1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2013 STMicroelectronics (R&D) Limited 4 * Author: Stephen Gallimore <stephen.gallimore@st.com> 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 */ 66