1 // SPDX-License-Identifier: GPL-2.0-or-later
6  * Inspired by mach-imx/src.c
18 #include "reset-syscfg.h"
21  * struct syscfg_reset_channel - Reset channel regmap configuration
32  * struct syscfg_reset_controller - A reset controller which groups together
36  * @rst: base reset controller structure.
42 	struct reset_controller_dev rst;  member
48 	container_of(_rst, struct syscfg_reset_controller, rst)
53 	struct syscfg_reset_controller *rst = to_syscfg_reset_controller(rcdev);  in syscfg_reset_program_hw()  local
55 	u32 ctrl_val = rst->active_low ? !assert : !!assert;  in syscfg_reset_program_hw()
58 	if (idx >= rcdev->nr_resets)  in syscfg_reset_program_hw()
59 		return -EINVAL;  in syscfg_reset_program_hw()
61 	ch = &rst->channels[idx];  in syscfg_reset_program_hw()
63 	err = regmap_field_write(ch->reset, ctrl_val);  in syscfg_reset_program_hw()
67 	if (ch->ack) {  in syscfg_reset_program_hw()
70 		err = regmap_field_read_poll_timeout(ch->ack, ack_val, (ack_val == ctrl_val),  in syscfg_reset_program_hw()
106 	struct syscfg_reset_controller *rst = to_syscfg_reset_controller(rcdev);  in syscfg_reset_status()  local
111 	if (idx >= rcdev->nr_resets)  in syscfg_reset_status()
112 		return -EINVAL;  in syscfg_reset_status()
114 	ch = &rst->channels[idx];  in syscfg_reset_status()
115 	if (ch->ack)  in syscfg_reset_status()
116 		err = regmap_field_read(ch->ack, &ret_val);  in syscfg_reset_status()
118 		err = regmap_field_read(ch->reset, &ret_val);  in syscfg_reset_status()
122 	return rst->active_low ? !ret_val : !!ret_val;  in syscfg_reset_status()
140 		return -ENOMEM;  in syscfg_reset_controller_register()
142 	rc->channels = devm_kcalloc(dev, data->nr_channels,  in syscfg_reset_controller_register()
143 				    sizeof(*rc->channels), GFP_KERNEL);  in syscfg_reset_controller_register()
144 	if (!rc->channels)  in syscfg_reset_controller_register()
145 		return -ENOMEM;  in syscfg_reset_controller_register()
147 	rc->rst.ops = &syscfg_reset_ops;  in syscfg_reset_controller_register()
148 	rc->rst.of_node = dev->of_node;  in syscfg_reset_controller_register()
149 	rc->rst.nr_resets = data->nr_channels;  in syscfg_reset_controller_register()
150 	rc->active_low = data->active_low;  in syscfg_reset_controller_register()
152 	for (i = 0; i < data->nr_channels; i++) {  in syscfg_reset_controller_register()
155 		const char *compatible = data->channels[i].compatible;  in syscfg_reset_controller_register()
161 		f = devm_regmap_field_alloc(dev, map, data->channels[i].reset);  in syscfg_reset_controller_register()
165 		rc->channels[i].reset = f;  in syscfg_reset_controller_register()
167 		if (!data->wait_for_ack)  in syscfg_reset_controller_register()
170 		f = devm_regmap_field_alloc(dev, map, data->channels[i].ack);  in syscfg_reset_controller_register()
174 		rc->channels[i].ack = f;  in syscfg_reset_controller_register()
177 	err = reset_controller_register(&rc->rst);  in syscfg_reset_controller_register()
186 	struct device *dev = pdev ? &pdev->dev : NULL;  in syscfg_reset_probe()
189 	if (!dev || !dev->driver)  in syscfg_reset_probe()
190 		return -ENODEV;  in syscfg_reset_probe()
192 	data = device_get_match_data(&pdev->dev);  in syscfg_reset_probe()
194 		return -EINVAL;  in syscfg_reset_probe()