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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 <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Signed-off-by: Bryan Wu <[email protected]>
This commit is contained in:
Peter Ujfalusi 2012-12-21 01:43:59 -08:00 • committed by Bryan Wu
commit 261a5edd3a
2 changed files with 39 additions and 0 deletions
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30
drivers/pwm/core.c
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@ -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;