Adding upstream version 6.8.12.upstream/6.8.12

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 362 insertions, 411 deletions

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index f2728ee787..9d2dc5e1c8 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -24,310 +24,11 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/pwm.h>
 
-static DEFINE_MUTEX(pwm_lookup_lock);
-static LIST_HEAD(pwm_lookup_list);
-
 /* protects access to pwm_chips */
 static DEFINE_MUTEX(pwm_lock);
 
 static DEFINE_IDR(pwm_chips);
 
-static struct pwm_chip *pwmchip_find_by_name(const char *name)
-{
-	struct pwm_chip *chip;
-	unsigned long id, tmp;
-
-	if (!name)
-		return NULL;
-
-	mutex_lock(&pwm_lock);
-
-	idr_for_each_entry_ul(&pwm_chips, chip, tmp, id) {
-		const char *chip_name = dev_name(chip->dev);
-
-		if (chip_name && strcmp(chip_name, name) == 0) {
-			mutex_unlock(&pwm_lock);
-			return chip;
-		}
-	}
-
-	mutex_unlock(&pwm_lock);
-
-	return NULL;
-}
-
-static int pwm_device_request(struct pwm_device *pwm, const char *label)
-{
-	int err;
-	struct pwm_chip *chip = pwm->chip;
-	const struct pwm_ops *ops = chip->ops;
-
-	if (test_bit(PWMF_REQUESTED, &pwm->flags))
-		return -EBUSY;
-
-	if (!try_module_get(chip->owner))
-		return -ENODEV;
-
-	if (ops->request) {
-		err = ops->request(chip, pwm);
-		if (err) {
-			module_put(chip->owner);
-			return err;
-		}
-	}
-
-	if (ops->get_state) {
-		/*
-		 * Zero-initialize state because most drivers are unaware of
-		 * .usage_power. The other members of state are supposed to be
-		 * set by lowlevel drivers. We still initialize the whole
-		 * structure for simplicity even though this might paper over
-		 * faulty implementations of .get_state().
-		 */
-		struct pwm_state state = { 0, };
-
-		err = ops->get_state(chip, pwm, &state);
-		trace_pwm_get(pwm, &state, err);
-
-		if (!err)
-			pwm->state = state;
-
-		if (IS_ENABLED(CONFIG_PWM_DEBUG))
-			pwm->last = pwm->state;
-	}
-
-	set_bit(PWMF_REQUESTED, &pwm->flags);
-	pwm->label = label;
-
-	return 0;
-}
-
-struct pwm_device *
-of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *args)
-{
-	struct pwm_device *pwm;
-
-	if (chip->of_pwm_n_cells < 2)
-		return ERR_PTR(-EINVAL);
-
-	/* flags in the third cell are optional */
-	if (args->args_count < 2)
-		return ERR_PTR(-EINVAL);
-
-	if (args->args[0] >= chip->npwm)
-		return ERR_PTR(-EINVAL);
-
-	pwm = pwm_request_from_chip(chip, args->args[0], NULL);
-	if (IS_ERR(pwm))
-		return pwm;
-
-	pwm->args.period = args->args[1];
-	pwm->args.polarity = PWM_POLARITY_NORMAL;
-
-	if (chip->of_pwm_n_cells >= 3) {
-		if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
-			pwm->args.polarity = PWM_POLARITY_INVERSED;
-	}
-
-	return pwm;
-}
-EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
-
-struct pwm_device *
-of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args)
-{
-	struct pwm_device *pwm;
-
-	if (chip->of_pwm_n_cells < 1)
-		return ERR_PTR(-EINVAL);
-
-	/* validate that one cell is specified, optionally with flags */
-	if (args->args_count != 1 && args->args_count != 2)
-		return ERR_PTR(-EINVAL);
-
-	pwm = pwm_request_from_chip(chip, 0, NULL);
-	if (IS_ERR(pwm))
-		return pwm;
-
-	pwm->args.period = args->args[0];
-	pwm->args.polarity = PWM_POLARITY_NORMAL;
-
-	if (args->args_count == 2 && args->args[1] & PWM_POLARITY_INVERTED)
-		pwm->args.polarity = PWM_POLARITY_INVERSED;
-
-	return pwm;
-}
-EXPORT_SYMBOL_GPL(of_pwm_single_xlate);
-
-static void of_pwmchip_add(struct pwm_chip *chip)
-{
-	if (!chip->dev || !chip->dev->of_node)
-		return;
-
-	if (!chip->of_xlate) {
-		u32 pwm_cells;
-
-		if (of_property_read_u32(chip->dev->of_node, "#pwm-cells",
-					 &pwm_cells))
-			pwm_cells = 2;
-
-		chip->of_xlate = of_pwm_xlate_with_flags;
-		chip->of_pwm_n_cells = pwm_cells;
-	}
-
-	of_node_get(chip->dev->of_node);
-}
-
-static void of_pwmchip_remove(struct pwm_chip *chip)
-{
-	if (chip->dev)
-		of_node_put(chip->dev->of_node);
-}
-
-static bool pwm_ops_check(const struct pwm_chip *chip)
-{
-	const struct pwm_ops *ops = chip->ops;
-
-	if (!ops->apply)
-		return false;
-
-	if (IS_ENABLED(CONFIG_PWM_DEBUG) && !ops->get_state)
-		dev_warn(chip->dev,
-			 "Please implement the .get_state() callback\n");
-
-	return true;
-}
-
-/**
- * __pwmchip_add() - register a new PWM chip
- * @chip: the PWM chip to add
- * @owner: reference to the module providing the chip.
- *
- * Register a new PWM chip. @owner is supposed to be THIS_MODULE, use the
- * pwmchip_add wrapper to do this right.
- *
- * Returns: 0 on success or a negative error code on failure.
- */
-int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
-{
-	unsigned int i;
-	int ret;
-
-	if (!chip || !chip->dev || !chip->ops || !chip->npwm)
-		return -EINVAL;
-
-	if (!pwm_ops_check(chip))
-		return -EINVAL;
-
-	chip->owner = owner;
-
-	chip->pwms = kcalloc(chip->npwm, sizeof(*chip->pwms), GFP_KERNEL);
-	if (!chip->pwms)
-		return -ENOMEM;
-
-	mutex_lock(&pwm_lock);
-
-	ret = idr_alloc(&pwm_chips, chip, 0, 0, GFP_KERNEL);
-	if (ret < 0) {
-		mutex_unlock(&pwm_lock);
-		kfree(chip->pwms);
-		return ret;
-	}
-
-	chip->id = ret;
-
-	for (i = 0; i < chip->npwm; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
-
-		pwm->chip = chip;
-		pwm->hwpwm = i;
-	}
-
-	mutex_unlock(&pwm_lock);
-
-	if (IS_ENABLED(CONFIG_OF))
-		of_pwmchip_add(chip);
-
-	pwmchip_sysfs_export(chip);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(__pwmchip_add);
-
-/**
- * pwmchip_remove() - remove a PWM chip
- * @chip: the PWM chip to remove
- *
- * Removes a PWM chip.
- */
-void pwmchip_remove(struct pwm_chip *chip)
-{
-	pwmchip_sysfs_unexport(chip);
-
-	if (IS_ENABLED(CONFIG_OF))
-		of_pwmchip_remove(chip);
-
-	mutex_lock(&pwm_lock);
-
-	idr_remove(&pwm_chips, chip->id);
-
-	mutex_unlock(&pwm_lock);
-
-	kfree(chip->pwms);
-}
-EXPORT_SYMBOL_GPL(pwmchip_remove);
-
-static void devm_pwmchip_remove(void *data)
-{
-	struct pwm_chip *chip = data;
-
-	pwmchip_remove(chip);
-}
-
-int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct module *owner)
-{
-	int ret;
-
-	ret = __pwmchip_add(chip, owner);
-	if (ret)
-		return ret;
-
-	return devm_add_action_or_reset(dev, devm_pwmchip_remove, chip);
-}
-EXPORT_SYMBOL_GPL(__devm_pwmchip_add);
-
-/**
- * pwm_request_from_chip() - request a PWM device relative to a PWM chip
- * @chip: PWM chip
- * @index: per-chip index of the PWM to request
- * @label: a literal description string of this PWM
- *
- * Returns: A pointer to the PWM device at the given index of the given PWM
- * chip. A negative error code is returned if the index is not valid for the
- * specified PWM chip or if the PWM device cannot be requested.
- */
-struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
-					 unsigned int index,
-					 const char *label)
-{
-	struct pwm_device *pwm;
-	int err;
-
-	if (!chip || index >= chip->npwm)
-		return ERR_PTR(-EINVAL);
-
-	mutex_lock(&pwm_lock);
-	pwm = &chip->pwms[index];
-
-	err = pwm_device_request(pwm, label);
-	if (err < 0)
-		pwm = ERR_PTR(err);
-
-	mutex_unlock(&pwm_lock);
-	return pwm;
-}
-EXPORT_SYMBOL_GPL(pwm_request_from_chip);
-
 static void pwm_apply_debug(struct pwm_device *pwm,
 			    const struct pwm_state *state)
 {
@@ -370,18 +71,18 @@ static void pwm_apply_debug(struct pwm_device *pwm,
 
 	if (s2.polarity != state->polarity &&
 	    state->duty_cycle < state->period)
-		dev_warn(chip->dev, ".apply ignored .polarity\n");
+		dev_warn(pwmchip_parent(chip), ".apply ignored .polarity\n");
 
 	if (state->enabled &&
 	    last->polarity == state->polarity &&
 	    last->period > s2.period &&
 	    last->period <= state->period)
-		dev_warn(chip->dev,
+		dev_warn(pwmchip_parent(chip),
 			 ".apply didn't pick the best available period (requested: %llu, applied: %llu, possible: %llu)\n",
 			 state->period, s2.period, last->period);
 
 	if (state->enabled && state->period < s2.period)
-		dev_warn(chip->dev,
+		dev_warn(pwmchip_parent(chip),
 			 ".apply is supposed to round down period (requested: %llu, applied: %llu)\n",
 			 state->period, s2.period);
 
@@ -390,20 +91,20 @@ static void pwm_apply_debug(struct pwm_device *pwm,
 	    last->period == s2.period &&
 	    last->duty_cycle > s2.duty_cycle &&
 	    last->duty_cycle <= state->duty_cycle)
-		dev_warn(chip->dev,
+		dev_warn(pwmchip_parent(chip),
 			 ".apply didn't pick the best available duty cycle (requested: %llu/%llu, applied: %llu/%llu, possible: %llu/%llu)\n",
 			 state->duty_cycle, state->period,
 			 s2.duty_cycle, s2.period,
 			 last->duty_cycle, last->period);
 
 	if (state->enabled && state->duty_cycle < s2.duty_cycle)
-		dev_warn(chip->dev,
+		dev_warn(pwmchip_parent(chip),
 			 ".apply is supposed to round down duty_cycle (requested: %llu/%llu, applied: %llu/%llu)\n",
 			 state->duty_cycle, state->period,
 			 s2.duty_cycle, s2.period);
 
 	if (!state->enabled && s2.enabled && s2.duty_cycle > 0)
-		dev_warn(chip->dev,
+		dev_warn(pwmchip_parent(chip),
 			 "requested disabled, but yielded enabled with duty > 0\n");
 
 	/* reapply the state that the driver reported being configured. */
@@ -411,7 +112,7 @@ static void pwm_apply_debug(struct pwm_device *pwm,
 	trace_pwm_apply(pwm, &s1, err);
 	if (err) {
 		*last = s1;
-		dev_err(chip->dev, "failed to reapply current setting\n");
+		dev_err(pwmchip_parent(chip), "failed to reapply current setting\n");
 		return;
 	}
 
@@ -426,7 +127,7 @@ static void pwm_apply_debug(struct pwm_device *pwm,
 	    s1.polarity != last->polarity ||
 	    (s1.enabled && s1.period != last->period) ||
 	    (s1.enabled && s1.duty_cycle != last->duty_cycle)) {
-		dev_err(chip->dev,
+		dev_err(pwmchip_parent(chip),
 			".apply is not idempotent (ena=%d pol=%d %llu/%llu) -> (ena=%d pol=%d %llu/%llu)\n",
 			s1.enabled, s1.polarity, s1.duty_cycle, s1.period,
 			last->enabled, last->polarity, last->duty_cycle,
@@ -524,33 +225,6 @@ int pwm_apply_atomic(struct pwm_device *pwm, const struct pwm_state *state)
 EXPORT_SYMBOL_GPL(pwm_apply_atomic);
 
 /**
- * pwm_capture() - capture and report a PWM signal
- * @pwm: PWM device
- * @result: structure to fill with capture result
- * @timeout: time to wait, in milliseconds, before giving up on capture
- *
- * Returns: 0 on success or a negative error code on failure.
- */
-int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
-		unsigned long timeout)
-{
-	int err;
-
-	if (!pwm || !pwm->chip->ops)
-		return -EINVAL;
-
-	if (!pwm->chip->ops->capture)
-		return -ENOSYS;
-
-	mutex_lock(&pwm_lock);
-	err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
-	mutex_unlock(&pwm_lock);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(pwm_capture);
-
-/**
  * pwm_adjust_config() - adjust the current PWM config to the PWM arguments
  * @pwm: PWM device
  *
@@ -606,24 +280,309 @@ int pwm_adjust_config(struct pwm_device *pwm)
 }
 EXPORT_SYMBOL_GPL(pwm_adjust_config);
 
-static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode)
+/**
+ * pwm_capture() - capture and report a PWM signal
+ * @pwm: PWM device
+ * @result: structure to fill with capture result
+ * @timeout: time to wait, in milliseconds, before giving up on capture
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
+		unsigned long timeout)
+{
+	int err;
+
+	if (!pwm || !pwm->chip->ops)
+		return -EINVAL;
+
+	if (!pwm->chip->ops->capture)
+		return -ENOSYS;
+
+	mutex_lock(&pwm_lock);
+	err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
+	mutex_unlock(&pwm_lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(pwm_capture);
+
+static struct pwm_chip *pwmchip_find_by_name(const char *name)
 {
 	struct pwm_chip *chip;
 	unsigned long id, tmp;
 
+	if (!name)
+		return NULL;
+
 	mutex_lock(&pwm_lock);
 
-	idr_for_each_entry_ul(&pwm_chips, chip, tmp, id)
-		if (chip->dev && device_match_fwnode(chip->dev, fwnode)) {
+	idr_for_each_entry_ul(&pwm_chips, chip, tmp, id) {
+		const char *chip_name = dev_name(pwmchip_parent(chip));
+
+		if (chip_name && strcmp(chip_name, name) == 0) {
 			mutex_unlock(&pwm_lock);
 			return chip;
 		}
+	}
 
 	mutex_unlock(&pwm_lock);
 
-	return ERR_PTR(-EPROBE_DEFER);
+	return NULL;
+}
+
+static int pwm_device_request(struct pwm_device *pwm, const char *label)
+{
+	int err;
+	struct pwm_chip *chip = pwm->chip;
+	const struct pwm_ops *ops = chip->ops;
+
+	if (test_bit(PWMF_REQUESTED, &pwm->flags))
+		return -EBUSY;
+
+	if (!try_module_get(chip->owner))
+		return -ENODEV;
+
+	if (ops->request) {
+		err = ops->request(chip, pwm);
+		if (err) {
+			module_put(chip->owner);
+			return err;
+		}
+	}
+
+	if (ops->get_state) {
+		/*
+		 * Zero-initialize state because most drivers are unaware of
+		 * .usage_power. The other members of state are supposed to be
+		 * set by lowlevel drivers. We still initialize the whole
+		 * structure for simplicity even though this might paper over
+		 * faulty implementations of .get_state().
+		 */
+		struct pwm_state state = { 0, };
+
+		err = ops->get_state(chip, pwm, &state);
+		trace_pwm_get(pwm, &state, err);
+
+		if (!err)
+			pwm->state = state;
+
+		if (IS_ENABLED(CONFIG_PWM_DEBUG))
+			pwm->last = pwm->state;
+	}
+
+	set_bit(PWMF_REQUESTED, &pwm->flags);
+	pwm->label = label;
+
+	return 0;
+}
+
+/**
+ * pwm_request_from_chip() - request a PWM device relative to a PWM chip
+ * @chip: PWM chip
+ * @index: per-chip index of the PWM to request
+ * @label: a literal description string of this PWM
+ *
+ * Returns: A pointer to the PWM device at the given index of the given PWM
+ * chip. A negative error code is returned if the index is not valid for the
+ * specified PWM chip or if the PWM device cannot be requested.
+ */
+struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
+					 unsigned int index,
+					 const char *label)
+{
+	struct pwm_device *pwm;
+	int err;
+
+	if (!chip || index >= chip->npwm)
+		return ERR_PTR(-EINVAL);
+
+	mutex_lock(&pwm_lock);
+	pwm = &chip->pwms[index];
+
+	err = pwm_device_request(pwm, label);
+	if (err < 0)
+		pwm = ERR_PTR(err);
+
+	mutex_unlock(&pwm_lock);
+	return pwm;
+}
+EXPORT_SYMBOL_GPL(pwm_request_from_chip);
+
+
+struct pwm_device *
+of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *args)
+{
+	struct pwm_device *pwm;
+
+	/* period in the second cell and flags in the third cell are optional */
+	if (args->args_count < 1)
+		return ERR_PTR(-EINVAL);
+
+	pwm = pwm_request_from_chip(chip, args->args[0], NULL);
+	if (IS_ERR(pwm))
+		return pwm;
+
+	if (args->args_count > 1)
+		pwm->args.period = args->args[1];
+
+	pwm->args.polarity = PWM_POLARITY_NORMAL;
+	if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
+		pwm->args.polarity = PWM_POLARITY_INVERSED;
+
+	return pwm;
+}
+EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
+
+struct pwm_device *
+of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args)
+{
+	struct pwm_device *pwm;
+
+	pwm = pwm_request_from_chip(chip, 0, NULL);
+	if (IS_ERR(pwm))
+		return pwm;
+
+	if (args->args_count > 0)
+		pwm->args.period = args->args[0];
+
+	pwm->args.polarity = PWM_POLARITY_NORMAL;
+	if (args->args_count > 1 && args->args[1] & PWM_POLARITY_INVERTED)
+		pwm->args.polarity = PWM_POLARITY_INVERSED;
+
+	return pwm;
+}
+EXPORT_SYMBOL_GPL(of_pwm_single_xlate);
+
+static void of_pwmchip_add(struct pwm_chip *chip)
+{
+	if (!pwmchip_parent(chip) || !pwmchip_parent(chip)->of_node)
+		return;
+
+	if (!chip->of_xlate)
+		chip->of_xlate = of_pwm_xlate_with_flags;
+
+	of_node_get(pwmchip_parent(chip)->of_node);
+}
+
+static void of_pwmchip_remove(struct pwm_chip *chip)
+{
+	if (pwmchip_parent(chip))
+		of_node_put(pwmchip_parent(chip)->of_node);
 }
 
+static bool pwm_ops_check(const struct pwm_chip *chip)
+{
+	const struct pwm_ops *ops = chip->ops;
+
+	if (!ops->apply)
+		return false;
+
+	if (IS_ENABLED(CONFIG_PWM_DEBUG) && !ops->get_state)
+		dev_warn(pwmchip_parent(chip),
+			 "Please implement the .get_state() callback\n");
+
+	return true;
+}
+
+/**
+ * __pwmchip_add() - register a new PWM chip
+ * @chip: the PWM chip to add
+ * @owner: reference to the module providing the chip.
+ *
+ * Register a new PWM chip. @owner is supposed to be THIS_MODULE, use the
+ * pwmchip_add wrapper to do this right.
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
+{
+	unsigned int i;
+	int ret;
+
+	if (!chip || !pwmchip_parent(chip) || !chip->ops || !chip->npwm)
+		return -EINVAL;
+
+	if (!pwm_ops_check(chip))
+		return -EINVAL;
+
+	chip->owner = owner;
+
+	chip->pwms = kcalloc(chip->npwm, sizeof(*chip->pwms), GFP_KERNEL);
+	if (!chip->pwms)
+		return -ENOMEM;
+
+	mutex_lock(&pwm_lock);
+
+	ret = idr_alloc(&pwm_chips, chip, 0, 0, GFP_KERNEL);
+	if (ret < 0) {
+		mutex_unlock(&pwm_lock);
+		kfree(chip->pwms);
+		return ret;
+	}
+
+	chip->id = ret;
+
+	for (i = 0; i < chip->npwm; i++) {
+		struct pwm_device *pwm = &chip->pwms[i];
+
+		pwm->chip = chip;
+		pwm->hwpwm = i;
+	}
+
+	mutex_unlock(&pwm_lock);
+
+	if (IS_ENABLED(CONFIG_OF))
+		of_pwmchip_add(chip);
+
+	pwmchip_sysfs_export(chip);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__pwmchip_add);
+
+/**
+ * pwmchip_remove() - remove a PWM chip
+ * @chip: the PWM chip to remove
+ *
+ * Removes a PWM chip.
+ */
+void pwmchip_remove(struct pwm_chip *chip)
+{
+	pwmchip_sysfs_unexport(chip);
+
+	if (IS_ENABLED(CONFIG_OF))
+		of_pwmchip_remove(chip);
+
+	mutex_lock(&pwm_lock);
+
+	idr_remove(&pwm_chips, chip->id);
+
+	mutex_unlock(&pwm_lock);
+
+	kfree(chip->pwms);
+}
+EXPORT_SYMBOL_GPL(pwmchip_remove);
+
+static void devm_pwmchip_remove(void *data)
+{
+	struct pwm_chip *chip = data;
+
+	pwmchip_remove(chip);
+}
+
+int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct module *owner)
+{
+	int ret;
+
+	ret = __pwmchip_add(chip, owner);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, devm_pwmchip_remove, chip);
+}
+EXPORT_SYMBOL_GPL(__devm_pwmchip_add);
+
 static struct device_link *pwm_device_link_add(struct device *dev,
 					       struct pwm_device *pwm)
 {
@@ -635,21 +594,39 @@ static struct device_link *pwm_device_link_add(struct device *dev,
 		 * impact the PM sequence ordering: the PWM supplier may get
 		 * suspended before the consumer.
 		 */
-		dev_warn(pwm->chip->dev,
+		dev_warn(pwmchip_parent(pwm->chip),
 			 "No consumer device specified to create a link to\n");
 		return NULL;
 	}
 
-	dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
+	dl = device_link_add(dev, pwmchip_parent(pwm->chip), DL_FLAG_AUTOREMOVE_CONSUMER);
 	if (!dl) {
 		dev_err(dev, "failed to create device link to %s\n",
-			dev_name(pwm->chip->dev));
+			dev_name(pwmchip_parent(pwm->chip)));
 		return ERR_PTR(-EINVAL);
 	}
 
 	return dl;
 }
 
+static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode)
+{
+	struct pwm_chip *chip;
+	unsigned long id, tmp;
+
+	mutex_lock(&pwm_lock);
+
+	idr_for_each_entry_ul(&pwm_chips, chip, tmp, id)
+		if (pwmchip_parent(chip) && device_match_fwnode(pwmchip_parent(chip), fwnode)) {
+			mutex_unlock(&pwm_lock);
+			return chip;
+		}
+
+	mutex_unlock(&pwm_lock);
+
+	return ERR_PTR(-EPROBE_DEFER);
+}
+
 /**
  * of_pwm_get() - request a PWM via the PWM framework
  * @dev: device for PWM consumer
@@ -784,6 +761,9 @@ static struct pwm_device *acpi_pwm_get(const struct fwnode_handle *fwnode)
 	return pwm;
 }
 
+static DEFINE_MUTEX(pwm_lookup_lock);
+static LIST_HEAD(pwm_lookup_list);
+
 /**
  * pwm_add_table() - register PWM device consumers
  * @table: array of consumers to register
@@ -1105,8 +1085,8 @@ static int pwm_seq_show(struct seq_file *s, void *v)
 
 	seq_printf(s, "%s%d: %s/%s, %d PWM device%s\n",
 		   (char *)s->private, chip->id,
-		   chip->dev->bus ? chip->dev->bus->name : "no-bus",
-		   dev_name(chip->dev), chip->npwm,
+		   pwmchip_parent(chip)->bus ? pwmchip_parent(chip)->bus->name : "no-bus",
+		   dev_name(pwmchip_parent(chip)), chip->npwm,
 		   (chip->npwm != 1) ? "s" : "");
 
 	pwm_dbg_show(chip, s);
diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c
index 42179b3f7e..06562d4bb9 100644
--- a/drivers/pwm/pwm-clps711x.c
+++ b/drivers/pwm/pwm-clps711x.c
@@ -103,7 +103,6 @@ static int clps711x_pwm_probe(struct platform_device *pdev)
 	priv->chip.dev = &pdev->dev;
 	priv->chip.npwm = 2;
 	priv->chip.of_xlate = clps711x_pwm_xlate;
-	priv->chip.of_pwm_n_cells = 1;
 
 	spin_lock_init(&priv->lock);
 
diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c
index 5fe303b865..339cedf3a7 100644
--- a/drivers/pwm/pwm-cros-ec.c
+++ b/drivers/pwm/pwm-cros-ec.c
@@ -279,7 +279,6 @@ static int cros_ec_pwm_probe(struct platform_device *pdev)
 	chip->dev = dev;
 	chip->ops = &cros_ec_pwm_ops;
 	chip->of_xlate = cros_ec_pwm_xlate;
-	chip->of_pwm_n_cells = 1;
 
 	if (ec_pwm->use_pwm_type) {
 		chip->npwm = CROS_EC_PWM_DT_COUNT;
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 2971bbf3b5..52ac3277f4 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -122,7 +122,7 @@ static int meson_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
-	struct device *dev = chip->dev;
+	struct device *dev = pwmchip_parent(chip);
 	int err;
 
 	err = clk_prepare_enable(channel->clk);
@@ -143,12 +143,13 @@ static void meson_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	clk_disable_unprepare(channel->clk);
 }
 
-static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
+static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm,
 			  const struct pwm_state *state)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
 	unsigned int cnt, duty_cnt;
-	unsigned long fin_freq;
+	long fin_freq;
 	u64 duty, period, freq;
 
 	duty = state->duty_cycle;
@@ -168,20 +169,21 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 		freq = ULONG_MAX;
 
 	fin_freq = clk_round_rate(channel->clk, freq);
-	if (fin_freq == 0) {
-		dev_err(meson->chip.dev, "invalid source clock frequency\n");
-		return -EINVAL;
+	if (fin_freq <= 0) {
+		dev_err(pwmchip_parent(chip),
+			"invalid source clock frequency %llu\n", freq);
+		return fin_freq ? fin_freq : -EINVAL;
 	}
 
-	dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq);
+	dev_dbg(pwmchip_parent(chip), "fin_freq: %ld Hz\n", fin_freq);
 
-	cnt = div_u64(fin_freq * period, NSEC_PER_SEC);
+	cnt = mul_u64_u64_div_u64(fin_freq, period, NSEC_PER_SEC);
 	if (cnt > 0xffff) {
-		dev_err(meson->chip.dev, "unable to get period cnt\n");
+		dev_err(pwmchip_parent(chip), "unable to get period cnt\n");
 		return -EINVAL;
 	}
 
-	dev_dbg(meson->chip.dev, "period=%llu cnt=%u\n", period, cnt);
+	dev_dbg(pwmchip_parent(chip), "period=%llu cnt=%u\n", period, cnt);
 
 	if (duty == period) {
 		channel->hi = cnt;
@@ -190,9 +192,9 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 		channel->hi = 0;
 		channel->lo = cnt;
 	} else {
-		duty_cnt = div_u64(fin_freq * duty, NSEC_PER_SEC);
+		duty_cnt = mul_u64_u64_div_u64(fin_freq, duty, NSEC_PER_SEC);
 
-		dev_dbg(meson->chip.dev, "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
+		dev_dbg(pwmchip_parent(chip), "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
 
 		channel->hi = duty_cnt;
 		channel->lo = cnt - duty_cnt;
@@ -203,8 +205,9 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 	return 0;
 }
 
-static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
+static void meson_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
 	struct meson_pwm_channel_data *channel_data;
 	unsigned long flags;
@@ -215,7 +218,7 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
 
 	err = clk_set_rate(channel->clk, channel->rate);
 	if (err)
-		dev_err(meson->chip.dev, "setting clock rate failed\n");
+		dev_err(pwmchip_parent(chip), "setting clock rate failed\n");
 
 	spin_lock_irqsave(&meson->lock, flags);
 
@@ -230,8 +233,9 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
 	spin_unlock_irqrestore(&meson->lock, flags);
 }
 
-static void meson_pwm_disable(struct meson_pwm *meson, struct pwm_device *pwm)
+static void meson_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	unsigned long flags;
 	u32 value;
 
@@ -269,16 +273,16 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			channel->hi = ~0;
 			channel->lo = 0;
 
-			meson_pwm_enable(meson, pwm);
+			meson_pwm_enable(chip, pwm);
 		} else {
-			meson_pwm_disable(meson, pwm);
+			meson_pwm_disable(chip, pwm);
 		}
 	} else {
-		err = meson_pwm_calc(meson, pwm, state);
+		err = meson_pwm_calc(chip, pwm, state);
 		if (err < 0)
 			return err;
 
-		meson_pwm_enable(meson, pwm);
+		meson_pwm_enable(chip, pwm);
 	}
 
 	return 0;
@@ -432,10 +436,11 @@ static const struct of_device_id meson_pwm_matches[] = {
 };
 MODULE_DEVICE_TABLE(of, meson_pwm_matches);
 
-static int meson_pwm_init_channels(struct meson_pwm *meson)
+static int meson_pwm_init_channels(struct pwm_chip *chip)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct clk_parent_data mux_parent_data[MESON_MAX_MUX_PARENTS] = {};
-	struct device *dev = meson->chip.dev;
+	struct device *dev = pwmchip_parent(chip);
 	unsigned int i;
 	char name[255];
 	int err;
@@ -445,7 +450,7 @@ static int meson_pwm_init_channels(struct meson_pwm *meson)
 		mux_parent_data[i].name = meson->data->parent_names[i];
 	}
 
-	for (i = 0; i < meson->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		struct meson_pwm_channel *channel = &meson->channels[i];
 		struct clk_parent_data div_parent = {}, gate_parent = {};
 		struct clk_init_data init = {};
@@ -543,7 +548,7 @@ static int meson_pwm_probe(struct platform_device *pdev)
 
 	meson->data = of_device_get_match_data(&pdev->dev);
 
-	err = meson_pwm_init_channels(meson);
+	err = meson_pwm_init_channels(&meson->chip);
 	if (err < 0)
 		return err;
 
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 76685f926c..61b74fa1d3 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -180,10 +180,8 @@ static int pwm_probe(struct platform_device *pdev)
 	pc->chip.ops = &pxa_pwm_ops;
 	pc->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
 
-	if (IS_ENABLED(CONFIG_OF)) {
+	if (IS_ENABLED(CONFIG_OF))
 		pc->chip.of_xlate = of_pwm_single_xlate;
-		pc->chip.of_pwm_n_cells = 1;
-	}
 
 	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pc->mmio_base))
diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c
index 69b1113c6b..f3df7b1895 100644
--- a/drivers/pwm/pwm-sti.c
+++ b/drivers/pwm/pwm-sti.c
@@ -570,6 +570,7 @@ static int sti_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct sti_pwm_compat_data *cdata;
+	struct pwm_chip *chip;
 	struct sti_pwm_chip *pc;
 	unsigned int i;
 	int irq, ret;
@@ -577,6 +578,7 @@ static int sti_pwm_probe(struct platform_device *pdev)
 	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
 	if (!pc)
 		return -ENOMEM;
+	chip = &pc->chip;
 
 	cdata = devm_kzalloc(dev, sizeof(*cdata), GFP_KERNEL);
 	if (!cdata)
@@ -622,40 +624,28 @@ static int sti_pwm_probe(struct platform_device *pdev)
 		return ret;
 
 	if (cdata->pwm_num_devs) {
-		pc->pwm_clk = of_clk_get_by_name(dev->of_node, "pwm");
+		pc->pwm_clk = devm_clk_get_prepared(dev, "pwm");
 		if (IS_ERR(pc->pwm_clk)) {
 			dev_err(dev, "failed to get PWM clock\n");
 			return PTR_ERR(pc->pwm_clk);
 		}
-
-		ret = clk_prepare(pc->pwm_clk);
-		if (ret) {
-			dev_err(dev, "failed to prepare clock\n");
-			return ret;
-		}
 	}
 
 	if (cdata->cpt_num_devs) {
-		pc->cpt_clk = of_clk_get_by_name(dev->of_node, "capture");
+		pc->cpt_clk = devm_clk_get_prepared(dev, "capture");
 		if (IS_ERR(pc->cpt_clk)) {
 			dev_err(dev, "failed to get PWM capture clock\n");
 			return PTR_ERR(pc->cpt_clk);
 		}
 
-		ret = clk_prepare(pc->cpt_clk);
-		if (ret) {
-			dev_err(dev, "failed to prepare clock\n");
-			return ret;
-		}
-
 		cdata->ddata = devm_kzalloc(dev, cdata->cpt_num_devs * sizeof(*cdata->ddata), GFP_KERNEL);
 		if (!cdata->ddata)
 			return -ENOMEM;
 	}
 
-	pc->chip.dev = dev;
-	pc->chip.ops = &sti_pwm_ops;
-	pc->chip.npwm = max(cdata->pwm_num_devs, cdata->cpt_num_devs);
+	chip->dev = dev;
+	chip->ops = &sti_pwm_ops;
+	chip->npwm = max(cdata->pwm_num_devs, cdata->cpt_num_devs);
 
 	for (i = 0; i < cdata->cpt_num_devs; i++) {
 		struct sti_cpt_ddata *ddata = &cdata->ddata[i];
@@ -664,26 +654,7 @@ static int sti_pwm_probe(struct platform_device *pdev)
 		mutex_init(&ddata->lock);
 	}
 
-	ret = pwmchip_add(&pc->chip);
-	if (ret < 0) {
-		clk_unprepare(pc->pwm_clk);
-		clk_unprepare(pc->cpt_clk);
-		return ret;
-	}
-
-	platform_set_drvdata(pdev, pc);
-
-	return 0;
-}
-
-static void sti_pwm_remove(struct platform_device *pdev)
-{
-	struct sti_pwm_chip *pc = platform_get_drvdata(pdev);
-
-	pwmchip_remove(&pc->chip);
-
-	clk_unprepare(pc->pwm_clk);
-	clk_unprepare(pc->cpt_clk);
+	return devm_pwmchip_add(dev, chip);
 }
 
 static const struct of_device_id sti_pwm_of_match[] = {
@@ -698,7 +669,6 @@ static struct platform_driver sti_pwm_driver = {
 		.of_match_table = sti_pwm_of_match,
 	},
 	.probe = sti_pwm_probe,
-	.remove_new = sti_pwm_remove,
 };
 module_platform_driver(sti_pwm_driver);
 
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 1698609d91..3f434a771f 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -509,10 +509,10 @@ void pwmchip_sysfs_export(struct pwm_chip *chip)
 	 * If device_create() fails the pwm_chip is still usable by
 	 * the kernel it's just not exported.
 	 */
-	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,
+	parent = device_create(&pwm_class, pwmchip_parent(chip), MKDEV(0, 0), chip,
 			       "pwmchip%d", chip->id);
 	if (IS_ERR(parent)) {
-		dev_warn(chip->dev,
+		dev_warn(pwmchip_parent(chip),
 			 "device_create failed for pwm_chip sysfs export\n");
 	}
 }