1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*/
#ifndef _RESET_UCLASS_H
#define _RESET_UCLASS_H
/* See reset.h for background documentation. */
#include <reset.h>
struct ofnode_phandle_args;
struct udevice;
/**
* struct reset_ops - The functions that a reset controller driver must
* implement.
*/
struct reset_ops {
/**
* of_xlate - Translate a client's device-tree (OF) reset specifier.
*
* The reset core calls this function as the first step in implementing
* a client's reset_get_by_*() call.
*
* If this function pointer is set to NULL, the reset core will use a
* default implementation, which assumes #reset-cells = <1>, and that
* the DT cell contains a simple integer reset signal ID.
*
* At present, the reset API solely supports device-tree. If this
* changes, other xxx_xlate() functions may be added to support those
* other mechanisms.
*
* @reset_ctl: The reset control struct to hold the translation result.
* @args: The reset specifier values from device tree.
* @return 0 if OK, or a negative error code.
*/
int (*of_xlate)(struct reset_ctl *reset_ctl,
struct ofnode_phandle_args *args);
/**
* request - Request a translated reset control.
*
* The reset core calls this function as the second step in
* implementing a client's reset_get_by_*() call, following a
* successful xxx_xlate() call.
*
* @reset_ctl: The reset control struct to request; this has been
* filled in by a previoux xxx_xlate() function call.
* @return 0 if OK, or a negative error code.
*/
int (*request)(struct reset_ctl *reset_ctl);
/**
* free - Free a previously requested reset control.
*
* This is the implementation of the client reset_free() API.
*
* @reset_ctl: The reset control to free.
* @return 0 if OK, or a negative error code.
*/
int (*free)(struct reset_ctl *reset_ctl);
/**
* rst_assert - Assert a reset signal.
*
* Note: This function is named rst_assert not assert to avoid
* conflicting with global macro assert().
*
* @reset_ctl: The reset signal to assert.
* @return 0 if OK, or a negative error code.
*/
int (*rst_assert)(struct reset_ctl *reset_ctl);
/**
* rst_deassert - Deassert a reset signal.
*
* @reset_ctl: The reset signal to deassert.
* @return 0 if OK, or a negative error code.
*/
int (*rst_deassert)(struct reset_ctl *reset_ctl);
/**
* rst_status - Check reset signal status.
*
* @reset_ctl: The reset signal to check.
* @return 0 if deasserted, positive if asserted, or a negative
* error code.
*/
int (*rst_status)(struct reset_ctl *reset_ctl);
};
#endif
|
