From 7b38b7b0427df70237e3c9c73f2db6b99be2b4b9 Mon Sep 17 00:00:00 2001 From: Leonard Crestez Date: Tue, 8 Sep 2020 19:24:45 +0900 Subject: 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 Reviewed-by: Lukasz Luba Signed-off-by: Leonard Crestez [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 --- drivers/devfreq/devfreq.c | 46 +++++++++++++++++++++++++++++++++++----------- 1 file changed, 35 insertions(+), 11 deletions(-) (limited to 'drivers/devfreq') diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 071b59fe84d2..d4424b5d8306 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -983,6 +983,32 @@ struct devfreq *devm_devfreq_add_device(struct device *dev, EXPORT_SYMBOL(devm_devfreq_add_device); #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 * @dev - instance to the given device @@ -1005,26 +1031,24 @@ struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int 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); - of_node_put(node); - return devfreq; - } - } - mutex_unlock(&devfreq_list_lock); + devfreq = devfreq_get_devfreq_by_node(node); of_node_put(node); - return ERR_PTR(-EPROBE_DEFER); + return devfreq; } + #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) { return ERR_PTR(-ENODEV); } #endif /* CONFIG_OF */ +EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_node); EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); /** -- cgit v1.2.3-59-g8ed1b