1 /* 2 * Copyright (C) 2013 STMicroelectronics (R&D) Limited 3 * Author: Stephen Gallimore <stephen.gallimore@st.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 */ 10 #ifndef __STI_RESET_SYSCFG_H 11 #define __STI_RESET_SYSCFG_H 12 13 #include <linux/device.h> 14 #include <linux/regmap.h> 15 #include <linux/reset-controller.h> 16 17 /** 18 * Reset channel description for a system configuration register based 19 * reset controller. 20 * 21 * @compatible: Compatible string of the syscon regmap containing this 22 * channel's control and ack (status) bits. 23 * @reset: Regmap field description of the channel's reset bit. 24 * @ack: Regmap field description of the channel's acknowledge bit. 25 */ 26 struct syscfg_reset_channel_data { 27 const char *compatible; 28 struct reg_field reset; 29 struct reg_field ack; 30 }; 31 32 #define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab) \ 33 { .compatible = _c, \ 34 .reset = REG_FIELD(_rr, _rb, _rb), \ 35 .ack = REG_FIELD(_ar, _ab, _ab), } 36 37 #define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb) \ 38 { .compatible = _c, \ 39 .reset = REG_FIELD(_rr, _rb, _rb), } 40 41 /** 42 * Description of a system configuration register based reset controller. 43 * 44 * @wait_for_ack: The controller will wait for reset assert and de-assert to 45 * be "ack'd" in a channel's ack field. 46 * @active_low: Are the resets in this controller active low, i.e. clearing 47 * the reset bit puts the hardware into reset. 48 * @nr_channels: The number of reset channels in this controller. 49 * @channels: An array of reset channel descriptions. 50 */ 51 struct syscfg_reset_controller_data { 52 bool wait_for_ack; 53 bool active_low; 54 int nr_channels; 55 const struct syscfg_reset_channel_data *channels; 56 }; 57 58 /** 59 * syscfg_reset_probe(): platform device probe function used by syscfg 60 * reset controller drivers. This registers a reset 61 * controller configured by the OF match data for 62 * the compatible device which should be of type 63 * "struct syscfg_reset_controller_data". 64 * 65 * @pdev: platform device 66 */ 67 int syscfg_reset_probe(struct platform_device *pdev); 68 69 #endif /* __STI_RESET_SYSCFG_H */ 70