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    Subject[RFC PATCH 06/15] PM / devfreq: Add devfreq_get_devfreq_by_phandle()
    Date
    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>
    ---
    drivers/devfreq/devfreq.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
    include/linux/devfreq.h | 9 +++++++++
    2 files changed, 53 insertions(+)

    diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
    index 15e58779e4c0..78ea4cdaa82c 100644
    --- a/drivers/devfreq/devfreq.c
    +++ b/drivers/devfreq/devfreq.c
    @@ -25,6 +25,7 @@
    #include <linux/list.h>
    #include <linux/printk.h>
    #include <linux/hrtimer.h>
    +#include <linux/of.h>
    #include "governor.h"

    static struct class *devfreq_class;
    @@ -686,6 +687,49 @@ struct devfreq *devm_devfreq_add_device(struct device *dev,
    }
    EXPORT_SYMBOL(devm_devfreq_add_device);

    +#ifdef CONFIG_OF
    +/*
    + * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
    + * @dev - instance to the given device
    + * @index - index into list of devfreq
    + *
    + * return the instance of devfreq device
    + */
    +struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
    +{
    + struct device_node *node;
    + struct devfreq *devfreq;
    +
    + if (!dev)
    + return ERR_PTR(-EINVAL);
    +
    + if (!dev->of_node)
    + return ERR_PTR(-EINVAL);
    +
    + node = of_parse_phandle(dev->of_node, "devfreq", 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);
    + return devfreq;
    + }
    + }
    + mutex_unlock(&devfreq_list_lock);
    +
    + return ERR_PTR(-EPROBE_DEFER);
    +}
    +#else
    +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_phandle);
    +
    /**
    * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
    * @dev: the device to add devfreq feature.
    diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
    index f7a6e6bd716e..d648041145ba 100644
    --- a/include/linux/devfreq.h
    +++ b/include/linux/devfreq.h
    @@ -211,6 +211,9 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev,
    extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
    struct devfreq *devfreq);

    +extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
    + int index);
    +
    /**
    * devfreq_update_stats() - update the last_status pointer in struct devfreq
    * @df: the devfreq instance whose status needs updating
    @@ -324,6 +327,12 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
    {
    }

    +static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
    + int index)
    +{
    + return ERR_PTR(-ENODEV);
    +}
    +
    static inline int devfreq_update_stats(struct devfreq *df)
    {
    return -EINVAL;
    --
    1.9.1


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