1 // SPDX-License-Identifier: GPL-2.0-only
25 #include "cpufreq-dt.h"
41 	NULL,   /* Extra space for boost-attr if required */
50 		if (cpumask_test_cpu(cpu, priv->cpus))  in cpufreq_dt_find_data()
59 	struct private_data *priv = policy->driver_data;  in set_target()
60 	unsigned long freq = policy->freq_table[index].frequency;  in set_target()
62 	return dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);  in set_target()
66  * An earlier version of opp-v1 bindings used to name the regulator
67  * "cpu0-supply", we still need to handle that for backwards compatibility.
73 	int cpu = dev->id;  in find_supply_name()
76 	np = of_node_get(dev->of_node);  in find_supply_name()
84 		pp = of_find_property(np, "cpu0-supply", NULL);  in find_supply_name()
91 	pp = of_find_property(np, "cpu-supply", NULL);  in find_supply_name()
112 	priv = cpufreq_dt_find_data(policy->cpu);  in cpufreq_init()
114 		pr_err("failed to find data for cpu%d\n", policy->cpu);  in cpufreq_init()
115 		return -ENODEV;  in cpufreq_init()
118 	cpu_dev = priv->cpu_dev;  in cpufreq_init()
119 	cpumask_copy(policy->cpus, priv->cpus);  in cpufreq_init()
129 	 * Initialize OPP tables for all policy->cpus. They will be shared by  in cpufreq_init()
130 	 * all CPUs which have marked their CPUs shared with OPP bindings.  in cpufreq_init()
132 	 * For platforms not using operating-points-v2 bindings, we do this  in cpufreq_init()
133 	 * before updating policy->cpus. Otherwise, we will end up creating  in cpufreq_init()
134 	 * duplicate OPPs for policy->cpus.  in cpufreq_init()
138 	if (!dev_pm_opp_of_cpumask_add_table(policy->cpus))  in cpufreq_init()
139 		priv->have_static_opps = true;  in cpufreq_init()
142 	 * But we need OPP table to function so if it is not there let's  in cpufreq_init()
147 		dev_err(cpu_dev, "OPP table can't be empty\n");  in cpufreq_init()
148 		ret = -ENODEV;  in cpufreq_init()
154 		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);  in cpufreq_init()
158 	policy->driver_data = priv;  in cpufreq_init()
159 	policy->clk = cpu_clk;  in cpufreq_init()
160 	policy->freq_table = freq_table;  in cpufreq_init()
162 	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;  in cpufreq_init()
177 	policy->cpuinfo.transition_latency = transition_latency;  in cpufreq_init()
178 	policy->dvfs_possible_from_any_cpu = true;  in cpufreq_init()
180 	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);  in cpufreq_init()
187 	if (priv->have_static_opps)  in cpufreq_init()
188 		dev_pm_opp_of_cpumask_remove_table(policy->cpus);  in cpufreq_init()
196 	/* We did light-weight tear down earlier, nothing to do here */  in cpufreq_online()
203 	 * Preserve policy->driver_data and don't free resources on light-weight  in cpufreq_offline()
211 	struct private_data *priv = policy->driver_data;  in cpufreq_exit()
213 	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);  in cpufreq_exit()
214 	if (priv->have_static_opps)  in cpufreq_exit()
215 		dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);  in cpufreq_exit()
216 	clk_put(policy->clk);  in cpufreq_exit()
230 	.name = "cpufreq-dt",
248 		return -EPROBE_DEFER;  in dt_cpufreq_early_init()
252 		return -ENOMEM;  in dt_cpufreq_early_init()
254 	if (!alloc_cpumask_var(&priv->cpus, GFP_KERNEL))  in dt_cpufreq_early_init()
255 		return -ENOMEM;  in dt_cpufreq_early_init()
257 	priv->cpu_dev = cpu_dev;  in dt_cpufreq_early_init()
259 	/* Try to get OPP table early to ensure resources are available */  in dt_cpufreq_early_init()
260 	priv->opp_table = dev_pm_opp_get_opp_table(cpu_dev);  in dt_cpufreq_early_init()
261 	if (IS_ERR(priv->opp_table)) {  in dt_cpufreq_early_init()
262 		ret = PTR_ERR(priv->opp_table);  in dt_cpufreq_early_init()
263 		if (ret != -EPROBE_DEFER)  in dt_cpufreq_early_init()
264 			dev_err(cpu_dev, "failed to get OPP table: %d\n", ret);  in dt_cpufreq_early_init()
269 	 * OPP layer will be taking care of regulators now, but it needs to know  in dt_cpufreq_early_init()
274 		priv->reg_opp_table = dev_pm_opp_set_regulators(cpu_dev,  in dt_cpufreq_early_init()
276 		if (IS_ERR(priv->reg_opp_table)) {  in dt_cpufreq_early_init()
277 			ret = PTR_ERR(priv->reg_opp_table);  in dt_cpufreq_early_init()
278 			if (ret != -EPROBE_DEFER)  in dt_cpufreq_early_init()
285 	/* Find OPP sharing information so we can fill pri->cpus here */  in dt_cpufreq_early_init()
286 	/* Get OPP-sharing information from "operating-points-v2" bindings */  in dt_cpufreq_early_init()
287 	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->cpus);  in dt_cpufreq_early_init()
289 		if (ret != -ENOENT)  in dt_cpufreq_early_init()
293 		 * operating-points-v2 not supported, fallback to all CPUs share  in dt_cpufreq_early_init()
294 		 * OPP for backward compatibility if the platform hasn't set  in dt_cpufreq_early_init()
297 		if (dev_pm_opp_get_sharing_cpus(cpu_dev, priv->cpus)) {  in dt_cpufreq_early_init()
298 			cpumask_setall(priv->cpus);  in dt_cpufreq_early_init()
301 			 * OPP tables are initialized only for cpu, do it for  in dt_cpufreq_early_init()
304 			ret = dev_pm_opp_set_sharing_cpus(cpu_dev, priv->cpus);  in dt_cpufreq_early_init()
311 	list_add(&priv->node, &priv_list);  in dt_cpufreq_early_init()
315 	if (priv->reg_opp_table)  in dt_cpufreq_early_init()
316 		dev_pm_opp_put_regulators(priv->reg_opp_table);  in dt_cpufreq_early_init()
318 	dev_pm_opp_put_opp_table(priv->opp_table);  in dt_cpufreq_early_init()
320 	free_cpumask_var(priv->cpus);  in dt_cpufreq_early_init()
329 		if (priv->reg_opp_table)  in dt_cpufreq_release()
330 			dev_pm_opp_put_regulators(priv->reg_opp_table);  in dt_cpufreq_release()
331 		dev_pm_opp_put_opp_table(priv->opp_table);  in dt_cpufreq_release()
332 		free_cpumask_var(priv->cpus);  in dt_cpufreq_release()
333 		list_del(&priv->node);  in dt_cpufreq_release()
339 	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);  in dt_cpufreq_probe()
342 	/* Request resources early so we can return in case of -EPROBE_DEFER */  in dt_cpufreq_probe()
344 		ret = dt_cpufreq_early_init(&pdev->dev, cpu);  in dt_cpufreq_probe()
350 		if (data->have_governor_per_policy)  in dt_cpufreq_probe()
353 		dt_cpufreq_driver.resume = data->resume;  in dt_cpufreq_probe()
354 		if (data->suspend)  in dt_cpufreq_probe()
355 			dt_cpufreq_driver.suspend = data->suspend;  in dt_cpufreq_probe()
356 		if (data->get_intermediate) {  in dt_cpufreq_probe()
357 			dt_cpufreq_driver.target_intermediate = data->target_intermediate;  in dt_cpufreq_probe()
358 			dt_cpufreq_driver.get_intermediate = data->get_intermediate;  in dt_cpufreq_probe()
364 		dev_err(&pdev->dev, "failed register driver: %d\n", ret);  in dt_cpufreq_probe()
383 		.name	= "cpufreq-dt",
390 MODULE_ALIAS("platform:cpufreq-dt");