| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * Copyright (C) 2013 STMicroelectronics (R&D) Limited |
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| 4 | * Author: Stephen Gallimore <stephen.gallimore@st.com> |
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| 5 | */ |
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| 6 | #ifndef __STI_RESET_SYSCFG_H |
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| 7 | #define __STI_RESET_SYSCFG_H |
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| 8 | |
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| 9 | #include <linux/device.h> |
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| 10 | #include <linux/regmap.h> |
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| 11 | #include <linux/reset-controller.h> |
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| 12 | |
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| 13 | /** |
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| 14 | * Reset channel description for a system configuration register based |
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| 15 | * reset controller. |
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| 16 | * |
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| 17 | * @compatible: Compatible string of the syscon regmap containing this |
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| 18 | * channel's control and ack (status) bits. |
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| 19 | * @reset: Regmap field description of the channel's reset bit. |
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| 20 | * @ack: Regmap field description of the channel's acknowledge bit. |
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| 21 | */ |
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| 22 | struct syscfg_reset_channel_data { |
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| 23 | const char *compatible; |
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| 24 | struct reg_field reset; |
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| 25 | struct reg_field ack; |
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| 26 | }; |
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| 27 | |
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| 28 | #define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab) \ |
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| 29 | { .compatible = _c, \ |
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| 30 | .reset = REG_FIELD(_rr, _rb, _rb), \ |
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| 31 | .ack = REG_FIELD(_ar, _ab, _ab), } |
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| 32 | |
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| 33 | #define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb) \ |
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| 34 | { .compatible = _c, \ |
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| 35 | .reset = REG_FIELD(_rr, _rb, _rb), } |
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| 36 | |
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| 37 | /** |
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| 38 | * Description of a system configuration register based reset controller. |
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| 39 | * |
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| 40 | * @wait_for_ack: The controller will wait for reset assert and de-assert to |
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| 41 | * be "ack'd" in a channel's ack field. |
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| 42 | * @active_low: Are the resets in this controller active low, i.e. clearing |
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| 43 | * the reset bit puts the hardware into reset. |
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| 44 | * @nr_channels: The number of reset channels in this controller. |
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| 45 | * @channels: An array of reset channel descriptions. |
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| 46 | */ |
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| 47 | struct syscfg_reset_controller_data { |
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| 48 | bool wait_for_ack; |
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| 49 | bool active_low; |
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| 50 | int nr_channels; |
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| 51 | const struct syscfg_reset_channel_data *channels; |
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| 52 | }; |
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| 53 | |
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| 54 | /** |
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| 55 | * syscfg_reset_probe(): platform device probe function used by syscfg |
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| 56 | * reset controller drivers. This registers a reset |
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| 57 | * controller configured by the OF match data for |
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| 58 | * the compatible device which should be of type |
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| 59 | * "struct syscfg_reset_controller_data". |
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| 60 | * |
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| 61 | * @pdev: platform device |
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| 62 | */ |
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| 63 | int syscfg_reset_probe(struct platform_device *pdev); |
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| 64 | |
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| 65 | #endif /* __STI_RESET_SYSCFG_H */ |
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| 66 | |
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