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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: 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>
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@ -25,6 +25,7 @@
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#include <linux/list.h>
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#include <linux/printk.h>
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#include <linux/hrtimer.h>
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#include <linux/of.h>
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#include "governor.h"
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static struct class *devfreq_class;
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@ -639,6 +640,49 @@ struct devfreq *devm_devfreq_add_device(struct device *dev,
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}
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EXPORT_SYMBOL(devm_devfreq_add_device);
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#ifdef CONFIG_OF
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/*
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* devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
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* @dev - instance to the given device
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* @index - index into list of devfreq
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*
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* return the instance of devfreq device
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*/
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struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
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{
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struct device_node *node;
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struct devfreq *devfreq;
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if (!dev)
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return ERR_PTR(-EINVAL);
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if (!dev->of_node)
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return ERR_PTR(-EINVAL);
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node = of_parse_phandle(dev->of_node, "devfreq", index);
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if (!node)
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return ERR_PTR(-ENODEV);
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mutex_lock(&devfreq_list_lock);
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list_for_each_entry(devfreq, &devfreq_list, node) {
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if (devfreq->dev.parent
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&& devfreq->dev.parent->of_node == node) {
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mutex_unlock(&devfreq_list_lock);
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return devfreq;
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}
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}
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mutex_unlock(&devfreq_list_lock);
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return ERR_PTR(-EPROBE_DEFER);
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}
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#else
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struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif /* CONFIG_OF */
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EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle);
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/**
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* devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
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* @dev: the device to add devfreq feature.
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@ -208,6 +208,9 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev,
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extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
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struct devfreq *devfreq);
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extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
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int index);
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/**
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* devfreq_update_stats() - update the last_status pointer in struct devfreq
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* @df: the devfreq instance whose status needs updating
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@ -307,6 +310,12 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
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{
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}
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static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
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int index)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline int devfreq_update_stats(struct devfreq *df)
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{
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return -EINVAL;
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