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@xxxxxx>
---
drivers/pwm/core.c | 30 ++++++++++++++++++++++++++++++
include/linux/pwm.h | 9 +++++++++
2 files changed, 39 insertions(+)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 3cb741d..4a13da4 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -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;
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 76a1959..70655a2 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -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)
{
}
--
1.8.0
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
