Commit 8f510aeb authored by Chanwoo Choi's avatar Chanwoo Choi Committed by MyungJoo Ham
Browse files

PM / devfreq: Add devfreq_get_devfreq_by_phandle() 



This patch adds the new devfreq_get_devfreq_by_phandle() OF helper function
which can find the instance of devfreq device by using phandle ("devfreq").

Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: default avatarMarkus Reichl <m.reichl@fivetechno.de>
Tested-by: default avatarAnand Moon <linux.amoon@gmail.com>
Acked-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
parent 72c160bd

drivers/devfreq/devfreq.c

+44 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/list.h>

#include <linux/printk.h>

#include <linux/hrtimer.h>

#include <linux/of.h>

#include "governor.h"



static struct class *devfreq_class;
@@ -639,6 +640,49 @@ struct devfreq *devm_devfreq_add_device(struct device *dev, 
}

EXPORT_SYMBOL(devm_devfreq_add_device);



#ifdef CONFIG_OF

/*

 * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree

 * @dev - instance to the given device

 * @index - index into list of devfreq

 *

 * return the instance of devfreq device

 */

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

{

	struct device_node *node;

	struct devfreq *devfreq;



	if (!dev)

		return ERR_PTR(-EINVAL);



	if (!dev->of_node)

		return ERR_PTR(-EINVAL);



	node = of_parse_phandle(dev->of_node, "devfreq", 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);

			return devfreq;

		}

	}

	mutex_unlock(&devfreq_list_lock);



	return ERR_PTR(-EPROBE_DEFER);

}

#else

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_phandle);



/**

 * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()

 * @dev:	the device to add devfreq feature.

include/linux/devfreq.h

+9 −0
Original line number Diff line number Diff line
@@ -208,6 +208,9 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev, 
extern void devm_devfreq_unregister_opp_notifier(struct device *dev,

						struct devfreq *devfreq);



extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,

						int index);



/**

 * devfreq_update_stats() - update the last_status pointer in struct devfreq

 * @df:		the devfreq instance whose status needs updating
@@ -307,6 +310,12 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev, 
{

}



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

							int index)

{

	return ERR_PTR(-ENODEV);

}



static inline int devfreq_update_stats(struct devfreq *df)

{

	return -EINVAL;

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