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Commit 261a5edd authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Bryan Wu
Browse files

pwm: Add devm_of_pwm_get() as exported API for users 



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

Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent 8eb96127

drivers/pwm/core.c

+30 −0
Original line number Diff line number Diff line
@@ -708,6 +708,36 @@ struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id) 
}

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)

{

	struct pwm_device **p = res;

include/linux/pwm.h

+9 −0
Original line number Diff line number Diff line
@@ -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);



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);

#else

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);

}



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)

{

}