1 files changed, 283 insertions, 34 deletions

diff --git a/include/linux/reset.h b/include/linux/reset.h
index c4c097de0..45a4abeb6 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -1,8 +1,8 @@
 #ifndef _LINUX_RESET_H_
 #define _LINUX_RESET_H_
 
-struct device;
-struct device_node;
+#include <linux/device.h>
+
 struct reset_control;
 
 #ifdef CONFIG_RESET_CONTROLLER
@@ -12,9 +12,11 @@ int reset_control_assert(struct reset_control *rstc);
 int reset_control_deassert(struct reset_control *rstc);
 int reset_control_status(struct reset_control *rstc);
 
-struct reset_control *reset_control_get(struct device *dev, const char *id);
+struct reset_control *__of_reset_control_get(struct device_node *node,
+				     const char *id, int index, int shared);
 void reset_control_put(struct reset_control *rstc);
-struct reset_control *devm_reset_control_get(struct device *dev, const char *id);
+struct reset_control *__devm_reset_control_get(struct device *dev,
+				     const char *id, int index, int shared);
 
 int __must_check device_reset(struct device *dev);
 
@@ -23,24 +25,6 @@ static inline int device_reset_optional(struct device *dev)
 	return device_reset(dev);
 }
 
-static inline struct reset_control *reset_control_get_optional(
-					struct device *dev, const char *id)
-{
-	return reset_control_get(dev, id);
-}
-
-static inline struct reset_control *devm_reset_control_get_optional(
-					struct device *dev, const char *id)
-{
-	return devm_reset_control_get(dev, id);
-}
-
-struct reset_control *of_reset_control_get(struct device_node *node,
-					   const char *id);
-
-struct reset_control *of_reset_control_get_by_index(
-					struct device_node *node, int index);
-
 #else
 
 static inline int reset_control_reset(struct reset_control *rstc)
@@ -72,49 +56,314 @@ static inline void reset_control_put(struct reset_control *rstc)
 	WARN_ON(1);
 }
 
+static inline int __must_check device_reset(struct device *dev)
+{
+	WARN_ON(1);
+	return -ENOTSUPP;
+}
+
 static inline int device_reset_optional(struct device *dev)
 {
 	return -ENOTSUPP;
 }
 
-static inline struct reset_control *__must_check reset_control_get(
-					struct device *dev, const char *id)
+static inline struct reset_control *__of_reset_control_get(
+					struct device_node *node,
+					const char *id, int index, int shared)
+{
+	return ERR_PTR(-EINVAL);
+}
+
+static inline struct reset_control *__devm_reset_control_get(
+					struct device *dev,
+					const char *id, int index, int shared)
 {
-	WARN_ON(1);
 	return ERR_PTR(-EINVAL);
 }
 
-static inline struct reset_control *__must_check devm_reset_control_get(
+#endif /* CONFIG_RESET_CONTROLLER */
+
+/**
+ * reset_control_get_exclusive - Lookup and obtain an exclusive reference
+ *                               to a reset controller.
+ * @dev: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ * If this function is called more then once for the same reset_control it will
+ * return -EBUSY.
+ *
+ * See reset_control_get_shared for details on shared references to
+ * reset-controls.
+ *
+ * Use of id names is optional.
+ */
+static inline struct reset_control *
+__must_check reset_control_get_exclusive(struct device *dev, const char *id)
+{
+#ifndef CONFIG_RESET_CONTROLLER
+	WARN_ON(1);
+#endif
+	return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0, 0);
+}
+
+/**
+ * reset_control_get_shared - Lookup and obtain a shared reference to a
+ *                            reset controller.
+ * @dev: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ * This function is intended for use with reset-controls which are shared
+ * between hardware-blocks.
+ *
+ * When a reset-control is shared, the behavior of reset_control_assert /
+ * deassert is changed, the reset-core will keep track of a deassert_count
+ * and only (re-)assert the reset after reset_control_assert has been called
+ * as many times as reset_control_deassert was called. Also see the remark
+ * about shared reset-controls in the reset_control_assert docs.
+ *
+ * Calling reset_control_assert without first calling reset_control_deassert
+ * is not allowed on a shared reset control. Calling reset_control_reset is
+ * also not allowed on a shared reset control.
+ *
+ * Use of id names is optional.
+ */
+static inline struct reset_control *reset_control_get_shared(
+					struct device *dev, const char *id)
+{
+	return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0, 1);
+}
+
+static inline struct reset_control *reset_control_get_optional_exclusive(
+					struct device *dev, const char *id)
+{
+	return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0, 0);
+}
+
+static inline struct reset_control *reset_control_get_optional_shared(
 					struct device *dev, const char *id)
 {
+	return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0, 1);
+}
+
+/**
+ * of_reset_control_get_exclusive - Lookup and obtain an exclusive reference
+ *                                  to a reset controller.
+ * @node: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * Use of id names is optional.
+ */
+static inline struct reset_control *of_reset_control_get_exclusive(
+				struct device_node *node, const char *id)
+{
+	return __of_reset_control_get(node, id, 0, 0);
+}
+
+/**
+ * of_reset_control_get_shared - Lookup and obtain an shared reference
+ *                               to a reset controller.
+ * @node: device to be reset by the controller
+ * @id: reset line name
+ *
+ * When a reset-control is shared, the behavior of reset_control_assert /
+ * deassert is changed, the reset-core will keep track of a deassert_count
+ * and only (re-)assert the reset after reset_control_assert has been called
+ * as many times as reset_control_deassert was called. Also see the remark
+ * about shared reset-controls in the reset_control_assert docs.
+ *
+ * Calling reset_control_assert without first calling reset_control_deassert
+ * is not allowed on a shared reset control. Calling reset_control_reset is
+ * also not allowed on a shared reset control.
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * Use of id names is optional.
+ */
+static inline struct reset_control *of_reset_control_get_shared(
+				struct device_node *node, const char *id)
+{
+	return __of_reset_control_get(node, id, 0, 1);
+}
+
+/**
+ * of_reset_control_get_exclusive_by_index - Lookup and obtain an exclusive
+ *                                           reference to a reset controller
+ *                                           by index.
+ * @node: device to be reset by the controller
+ * @index: index of the reset controller
+ *
+ * This is to be used to perform a list of resets for a device or power domain
+ * in whatever order. Returns a struct reset_control or IS_ERR() condition
+ * containing errno.
+ */
+static inline struct reset_control *of_reset_control_get_exclusive_by_index(
+					struct device_node *node, int index)
+{
+	return __of_reset_control_get(node, NULL, index, 0);
+}
+
+/**
+ * of_reset_control_get_shared_by_index - Lookup and obtain an shared
+ *                                        reference to a reset controller
+ *                                        by index.
+ * @node: device to be reset by the controller
+ * @index: index of the reset controller
+ *
+ * When a reset-control is shared, the behavior of reset_control_assert /
+ * deassert is changed, the reset-core will keep track of a deassert_count
+ * and only (re-)assert the reset after reset_control_assert has been called
+ * as many times as reset_control_deassert was called. Also see the remark
+ * about shared reset-controls in the reset_control_assert docs.
+ *
+ * Calling reset_control_assert without first calling reset_control_deassert
+ * is not allowed on a shared reset control. Calling reset_control_reset is
+ * also not allowed on a shared reset control.
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * This is to be used to perform a list of resets for a device or power domain
+ * in whatever order. Returns a struct reset_control or IS_ERR() condition
+ * containing errno.
+ */
+static inline struct reset_control *of_reset_control_get_shared_by_index(
+					struct device_node *node, int index)
+{
+	return __of_reset_control_get(node, NULL, index, 1);
+}
+
+/**
+ * devm_reset_control_get_exclusive - resource managed
+ *                                    reset_control_get_exclusive()
+ * @dev: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Managed reset_control_get_exclusive(). For reset controllers returned
+ * from this function, reset_control_put() is called automatically on driver
+ * detach.
+ *
+ * See reset_control_get_exclusive() for more information.
+ */
+static inline struct reset_control *
+__must_check devm_reset_control_get_exclusive(struct device *dev,
+					      const char *id)
+{
+#ifndef CONFIG_RESET_CONTROLLER
 	WARN_ON(1);
-	return ERR_PTR(-EINVAL);
+#endif
+	return __devm_reset_control_get(dev, id, 0, 0);
 }
 
-static inline struct reset_control *reset_control_get_optional(
+/**
+ * devm_reset_control_get_shared - resource managed reset_control_get_shared()
+ * @dev: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Managed reset_control_get_shared(). For reset controllers returned from
+ * this function, reset_control_put() is called automatically on driver detach.
+ * See reset_control_get_shared() for more information.
+ */
+static inline struct reset_control *devm_reset_control_get_shared(
 					struct device *dev, const char *id)
 {
-	return ERR_PTR(-ENOTSUPP);
+	return __devm_reset_control_get(dev, id, 0, 1);
 }
 
-static inline struct reset_control *devm_reset_control_get_optional(
+static inline struct reset_control *devm_reset_control_get_optional_exclusive(
+					struct device *dev, const char *id)
+{
+	return __devm_reset_control_get(dev, id, 0, 0);
+}
+
+static inline struct reset_control *devm_reset_control_get_optional_shared(
+					struct device *dev, const char *id)
+{
+	return __devm_reset_control_get(dev, id, 0, 1);
+}
+
+/**
+ * devm_reset_control_get_exclusive_by_index - resource managed
+ *                                             reset_control_get_exclusive()
+ * @dev: device to be reset by the controller
+ * @index: index of the reset controller
+ *
+ * Managed reset_control_get_exclusive(). For reset controllers returned from
+ * this function, reset_control_put() is called automatically on driver
+ * detach.
+ *
+ * See reset_control_get_exclusive() for more information.
+ */
+static inline struct reset_control *
+devm_reset_control_get_exclusive_by_index(struct device *dev, int index)
+{
+	return __devm_reset_control_get(dev, NULL, index, 0);
+}
+
+/**
+ * devm_reset_control_get_shared_by_index - resource managed
+ * reset_control_get_shared
+ * @dev: device to be reset by the controller
+ * @index: index of the reset controller
+ *
+ * Managed reset_control_get_shared(). For reset controllers returned from
+ * this function, reset_control_put() is called automatically on driver detach.
+ * See reset_control_get_shared() for more information.
+ */
+static inline struct reset_control *
+devm_reset_control_get_shared_by_index(struct device *dev, int index)
+{
+	return __devm_reset_control_get(dev, NULL, index, 1);
+}
+
+/*
+ * TEMPORARY calls to use during transition:
+ *
+ *   of_reset_control_get() => of_reset_control_get_exclusive()
+ *
+ * These inline function calls will be removed once all consumers
+ * have been moved over to the new explicit API.
+ */
+static inline struct reset_control *reset_control_get(
+				struct device *dev, const char *id)
+{
+	return reset_control_get_exclusive(dev, id);
+}
+
+static inline struct reset_control *reset_control_get_optional(
 					struct device *dev, const char *id)
 {
-	return ERR_PTR(-ENOTSUPP);
+	return reset_control_get_optional_exclusive(dev, id);
 }
 
 static inline struct reset_control *of_reset_control_get(
 				struct device_node *node, const char *id)
 {
-	return ERR_PTR(-ENOTSUPP);
+	return of_reset_control_get_exclusive(node, id);
 }
 
 static inline struct reset_control *of_reset_control_get_by_index(
 				struct device_node *node, int index)
 {
-	return ERR_PTR(-ENOTSUPP);
+	return of_reset_control_get_exclusive_by_index(node, index);
 }
 
-#endif /* CONFIG_RESET_CONTROLLER */
+static inline struct reset_control *devm_reset_control_get(
+				struct device *dev, const char *id)
+{
+	return devm_reset_control_get_exclusive(dev, id);
+}
 
+static inline struct reset_control *devm_reset_control_get_optional(
+				struct device *dev, const char *id)
+{
+	return devm_reset_control_get_optional_exclusive(dev, id);
+
+}
+
+static inline struct reset_control *devm_reset_control_get_by_index(
+				struct device *dev, int index)
+{
+	return devm_reset_control_get_exclusive_by_index(dev, index);
+}
 #endif