1 /*
2  * Copyright (c) 2016, NVIDIA CORPORATION.
3  *
4  * SPDX-License-Identifier: GPL-2.0
5  */
6 
7 #ifndef _POWER_DOMAIN_UCLASS_H
8 #define _POWER_DOMAIN_UCLASS_H
9 
10 /* See power-domain.h for background documentation. */
11 
12 #include <power-domain.h>
13 
14 struct udevice;
15 
16 /**
17  * struct power_domain_ops - The functions that a power domain controller driver
18  * must implement.
19  */
20 struct power_domain_ops {
21 	/**
22 	 * of_xlate - Translate a client's device-tree (OF) power domain
23 	 * specifier.
24 	 *
25 	 * The power domain core calls this function as the first step in
26 	 * implementing a client's power_domain_get() call.
27 	 *
28 	 * If this function pointer is set to NULL, the power domain core will
29 	 * use a default implementation, which assumes #power-domain-cells =
30 	 * <1>, and that the DT cell contains a simple integer power domain ID.
31 	 *
32 	 * At present, the power domain API solely supports device-tree. If
33 	 * this changes, other xxx_xlate() functions may be added to support
34 	 * those other mechanisms.
35 	 *
36 	 * @power_domain:	The power domain struct to hold the
37 	 *			translation result.
38 	 * @args:		The power domain specifier values from device
39 	 *			tree.
40 	 * @return 0 if OK, or a negative error code.
41 	 */
42 	int (*of_xlate)(struct power_domain *power_domain,
43 			struct fdtdec_phandle_args *args);
44 	/**
45 	 * request - Request a translated power domain.
46 	 *
47 	 * The power domain core calls this function as the second step in
48 	 * implementing a client's power_domain_get() call, following a
49 	 * successful xxx_xlate() call.
50 	 *
51 	 * @power_domain:	The power domain to request; this has been
52 	 *			filled in by a previous xxx_xlate() function
53 	 *			call.
54 	 * @return 0 if OK, or a negative error code.
55 	 */
56 	int (*request)(struct power_domain *power_domain);
57 	/**
58 	 * free - Free a previously requested power domain.
59 	 *
60 	 * This is the implementation of the client power_domain_free() API.
61 	 *
62 	 * @power_domain:	The power domain to free.
63 	 * @return 0 if OK, or a negative error code.
64 	 */
65 	int (*free)(struct power_domain *power_domain);
66 	/**
67 	 * on - Power on a power domain.
68 	 *
69 	 * @power_domain:	The power domain to turn on.
70 	 * @return 0 if OK, or a negative error code.
71 	 */
72 	int (*on)(struct power_domain *power_domain);
73 	/**
74 	 * off - Power off a power domain.
75 	 *
76 	 * @power_domain:	The power domain to turn off.
77 	 * @return 0 if OK, or a negative error code.
78 	 */
79 	int (*off)(struct power_domain *power_domain);
80 };
81 
82 #endif
83