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PM / devfreq: Add devfreq_get_devfreq_by_phandle()

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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: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This commit is contained in:
Chanwoo Choi 2015-11-10 20:31:07 +09:00 committed by MyungJoo Ham
parent 72c160bda1
commit 8f510aeb22
2 changed files with 53 additions and 0 deletions
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44
drivers/devfreq/devfreq.c
View File

@ -25,6 +25,7 @@
#include <linux/list.h> #include <linux/list.h>
#include <linux/printk.h> #include <linux/printk.h>
#include <linux/hrtimer.h> #include <linux/hrtimer.h>
#include <linux/of.h>
#include "governor.h" #include "governor.h"
static struct class *devfreq_class; static struct class *devfreq_class;
@ -639,6 +640,49 @@ struct devfreq *devm_devfreq_add_device(struct device *dev,
} }
EXPORT_SYMBOL(devm_devfreq_add_device); 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() * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
* @dev: the device to add devfreq feature. * @dev: the device to add devfreq feature.

9
include/linux/devfreq.h
View File

@ -208,6 +208,9 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev,
extern void devm_devfreq_unregister_opp_notifier(struct device *dev, extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
struct devfreq *devfreq); 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 * devfreq_update_stats() - update the last_status pointer in struct devfreq
* @df: the devfreq instance whose status needs updating * @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) static inline int devfreq_update_stats(struct devfreq *df)
{ {
return -EINVAL; return -EINVAL;