1 // SPDX-License-Identifier: GPL-2.0-or-later
12 #include <linux/clk.h>
21 #include <linux/mfd/syscon.h>
27 struct syscon {  struct
40 static struct syscon *of_syscon_register(struct device_node *np, bool check_res)  in of_syscon_register()  argument
42 	struct clk *clk;  in of_syscon_register()  local
53 	struct syscon *syscon __free(kfree) = kzalloc(sizeof(*syscon), GFP_KERNEL);  in of_syscon_register()
54 	if (!syscon)  in of_syscon_register()
55 		return ERR_PTR(-ENOMEM);  in of_syscon_register()
58 		return ERR_PTR(-ENOMEM);  in of_syscon_register()
62 		return ERR_PTR(-ENOMEM);  in of_syscon_register()
65 	if (of_property_read_bool(np, "big-endian"))  in of_syscon_register()
67 	else if (of_property_read_bool(np, "little-endian"))  in of_syscon_register()
69 	else if (of_property_read_bool(np, "native-endian"))  in of_syscon_register()
73 	 * search for reg-io-width property in DT. If it is not provided,  in of_syscon_register()
77 	ret = of_property_read_u32(np, "reg-io-width", &reg_io_width);  in of_syscon_register()
88 		case -ENOENT:  in of_syscon_register()
94 		case -EPROBE_DEFER:  in of_syscon_register()
101 		ret = -ENOMEM;  in of_syscon_register()
106 	syscon_config.max_register = resource_size(&res) - reg_io_width;  in of_syscon_register()
119 		clk = of_clk_get(np, 0);  in of_syscon_register()
120 		if (IS_ERR(clk)) {  in of_syscon_register()
121 			ret = PTR_ERR(clk);  in of_syscon_register()
123 			if (ret != -ENOENT)  in of_syscon_register()
126 			ret = regmap_mmio_attach_clk(regmap, clk);  in of_syscon_register()
142 	syscon->regmap = regmap;  in of_syscon_register()
143 	syscon->np = np;  in of_syscon_register()
145 	list_add_tail(&syscon->list, &syscon_list);  in of_syscon_register()
147 	return_ptr(syscon);  in of_syscon_register()
152 	if (!IS_ERR(clk))  in of_syscon_register()
153 		clk_put(clk);  in of_syscon_register()
165 	struct syscon *entry, *syscon = NULL;  in device_node_get_regmap()  local
170 		if (entry->np == np) {  in device_node_get_regmap()
171 			syscon = entry;  in device_node_get_regmap()
175 	if (!syscon) {  in device_node_get_regmap()
177 			syscon = of_syscon_register(np, check_res);  in device_node_get_regmap()
179 			syscon = ERR_PTR(-EINVAL);  in device_node_get_regmap()
183 	if (IS_ERR(syscon))  in device_node_get_regmap()
184 		return ERR_CAST(syscon);  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
194  * Register an externally created regmap object with syscon for the specified
202 	struct syscon *entry, *syscon = NULL;  in of_syscon_register_regmap()  local
206 		return -EINVAL;  in of_syscon_register_regmap()
208 	syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);  in of_syscon_register_regmap()
209 	if (!syscon)  in of_syscon_register_regmap()
210 		return -ENOMEM;  in of_syscon_register_regmap()
212 	/* check if syscon entry already exists */  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()
224 	/* register the regmap in syscon list */  in of_syscon_register_regmap()
225 	list_add_tail(&syscon->list, &syscon_list);  in of_syscon_register_regmap()
232 	kfree(syscon);  in of_syscon_register_regmap()
238  * device_node_to_regmap() - Get or create a regmap for specified device node
255  * syscon_node_to_regmap() - Get or create a regmap for specified syscon device node
259  * regmap, then one is instantiated if the node is a generic "syscon". This
260  * function is safe to use for a syscon registered with
267 	return device_node_get_regmap(np, of_device_is_compatible(np, "syscon"), true);  in syscon_node_to_regmap()
278 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_compatible()
299 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_phandle()
328 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_phandle_args()
341  * there is no regmap phandle. In this case, instead of returning -ENODEV,
350 	if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)  in syscon_regmap_lookup_by_phandle_optional()