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: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

2 files changed, 39 insertions, 0 deletions

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 3cb741dc2038..4a13da48fefe 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 76a1959f2b23..70655a205b74 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)
 {
 }