, index, available, read, _compare_floor,
 			 assert);
···
 dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq,
 				   u32 index, bool available)
 {
-	return _find_key_exact(dev, freq, index, available, _read_freq, NULL);
+	return _find_key_exact(dev, freq, index, available, _read_freq,
+			       assert_clk_index);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact_indexed);
 
···
 dev_pm_opp_find_freq_ceil_indexed(struct device *dev, unsigned long *freq,
 				  u32 index)
 {
-	return _find_key_ceil(dev, freq, index, true, _read_freq, NULL);
+	return _find_key_ceil(dev, freq, index, true, _read_freq,
+			      assert_clk_index);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_indexed);
 
···
 dev_pm_opp_find_freq_floor_indexed(struct device *dev, unsigned long *freq,
 				   u32 index)
 {
-	return _find_key_floor(dev, freq, index, true, _read_freq, NULL);
+	return _find_key_floor(dev, freq, index, true, _read_freq, assert_clk_index);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor_indexed);
 
···
 	unsigned long temp = *bw;
 	struct dev_pm_opp *opp;
 
-	opp = _find_key_ceil(dev, &temp, index, true, _read_bw, NULL);
+	opp = _find_key_ceil(dev, &temp, index, true, _read_bw,
+			     assert_bandwidth_index);
 	*bw = temp;
 	return opp;
 }
···
 	unsigned long temp = *bw;
 	struct dev_pm_opp *opp;
 
-	opp = _find_key_floor(dev, &temp, index, true, _read_bw, NULL);
+	opp = _find_key_floor(dev, &temp, index, true, _read_bw,
+			      assert_bandwidth_index);
 	*bw = temp;
 	return opp;
 }
···
 	return ERR_PTR(ret);
 }
 
-void _get_opp_table_kref(struct opp_table *opp_table)
-{
-	kref_get(&opp_table->kref);
-}
-
 static struct opp_table *_update_opp_table_clk(struct device *dev,
 					       struct opp_table *opp_table,
 					       bool getclk)
···
 	kfree(opp_table);
 }
 
+void _get_opp_table_kref(struct opp_table *opp_table)
+{
+	kref_get(&opp_table->kref);
+}
+
+void dev_pm_opp_get_opp_table_ref(struct opp_table *opp_table)
+{
+	_get_opp_table_kref(opp_table);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table_ref);
+
 void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
 {
 	kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
···
 {
 	kref_get(&opp->kref);
 }
+EXPORT_SYMBOL_GPL(dev_pm_opp_get);
 
 void dev_pm_opp_put(struct dev_pm_opp *opp)
 {
···
 	if (IS_ERR(opp_table))
 		return;
 
-	if (!assert_single_clk(opp_table))
+	if (!assert_single_clk(opp_table, 0))
 		goto put_table;
 
 	mutex_lock(&opp_table->lock);
···
 	unsigned long tol, u_volt = data->u_volt;
 	int ret;
 
-	if (!assert_single_clk(opp_table))
+	if (!assert_single_clk(opp_table, 0))
 		return -EINVAL;
 
 	new_opp = _opp_allocate(opp_table);
···
 		return r;
 	}
 
-	if (!assert_single_clk(opp_table)) {
+	if (!assert_single_clk(opp_table, 0)) {
 		r = -EINVAL;
 		goto put_table;
 	}
···
 		return r;
 	}
 
-	if (!assert_single_clk(opp_table)) {
+	if (!assert_single_clk(opp_table, 0)) {
 		r = -EINVAL;
 		goto put_table;
 	}

drivers/opp/of.c

···
 
 	ret = _of_opp_alloc_required_opps(opp_table, new_opp);
 	if (ret)
-		goto free_opp;
+		goto put_node;
 
 	if (!of_property_read_u32(np, "clock-latency-ns", &val))
 		new_opp->clock_latency_ns = val;
···
 
 free_required_opps:
 	_of_opp_free_required_opps(opp_table, new_opp);
+put_node:
+	of_node_put(np);
 free_opp:
 	_opp_free(new_opp);
 

drivers/opp/opp.h

···
 };
 
 /* Routines internal to opp core */
-void dev_pm_opp_get(struct dev_pm_opp *opp);
 bool _opp_remove_all_static(struct opp_table *opp_table);
 void _get_opp_table_kref(struct opp_table *opp_table);
 int _get_opp_count(struct opp_table *opp_table);

include/linux/pm_opp.h

···
 #if defined(CONFIG_PM_OPP)
 
 struct opp_table *dev_pm_opp_get_opp_table(struct device *dev);
+void dev_pm_opp_get_opp_table_ref(struct opp_table *opp_table);
 void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
+
+unsigned long dev_pm_opp_get_bw(struct dev_pm_opp *opp, bool peak, int index);
 
 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
 
···
 struct dev_pm_opp *dev_pm_opp_find_bw_floor(struct device *dev,
 					   unsigned int *bw, int index);
 
+void dev_pm_opp_get(struct dev_pm_opp *opp);
 void dev_pm_opp_put(struct dev_pm_opp *opp);
 
 int dev_pm_opp_add_dynamic(struct device *dev, struct dev_pm_opp_data *opp);
···
 	return ERR_PTR(-EOPNOTSUPP);
 }
 
+static inline void dev_pm_opp_get_opp_table_ref(struct opp_table *opp_table) {}
+
 static inline void dev_pm_opp_put_opp_table(struct opp_table *opp_table) {}
+
+static inline unsigned long dev_pm_opp_get_bw(struct dev_pm_opp *opp, bool peak, int index)
+{
+	return 0;
+}
 
 static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
 {
···
 {
 	return ERR_PTR(-EOPNOTSUPP);
 }
+
+static inline void dev_pm_opp_get(struct dev_pm_opp *opp) {}
 
 static inline void dev_pm_opp_put(struct dev_pm_opp *opp) {}