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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
e5d76075 SG |
2 | /* |
3 | * Copyright (C) 2013 STMicroelectronics (R&D) Limited | |
4 | * Author: Stephen Gallimore <stephen.gallimore@st.com> | |
e5d76075 SG |
5 | */ |
6 | #ifndef __STI_RESET_SYSCFG_H | |
7 | #define __STI_RESET_SYSCFG_H | |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/regmap.h> | |
11 | #include <linux/reset-controller.h> | |
12 | ||
13 | /** | |
14 | * Reset channel description for a system configuration register based | |
15 | * reset controller. | |
16 | * | |
17 | * @compatible: Compatible string of the syscon regmap containing this | |
18 | * channel's control and ack (status) bits. | |
19 | * @reset: Regmap field description of the channel's reset bit. | |
20 | * @ack: Regmap field description of the channel's acknowledge bit. | |
21 | */ | |
22 | struct syscfg_reset_channel_data { | |
23 | const char *compatible; | |
24 | struct reg_field reset; | |
25 | struct reg_field ack; | |
26 | }; | |
27 | ||
28 | #define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab) \ | |
29 | { .compatible = _c, \ | |
30 | .reset = REG_FIELD(_rr, _rb, _rb), \ | |
31 | .ack = REG_FIELD(_ar, _ab, _ab), } | |
32 | ||
33 | #define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb) \ | |
34 | { .compatible = _c, \ | |
35 | .reset = REG_FIELD(_rr, _rb, _rb), } | |
36 | ||
37 | /** | |
38 | * Description of a system configuration register based reset controller. | |
39 | * | |
40 | * @wait_for_ack: The controller will wait for reset assert and de-assert to | |
41 | * be "ack'd" in a channel's ack field. | |
42 | * @active_low: Are the resets in this controller active low, i.e. clearing | |
43 | * the reset bit puts the hardware into reset. | |
44 | * @nr_channels: The number of reset channels in this controller. | |
45 | * @channels: An array of reset channel descriptions. | |
46 | */ | |
47 | struct syscfg_reset_controller_data { | |
48 | bool wait_for_ack; | |
49 | bool active_low; | |
50 | int nr_channels; | |
51 | const struct syscfg_reset_channel_data *channels; | |
52 | }; | |
53 | ||
54 | /** | |
55 | * syscfg_reset_probe(): platform device probe function used by syscfg | |
56 | * reset controller drivers. This registers a reset | |
57 | * controller configured by the OF match data for | |
58 | * the compatible device which should be of type | |
59 | * "struct syscfg_reset_controller_data". | |
60 | * | |
61 | * @pdev: platform device | |
62 | */ | |
63 | int syscfg_reset_probe(struct platform_device *pdev); | |
64 | ||
65 | #endif /* __STI_RESET_SYSCFG_H */ |