reset: make device_reset_optional() really optional

Commit bb475230 ("reset: make optional functions really optional")
converted *_get_optional* functions, but device_reset_optional() was
left behind.  Convert it in the same way.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/reset/core.c

@@ -566,17 +566,18 @@ EXPORT_SYMBOL_GPL(__devm_reset_control_get);
  * device_reset - find reset controller associated with the device
  *                and perform reset
  * @dev: device to be reset by the controller
+ * @optional: whether it is optional to reset the device
  *
- * Convenience wrapper for reset_control_get() and reset_control_reset().
+ * Convenience wrapper for __reset_control_get() and reset_control_reset().
  * This is useful for the common case of devices with single, dedicated reset
  * lines.
  */
-int device_reset(struct device *dev)
+int __device_reset(struct device *dev, bool optional)
 {
 	struct reset_control *rstc;
 	int ret;
 
-	rstc = reset_control_get(dev, NULL);
+	rstc = __reset_control_get(dev, NULL, 0, 0, optional);
 	if (IS_ERR(rstc))
 		return PTR_ERR(rstc);
 
@@ -586,7 +587,7 @@ int device_reset(struct device *dev)
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(device_reset);
+EXPORT_SYMBOL_GPL(__device_reset);
 
 /**
  * APIs to manage an array of reset controls.

include/linux/reset.h

@@ -20,22 +20,16 @@ struct reset_control *__reset_control_get(struct device *dev, const char *id,
 					  int index, bool shared,
 					  bool optional);
 void reset_control_put(struct reset_control *rstc);
+int __device_reset(struct device *dev, bool optional);
 struct reset_control *__devm_reset_control_get(struct device *dev,
 				     const char *id, int index, bool shared,
 				     bool optional);
 
-int __must_check device_reset(struct device *dev);
-
 struct reset_control *devm_reset_control_array_get(struct device *dev,
 						   bool shared, bool optional);
 struct reset_control *of_reset_control_array_get(struct device_node *np,
 						 bool shared, bool optional);
 
-static inline int device_reset_optional(struct device *dev)
-{
-	return device_reset(dev);
-}
-
 #else
 
 static inline int reset_control_reset(struct reset_control *rstc)
@@ -62,15 +56,9 @@ static inline void reset_control_put(struct reset_control *rstc)
 {
 }
 
-static inline int __must_check device_reset(struct device *dev)
+static inline int __device_reset(struct device *dev, bool optional)
 {
-	WARN_ON(1);
-	return -ENOTSUPP;
-}
-
-static inline int device_reset_optional(struct device *dev)
-{
-	return -ENOTSUPP;
+	return optional ? 0 : -ENOTSUPP;
 }
 
 static inline struct reset_control *__of_reset_control_get(
@@ -109,6 +97,16 @@ of_reset_control_array_get(struct device_node *np, bool shared, bool optional)
 
 #endif /* CONFIG_RESET_CONTROLLER */
 
+static inline int __must_check device_reset(struct device *dev)
+{
+	return __device_reset(dev, false);
+}
+
+static inline int device_reset_optional(struct device *dev)
+{
+	return __device_reset(dev, true);
+}
+
 /**
  * reset_control_get_exclusive - Lookup and obtain an exclusive reference
  *                               to a reset controller.