1 files changed, 114 insertions, 0 deletions
diff --git a/include/linux/reset-controller.h b/include/linux/reset-controller.h
new file mode 100644
index 000000000..0fa4f60e1
--- /dev/null
+++ b/include/linux/reset-controller.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_RESET_CONTROLLER_H_
+#define _LINUX_RESET_CONTROLLER_H_
+
+#include <linux/list.h>
+
+struct reset_controller_dev;
+
+/**
+ * struct reset_control_ops - reset controller driver callbacks
+ *
+ * @reset: for self-deasserting resets, does all necessary
+ *         things to reset the device
+ * @assert: manually assert the reset line, if supported
+ * @deassert: manually deassert the reset line, if supported
+ * @status: return the status of the reset line, if supported
+ */
+struct reset_control_ops {
+	int (*reset)(struct reset_controller_dev *rcdev, unsigned long id);
+	int (*assert)(struct reset_controller_dev *rcdev, unsigned long id);
+	int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id);
+	int (*status)(struct reset_controller_dev *rcdev, unsigned long id);
+};
+
+struct module;
+struct device_node;
+struct of_phandle_args;
+
+/**
+ * struct reset_control_lookup - represents a single lookup entry
+ *
+ * @list: internal list of all reset lookup entries
+ * @provider: name of the reset controller device controlling this reset line
+ * @index: ID of the reset controller in the reset controller device
+ * @dev_id: name of the device associated with this reset line
+ * @con_id: name of the reset line (can be NULL)
+ */
+struct reset_control_lookup {
+	struct list_head list;
+	const char *provider;
+	unsigned int index;
+	const char *dev_id;
+	const char *con_id;
+};
+
+#define RESET_LOOKUP(_provider, _index, _dev_id, _con_id)		\
+	{								\
+		.provider = _provider,					\
+		.index = _index,					\
+		.dev_id = _dev_id,					\
+		.con_id = _con_id,					\
+	}
+
+/**
+ * struct reset_controller_dev - reset controller entity that might
+ *                               provide multiple reset controls
+ * @ops: a pointer to device specific struct reset_control_ops
+ * @owner: kernel module of the reset controller driver
+ * @list: internal list of reset controller devices
+ * @reset_control_head: head of internal list of requested reset controls
+ * @dev: corresponding driver model device struct
+ * @of_node: corresponding device tree node as phandle target
+ * @of_reset_n_cells: number of cells in reset line specifiers
+ * @of_xlate: translation function to translate from specifier as found in the
+ *            device tree to id as given to the reset control ops, defaults
+ *            to :c:func:`of_reset_simple_xlate`.
+ * @nr_resets: number of reset controls in this reset controller device
+ */
+struct reset_controller_dev {
+	const struct reset_control_ops *ops;
+	struct module *owner;
+	struct list_head list;
+	struct list_head reset_control_head;
+	struct device *dev;
+	struct device_node *of_node;
+	int of_reset_n_cells;
+	int (*of_xlate)(struct reset_controller_dev *rcdev,
+			const struct of_phandle_args *reset_spec);
+	unsigned int nr_resets;
+};
+
+#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
+int reset_controller_register(struct reset_controller_dev *rcdev);
+void reset_controller_unregister(struct reset_controller_dev *rcdev);
+
+struct device;
+int devm_reset_controller_register(struct device *dev,
+				   struct reset_controller_dev *rcdev);
+
+void reset_controller_add_lookup(struct reset_control_lookup *lookup,
+				 unsigned int num_entries);
+#else
+static inline int reset_controller_register(struct reset_controller_dev *rcdev)
+{
+	return 0;
+}
+
+static inline void reset_controller_unregister(struct reset_controller_dev *rcdev)
+{
+}
+
+static inline int devm_reset_controller_register(struct device *dev,
+						 struct reset_controller_dev *rcdev)
+{
+	return 0;
+}
+
+static inline void reset_controller_add_lookup(struct reset_control_lookup *lookup,
+					       unsigned int num_entries)
+{
+}
+#endif
+
+#endif