Release 4.17 include/linux/reset-controller.h

/* 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: 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
 * @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;
};

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);

#endif
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