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| author |   Leonard Crestez <leonard.crestez@nxp.com> | 2020-09-08 19:24:45 +0900 |
|---|---|---|
| committer |   Chanwoo Choi <cw00.choi@samsung.com> | 2020-09-29 17:50:09 +0900 |
| commit | 7b38b7b0427df70237e3c9c73f2db6b99be2b4b9 (patch) | |
| tree | 9a92fc61050105b294a42d142f12170f935950fb /drivers/devfreq | |
| parent | Linux 5.9-rc7 (diff) | |
| download | linux-dev-7b38b7b0427df70237e3c9c73f2db6b99be2b4b9.tar.xz linux-dev-7b38b7b0427df70237e3c9c73f2db6b99be2b4b9.zip | |
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>
Diffstat (limited to 'drivers/devfreq')
| -rw-r--r-- | drivers/devfreq/devfreq.c | 46 |
1 files changed, 35 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); /** |