1 // SPDX-License-Identifier: GPL-2.0-or-later
16 #include <linux/init.h>
24 #include <linux/reset.h>
36 	struct reset_control *reset;  member
55 	struct reset_control *reset;  in of_syscon_register()  local
59 		return ERR_PTR(-ENOMEM);  in of_syscon_register()
62 		return ERR_PTR(-ENOMEM);  in of_syscon_register()
66 		return ERR_PTR(-ENOMEM);  in of_syscon_register()
69 	if (of_property_read_bool(np, "big-endian"))  in of_syscon_register()
71 	else if (of_property_read_bool(np, "little-endian"))  in of_syscon_register()
73 	else if (of_property_read_bool(np, "native-endian"))  in of_syscon_register()
77 	 * search for reg-io-width property in DT. If it is not provided,  in of_syscon_register()
79 	 * are invalid so there is no need to check them here.  in of_syscon_register()
81 	ret = of_property_read_u32(np, "reg-io-width", &reg_io_width);  in of_syscon_register()
92 		case -ENOENT:  in of_syscon_register()
98 		case -EPROBE_DEFER:  in of_syscon_register()
105 		ret = -ENOMEM;  in of_syscon_register()
110 	syscon_config.max_register = resource_size(&res) - reg_io_width;  in of_syscon_register()
115 		pr_err("regmap init failed\n");  in of_syscon_register()
125 			if (ret != -ENOENT)  in of_syscon_register()
133 		reset = of_reset_control_get_optional_exclusive(np, NULL);  in of_syscon_register()
134 		if (IS_ERR(reset)) {  in of_syscon_register()
135 			ret = PTR_ERR(reset);  in of_syscon_register()
139 		ret = reset_control_deassert(reset);  in of_syscon_register()
144 	syscon->regmap = regmap;  in of_syscon_register()
145 	syscon->np = np;  in of_syscon_register()
148 	list_add_tail(&syscon->list, &syscon_list);  in of_syscon_register()
154 	reset_control_put(reset);  in of_syscon_register()
173 		if (entry->np == np) {  in device_node_get_regmap()
186 	return syscon->regmap;  in device_node_get_regmap()
190  * of_syscon_register_regmap() - Register regmap for specified device node
198  * Return: 0 on success, negative error code on failure.
206 		return -EINVAL;  in of_syscon_register_regmap()
210 		return -ENOMEM;  in of_syscon_register_regmap()
216 		if (entry->np == np) {  in of_syscon_register_regmap()
217 			ret = -EEXIST;  in of_syscon_register_regmap()
221 	syscon->regmap = regmap;  in of_syscon_register_regmap()
222 	syscon->np = np;  in of_syscon_register_regmap()
225 	list_add_tail(&syscon->list, &syscon_list);  in of_syscon_register_regmap()
246 		return ERR_PTR(-EINVAL);  in syscon_node_to_regmap()
259 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_compatible()
280 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_phandle()
309 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_phandle_args()
322  * there is no regmap phandle. In this case, instead of returning -ENODEV,
331 	if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)  in syscon_regmap_lookup_by_phandle_optional()
340 	struct device *dev = &pdev->dev;  in syscon_probe()
349 		return -ENOMEM;  in syscon_probe()
353 		return -ENOENT;  in syscon_probe()
355 	base = devm_ioremap(dev, res->start, resource_size(res));  in syscon_probe()
357 		return -ENOMEM;  in syscon_probe()
359 	syscon_config.max_register = resource_size(res) - 4;  in syscon_probe()
361 		syscon_config.name = pdata->label;  in syscon_probe()
362 	syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);  in syscon_probe()
363 	if (IS_ERR(syscon->regmap)) {  in syscon_probe()
364 		dev_err(dev, "regmap init failed\n");  in syscon_probe()
365 		return PTR_ERR(syscon->regmap);  in syscon_probe()