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authorLeonard Crestez <leonard.crestez@nxp.com>2020-09-08 19:24:45 +0900
committerChanwoo Choi <cw00.choi@samsung.com>2020-09-29 17:50:09 +0900
commit7b38b7b0427df70237e3c9c73f2db6b99be2b4b9 (patch)
tree9a92fc61050105b294a42d142f12170f935950fb
parenta1b8638ba1320e6684aa98233c15255eb803fac7 (diff)
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>
-rw-r--r--drivers/devfreq/devfreq.c46
-rw-r--r--include/linux/devfreq.h6
2 files changed, 41 insertions, 11 deletions
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
@@ -984,6 +984,32 @@ 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
* @index - index into list of devfreq
@@ -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);
/**
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 12782fbb4c25..eb971b8e5051 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -261,6 +261,7 @@ void devm_devfreq_unregister_notifier(struct device *dev,
struct devfreq *devfreq,
struct notifier_block *nb,
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);
#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,
int index)
{