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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: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Leonard 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: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Leonard Crestez 2020-09-08 19:24:45 +09:00 committed by Chanwoo Choi
parent a1b8638ba1
commit 7b38b7b042
2 changed files with 41 additions and 11 deletions
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46
drivers/devfreq/devfreq.c
View File

@ -983,6 +983,32 @@ struct devfreq *devm_devfreq_add_device(struct device *dev,
EXPORT_SYMBOL(devm_devfreq_add_device); EXPORT_SYMBOL(devm_devfreq_add_device);
#ifdef CONFIG_OF #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 * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
* @dev - instance to the given device * @dev - instance to the given device
@ -1005,26 +1031,24 @@ struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
if (!node) if (!node)
return ERR_PTR(-ENODEV); return ERR_PTR(-ENODEV);
mutex_lock(&devfreq_list_lock); devfreq = devfreq_get_devfreq_by_node(node);
list_for_each_entry(devfreq, &devfreq_list, node) {
if (devfreq->dev.parent
&& devfreq->dev.parent->of_node == node) {
mutex_unlock(&devfreq_list_lock);
of_node_put(node);
return devfreq;
}
}
mutex_unlock(&devfreq_list_lock);
of_node_put(node); of_node_put(node);
return ERR_PTR(-EPROBE_DEFER); return devfreq;
} }
#else #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) struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
{ {
return ERR_PTR(-ENODEV); return ERR_PTR(-ENODEV);
} }
#endif /* CONFIG_OF */ #endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_node);
EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle);
/** /**

6
include/linux/devfreq.h
View File

@ -261,6 +261,7 @@ void devm_devfreq_unregister_notifier(struct device *dev,
struct devfreq *devfreq, struct devfreq *devfreq,
struct notifier_block *nb, struct notifier_block *nb,
unsigned int list); 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); struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index);
#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND) #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, static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
int index) int index)
{ {