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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_RESET_CONTROLLER_H_
3#define _LINUX_RESET_CONTROLLER_H_
4
5#include <linux/list.h>
6
7struct reset_controller_dev;
8
9/**
10 * struct reset_control_ops - reset controller driver callbacks
11 *
12 * @reset: for self-deasserting resets, does all necessary
13 * things to reset the device
14 * @assert: manually assert the reset line, if supported
15 * @deassert: manually deassert the reset line, if supported
16 * @status: return the status of the reset line, if supported
17 */
18struct reset_control_ops {
19 int (*reset)(struct reset_controller_dev *rcdev, unsigned long id);
20 int (*assert)(struct reset_controller_dev *rcdev, unsigned long id);
21 int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id);
22 int (*status)(struct reset_controller_dev *rcdev, unsigned long id);
23};
24
25struct module;
26struct device_node;
27struct of_phandle_args;
28
29/**
30 * struct reset_controller_dev - reset controller entity that might
31 * provide multiple reset controls
32 * @ops: a pointer to device specific struct reset_control_ops
33 * @owner: kernel module of the reset controller driver
34 * @list: internal list of reset controller devices
35 * @reset_control_head: head of internal list of requested reset controls
36 * @dev: corresponding driver model device struct
37 * @of_node: corresponding device tree node as phandle target
38 * @of_args: for reset-gpios controllers: corresponding phandle args with
39 * of_node and GPIO number complementing of_node; either this or
40 * of_node should be present
41 * @of_reset_n_cells: number of cells in reset line specifiers
42 * @of_xlate: translation function to translate from specifier as found in the
43 * device tree to id as given to the reset control ops, defaults
44 * to :c:func:`of_reset_simple_xlate`.
45 * @nr_resets: number of reset controls in this reset controller device
46 */
47struct reset_controller_dev {
48 const struct reset_control_ops *ops;
49 struct module *owner;
50 struct list_head list;
51 struct list_head reset_control_head;
52 struct device *dev;
53 struct device_node *of_node;
54 const struct of_phandle_args *of_args;
55 int of_reset_n_cells;
56 int (*of_xlate)(struct reset_controller_dev *rcdev,
57 const struct of_phandle_args *reset_spec);
58 unsigned int nr_resets;
59};
60
61#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
62int reset_controller_register(struct reset_controller_dev *rcdev);
63void reset_controller_unregister(struct reset_controller_dev *rcdev);
64
65struct device;
66int devm_reset_controller_register(struct device *dev,
67 struct reset_controller_dev *rcdev);
68#else
69static inline int reset_controller_register(struct reset_controller_dev *rcdev)
70{
71 return 0;
72}
73
74static inline void reset_controller_unregister(struct reset_controller_dev *rcdev)
75{
76}
77
78static inline int devm_reset_controller_register(struct device *dev,
79 struct reset_controller_dev *rcdev)
80{
81 return 0;
82}
83#endif
84
85#endif