1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * fixed.c
10  * Roger Quadros <ext-roger.quadros@nokia.com>
13  * non-controllable regulators, as well as for allowing testing on
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/fixed.h>
28 #include <linux/regulator/of_regulator.h>
29 #include <linux/regulator/machine.h>
52 	ret = clk_prepare_enable(priv->enable_clock);  in reg_clock_enable()
56 	priv->enable_counter++;  in reg_clock_enable()
65 	clk_disable_unprepare(priv->enable_clock);  in reg_clock_disable()
66 	priv->enable_counter--;  in reg_clock_disable()
74 	struct device *dev = rdev->dev.parent;  in reg_domain_enable()
77 	ret = dev_pm_genpd_set_performance_state(dev, priv->performance_state);  in reg_domain_enable()
81 	priv->enable_counter++;  in reg_domain_enable()
89 	struct device *dev = rdev->dev.parent;  in reg_domain_disable()
96 	priv->enable_counter--;  in reg_domain_disable()
105 	return priv->enable_counter > 0;  in reg_is_enabled()
110  * of_get_fixed_voltage_config - extract fixed_voltage_config structure info
112  * @desc: regulator description
123 	struct device_node *np = dev->of_node;  in of_get_fixed_voltage_config()
129 		return ERR_PTR(-ENOMEM);  in of_get_fixed_voltage_config()
131 	config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc);  in of_get_fixed_voltage_config()
132 	if (!config->init_data)  in of_get_fixed_voltage_config()
133 		return ERR_PTR(-EINVAL);  in of_get_fixed_voltage_config()
135 	init_data = config->init_data;  in of_get_fixed_voltage_config()
136 	init_data->constraints.apply_uV = 0;  in of_get_fixed_voltage_config()
138 	config->supply_name = init_data->constraints.name;  in of_get_fixed_voltage_config()
139 	if (init_data->constraints.min_uV == init_data->constraints.max_uV) {  in of_get_fixed_voltage_config()
140 		config->microvolts = init_data->constraints.min_uV;  in of_get_fixed_voltage_config()
143 			 "Fixed regulator specified with variable voltages\n");  in of_get_fixed_voltage_config()
144 		return ERR_PTR(-EINVAL);  in of_get_fixed_voltage_config()
147 	if (init_data->constraints.boot_on)  in of_get_fixed_voltage_config()
148 		config->enabled_at_boot = true;  in of_get_fixed_voltage_config()
150 	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);  in of_get_fixed_voltage_config()
151 	of_property_read_u32(np, "off-on-delay-us", &config->off_on_delay);  in of_get_fixed_voltage_config()
153 	if (of_property_present(np, "vin-supply"))  in of_get_fixed_voltage_config()
154 		config->input_supply = "vin";  in of_get_fixed_voltage_config()
176 	struct device *dev = &pdev->dev;  in reg_fixed_voltage_probe()
184 	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data),  in reg_fixed_voltage_probe()
187 		return -ENOMEM;  in reg_fixed_voltage_probe()
189 	if (pdev->dev.of_node) {  in reg_fixed_voltage_probe()
190 		config = of_get_fixed_voltage_config(&pdev->dev,  in reg_fixed_voltage_probe()
191 						     &drvdata->desc);  in reg_fixed_voltage_probe()
195 		config = dev_get_platdata(&pdev->dev);  in reg_fixed_voltage_probe()
199 		return -ENOMEM;  in reg_fixed_voltage_probe()
201 	drvdata->desc.name = devm_kstrdup(&pdev->dev,  in reg_fixed_voltage_probe()
202 					  config->supply_name,  in reg_fixed_voltage_probe()
204 	if (drvdata->desc.name == NULL) {  in reg_fixed_voltage_probe()
205 		dev_err(&pdev->dev, "Failed to allocate supply name\n");  in reg_fixed_voltage_probe()
206 		return -ENOMEM;  in reg_fixed_voltage_probe()
208 	drvdata->desc.type = REGULATOR_VOLTAGE;  in reg_fixed_voltage_probe()
209 	drvdata->desc.owner = THIS_MODULE;  in reg_fixed_voltage_probe()
211 	if (drvtype && drvtype->has_enable_clock) {  in reg_fixed_voltage_probe()
212 		drvdata->desc.ops = &fixed_voltage_clkenabled_ops;  in reg_fixed_voltage_probe()
214 		drvdata->enable_clock = devm_clk_get(dev, NULL);  in reg_fixed_voltage_probe()
215 		if (IS_ERR(drvdata->enable_clock)) {  in reg_fixed_voltage_probe()
216 			dev_err(dev, "Can't get enable-clock from devicetree\n");  in reg_fixed_voltage_probe()
217 			return PTR_ERR(drvdata->enable_clock);  in reg_fixed_voltage_probe()
219 	} else if (drvtype && drvtype->has_performance_state) {  in reg_fixed_voltage_probe()
220 		drvdata->desc.ops = &fixed_voltage_domain_ops;  in reg_fixed_voltage_probe()
222 		drvdata->performance_state = of_get_required_opp_performance_state(dev->of_node, 0);  in reg_fixed_voltage_probe()
223 		if (drvdata->performance_state < 0) {  in reg_fixed_voltage_probe()
225 			return drvdata->performance_state;  in reg_fixed_voltage_probe()
228 		drvdata->desc.ops = &fixed_voltage_ops;  in reg_fixed_voltage_probe()
231 	drvdata->desc.enable_time = config->startup_delay;  in reg_fixed_voltage_probe()
232 	drvdata->desc.off_on_delay = config->off_on_delay;  in reg_fixed_voltage_probe()
234 	if (config->input_supply) {  in reg_fixed_voltage_probe()
235 		drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,  in reg_fixed_voltage_probe()
236 					    config->input_supply,  in reg_fixed_voltage_probe()
238 		if (!drvdata->desc.supply_name)  in reg_fixed_voltage_probe()
239 			return -ENOMEM;  in reg_fixed_voltage_probe()
242 	if (config->microvolts)  in reg_fixed_voltage_probe()
243 		drvdata->desc.n_voltages = 1;  in reg_fixed_voltage_probe()
245 	drvdata->desc.fixed_uV = config->microvolts;  in reg_fixed_voltage_probe()
251 	if (config->enabled_at_boot)  in reg_fixed_voltage_probe()
257 	 * Some fixed regulators share the enable line between two  in reg_fixed_voltage_probe()
270 	 * Do not use devm* here: the regulator core takes over the  in reg_fixed_voltage_probe()
273 	cfg.ena_gpiod = gpiod_get_optional(&pdev->dev, NULL, gflags);  in reg_fixed_voltage_probe()
275 		return dev_err_probe(&pdev->dev, PTR_ERR(cfg.ena_gpiod),  in reg_fixed_voltage_probe()
278 	cfg.dev = &pdev->dev;  in reg_fixed_voltage_probe()
279 	cfg.init_data = config->init_data;  in reg_fixed_voltage_probe()
281 	cfg.of_node = pdev->dev.of_node;  in reg_fixed_voltage_probe()
283 	drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc,  in reg_fixed_voltage_probe()
285 	if (IS_ERR(drvdata->dev)) {  in reg_fixed_voltage_probe()
286 		ret = dev_err_probe(&pdev->dev, PTR_ERR(drvdata->dev),  in reg_fixed_voltage_probe()
287 				    "Failed to register regulator: %ld\n",  in reg_fixed_voltage_probe()
288 				    PTR_ERR(drvdata->dev));  in reg_fixed_voltage_probe()
294 	dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,  in reg_fixed_voltage_probe()
295 		drvdata->desc.fixed_uV);  in reg_fixed_voltage_probe()
315 		.compatible = "regulator-fixed",
319 		.compatible = "regulator-fixed-clock",
323 		.compatible = "regulator-fixed-domain",
335 		.name		= "reg-fixed-voltage",
354 MODULE_DESCRIPTION("Fixed voltage regulator");
356 MODULE_ALIAS("platform:reg-fixed-voltage");