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pwm: Add devm_of_pwm_get() as exported API for users

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When booted with DT users can use devm version of of_pwm_get() to benefit
from automatic resource release.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Peter Ujfalusi
2012-12-21 01:43:59 -08:00
committed by Bryan Wu
parent 8eb9612799
commit 261a5edd3a
2 changed files with 39 additions and 0 deletions
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30
drivers/pwm/core.c
View File

@@ -708,6 +708,36 @@ struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
} }
EXPORT_SYMBOL_GPL(devm_pwm_get); EXPORT_SYMBOL_GPL(devm_pwm_get);
/**
* devm_of_pwm_get() - resource managed of_pwm_get()
* @dev: device for PWM consumer
* @np: device node to get the PWM from
* @con_id: consumer name
*
* This function performs like of_pwm_get() but the acquired PWM device will
* automatically be released on driver detach.
*/
struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
const char *con_id)
{
struct pwm_device **ptr, *pwm;
ptr = devres_alloc(devm_pwm_release, sizeof(**ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
pwm = of_pwm_get(np, con_id);
if (!IS_ERR(pwm)) {
*ptr = pwm;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return pwm;
}
EXPORT_SYMBOL_GPL(devm_of_pwm_get);
static int devm_pwm_match(struct device *dev, void *res, void *data) static int devm_pwm_match(struct device *dev, void *res, void *data)
{ {
struct pwm_device **p = res; struct pwm_device **p = res;

9
include/linux/pwm.h
View File

@@ -179,6 +179,8 @@ struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id);
void pwm_put(struct pwm_device *pwm); void pwm_put(struct pwm_device *pwm);
struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id); struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id);
struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
const char *con_id);
void devm_pwm_put(struct device *dev, struct pwm_device *pwm); void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
#else #else
static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data) static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
@@ -230,6 +232,13 @@ static inline struct pwm_device *devm_pwm_get(struct device *dev,
return ERR_PTR(-ENODEV); return ERR_PTR(-ENODEV);
} }
static inline struct pwm_device *devm_of_pwm_get(struct device *dev,
struct device_node *np,
const char *con_id)
{
return ERR_PTR(-ENODEV);
}
static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm) static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
{ {
} }