Commit 7b38b7b0 authored by Leonard Crestez's avatar Leonard Crestez Committed by Chanwoo Choi
Browse files

PM / devfreq: Add devfreq_get_devfreq_by_node function 



Split off part of devfreq_get_devfreq_by_phandle into a separate
function. This allows callers to fetch devfreq instances by enumerating
devicetree instead of explicit phandles.

Acked-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: default avatarLeonard Crestez <leonard.crestez@nxp.com>
[cw00.choi: Export devfreq_get_devfreq_by_node function and
 add function to devfreq.h when CONFIG_PM_DEVFREQ is enabled.]
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent a1b8638b

drivers/devfreq/devfreq.c

+35 −11
Original line number Diff line number Diff line
@@ -983,6 +983,32 @@ struct devfreq *devm_devfreq_add_device(struct device *dev, 
EXPORT_SYMBOL(devm_devfreq_add_device);



#ifdef CONFIG_OF

/*

 * devfreq_get_devfreq_by_node - Get the devfreq device from devicetree

 * @node - pointer to device_node

 *

 * return the instance of devfreq device

 */

struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)

{

	struct devfreq *devfreq;



	if (!node)

		return ERR_PTR(-EINVAL);



	mutex_lock(&devfreq_list_lock);

	list_for_each_entry(devfreq, &devfreq_list, node) {

		if (devfreq->dev.parent

			&& devfreq->dev.parent->of_node == node) {

			mutex_unlock(&devfreq_list_lock);

			return devfreq;

		}

	}

	mutex_unlock(&devfreq_list_lock);



	return ERR_PTR(-ENODEV);

}



/*

 * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree

 * @dev - instance to the given device
@@ -1005,26 +1031,24 @@ struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) 
	if (!node)

		return ERR_PTR(-ENODEV);



	mutex_lock(&devfreq_list_lock);

	list_for_each_entry(devfreq, &devfreq_list, node) {

		if (devfreq->dev.parent

			&& devfreq->dev.parent->of_node == node) {

			mutex_unlock(&devfreq_list_lock);

	devfreq = devfreq_get_devfreq_by_node(node);

	of_node_put(node);



	return devfreq;

}

	}

	mutex_unlock(&devfreq_list_lock);

	of_node_put(node);



	return ERR_PTR(-EPROBE_DEFER);

}

#else

struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)

{

	return ERR_PTR(-ENODEV);

}



struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)

{

	return ERR_PTR(-ENODEV);

}

#endif /* CONFIG_OF */

EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_node);

EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle);



/**

include/linux/devfreq.h

+6 −0
Original line number Diff line number Diff line
@@ -261,6 +261,7 @@ void devm_devfreq_unregister_notifier(struct device *dev, 
				struct devfreq *devfreq,

				struct notifier_block *nb,

				unsigned int list);

struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node);

struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index);



#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
@@ -414,6 +415,11 @@ static inline void devm_devfreq_unregister_notifier(struct device *dev, 
{

}



static inline struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)

{

	return ERR_PTR(-ENODEV);

}



static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,

					int index)

{

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