blob: 38c716ff8953cfe364b68f4b8124587fdaeaf582 [file] [log] [blame]
Stephen Warren89c1e2d2016-06-17 09:43:58 -06001/*
2 * Copyright (c) 2016, NVIDIA CORPORATION.
3 *
4 * SPDX-License-Identifier: GPL-2.0
5 */
6
7#ifndef _RESET_UCLASS_H
8#define _RESET_UCLASS_H
9
10/* See reset.h for background documentation. */
11
12#include <reset.h>
13
Masahiro Yamadad9f5d992016-10-08 13:25:30 +090014struct fdtdec_phandle_args;
Stephen Warren89c1e2d2016-06-17 09:43:58 -060015struct udevice;
16
17/**
18 * struct reset_ops - The functions that a reset controller driver must
19 * implement.
20 */
21struct reset_ops {
22 /**
23 * of_xlate - Translate a client's device-tree (OF) reset specifier.
24 *
25 * The reset core calls this function as the first step in implementing
26 * a client's reset_get_by_*() call.
27 *
28 * If this function pointer is set to NULL, the reset core will use a
29 * default implementation, which assumes #reset-cells = <1>, and that
30 * the DT cell contains a simple integer reset signal ID.
31 *
32 * At present, the reset API solely supports device-tree. If this
33 * changes, other xxx_xlate() functions may be added to support those
34 * other mechanisms.
35 *
36 * @reset_ctl: The reset control struct to hold the translation result.
37 * @args: The reset specifier values from device tree.
38 * @return 0 if OK, or a negative error code.
39 */
40 int (*of_xlate)(struct reset_ctl *reset_ctl,
41 struct fdtdec_phandle_args *args);
42 /**
43 * request - Request a translated reset control.
44 *
45 * The reset core calls this function as the second step in
46 * implementing a client's reset_get_by_*() call, following a
47 * successful xxx_xlate() call.
48 *
49 * @reset_ctl: The reset control struct to request; this has been
50 * filled in by a previoux xxx_xlate() function call.
51 * @return 0 if OK, or a negative error code.
52 */
53 int (*request)(struct reset_ctl *reset_ctl);
54 /**
55 * free - Free a previously requested reset control.
56 *
57 * This is the implementation of the client reset_free() API.
58 *
59 * @reset_ctl: The reset control to free.
60 * @return 0 if OK, or a negative error code.
61 */
62 int (*free)(struct reset_ctl *reset_ctl);
63 /**
64 * rst_assert - Assert a reset signal.
65 *
66 * Note: This function is named rst_assert not assert to avoid
67 * conflicting with global macro assert().
68 *
69 * @reset_ctl: The reset signal to assert.
70 * @return 0 if OK, or a negative error code.
71 */
72 int (*rst_assert)(struct reset_ctl *reset_ctl);
73 /**
74 * rst_deassert - Deassert a reset signal.
75 *
76 * @reset_ctl: The reset signal to deassert.
77 * @return 0 if OK, or a negative error code.
78 */
79 int (*rst_deassert)(struct reset_ctl *reset_ctl);
80};
81
82#endif