1 // SPDX-License-Identifier: GPL-2.0-or-later
11 #include <linux/clk.h>
20 #include <linux/platform_data/syscon.h>
23 #include <linux/mfd/syscon.h>
31 struct syscon {  struct
43 static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)  in of_syscon_register()  argument
45 	struct clk *clk;  in of_syscon_register()  local
46 	struct syscon *syscon;  in of_syscon_register()  local
54 	syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);  in of_syscon_register()
55 	if (!syscon)  in of_syscon_register()
56 		return ERR_PTR(-ENOMEM);  in of_syscon_register()
59 		ret = -ENOMEM;  in of_syscon_register()
65 		ret = -ENOMEM;  in of_syscon_register()
70 	if (of_property_read_bool(np, "big-endian"))  in of_syscon_register()
72 	else if (of_property_read_bool(np, "little-endian"))  in of_syscon_register()
74 	else if (of_property_read_bool(np, "native-endian"))  in of_syscon_register()
78 	 * search for reg-io-width property in DT. If it is not provided,  in of_syscon_register()
82 	ret = of_property_read_u32(np, "reg-io-width", &reg_io_width);  in of_syscon_register()
93 		case -ENOENT:  in of_syscon_register()
99 		case -EPROBE_DEFER:  in of_syscon_register()
108 	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()
132 	syscon->regmap = regmap;  in of_syscon_register()
133 	syscon->np = np;  in of_syscon_register()
136 	list_add_tail(&syscon->list, &syscon_list);  in of_syscon_register()
139 	return syscon;  in of_syscon_register()
142 	if (!IS_ERR(clk))  in of_syscon_register()
143 		clk_put(clk);  in of_syscon_register()
149 	kfree(syscon);  in of_syscon_register()
156 	struct syscon *entry, *syscon = NULL;  in device_node_get_regmap()  local
161 		if (entry->np == np) {  in device_node_get_regmap()
162 			syscon = entry;  in device_node_get_regmap()
168 	if (!syscon)  in device_node_get_regmap()
169 		syscon = of_syscon_register(np, check_clk);  in device_node_get_regmap()
171 	if (IS_ERR(syscon))  in device_node_get_regmap()
172 		return ERR_CAST(syscon);  in device_node_get_regmap()
174 	return syscon->regmap;  in device_node_get_regmap()
185 	if (!of_device_is_compatible(np, "syscon"))  in syscon_node_to_regmap()
186 		return ERR_PTR(-EINVAL);  in syscon_node_to_regmap()
199 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_compatible()
220 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_phandle()
247 		return ERR_PTR(-ENODEV);  in syscon_regmap_lookup_by_phandle_args()
260  * there is no regmap phandle. In this case, instead of returning -ENODEV,
269 	if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)  in syscon_regmap_lookup_by_phandle_optional()
278 	struct device *dev = &pdev->dev;  in syscon_probe()
280 	struct syscon *syscon;  in syscon_probe()  local
285 	syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);  in syscon_probe()
286 	if (!syscon)  in syscon_probe()
287 		return -ENOMEM;  in syscon_probe()
291 		return -ENOENT;  in syscon_probe()
293 	base = devm_ioremap(dev, res->start, resource_size(res));  in syscon_probe()
295 		return -ENOMEM;  in syscon_probe()
297 	syscon_config.max_register = resource_size(res) - 4;  in syscon_probe()
299 		syscon_config.name = pdata->label;  in syscon_probe()
300 	syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);  in syscon_probe()
301 	if (IS_ERR(syscon->regmap)) {  in syscon_probe()
303 		return PTR_ERR(syscon->regmap);  in syscon_probe()
306 	platform_set_drvdata(pdev, syscon);  in syscon_probe()
314 	{ "syscon", },
320 		.name = "syscon",