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>
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@ -983,6 +983,32 @@ struct devfreq *devm_devfreq_add_device(struct device *dev,
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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_node - Get the devfreq device from devicetree
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* @node - pointer to device_node
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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_node(struct device_node *node)
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{
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struct devfreq *devfreq;
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if (!node)
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return ERR_PTR(-EINVAL);
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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(-ENODEV);
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}
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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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@ -1005,26 +1031,24 @@ struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int 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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of_node_put(node);
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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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devfreq = devfreq_get_devfreq_by_node(node);
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of_node_put(node);
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return ERR_PTR(-EPROBE_DEFER);
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return devfreq;
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}
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#else
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struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
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{
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return ERR_PTR(-ENODEV);
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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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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_node);
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EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle);
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/**
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@ -261,6 +261,7 @@ void devm_devfreq_unregister_notifier(struct device *dev,
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struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list);
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struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node);
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struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index);
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#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
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@ -414,6 +415,11 @@ static inline void devm_devfreq_unregister_notifier(struct device *dev,
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{
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}
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static inline struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
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{
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return ERR_PTR(-ENODEV);
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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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