[mirror_ubuntu-jammy-kernel.git] / drivers / cpufreq / cpufreq-dt.c

/*
 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 *
 * Copyright (C) 2014 Linaro.
 * Viresh Kumar <viresh.kumar@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpu_cooling.h>
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_opp.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/thermal.h>

#include "cpufreq-dt.h"

struct private_data {
	struct opp_table *opp_table;
	struct device *cpu_dev;
	struct thermal_cooling_device *cdev;
	const char *reg_name;
};

static struct freq_attr *cpufreq_dt_attr[] = {
	&cpufreq_freq_attr_scaling_available_freqs,
	NULL,   /* Extra space for boost-attr if required */
	NULL,
};

static int set_target(struct cpufreq_policy *policy, unsigned int index)
{
	struct private_data *priv = policy->driver_data;
	unsigned long freq = policy->freq_table[index].frequency;
	int ret;

	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);

	if (!ret) {
		arch_set_freq_scale(policy->related_cpus, freq,
				    policy->cpuinfo.max_freq);
	}

	return ret;
}

/*
 * An earlier version of opp-v1 bindings used to name the regulator
 * "cpu0-supply", we still need to handle that for backwards compatibility.
 */
static const char *find_supply_name(struct device *dev)
{
	struct device_node *np;
	struct property *pp;
	int cpu = dev->id;
	const char *name = NULL;

	np = of_node_get(dev->of_node);

	/* This must be valid for sure */
	if (WARN_ON(!np))
		return NULL;

	/* Try "cpu0" for older DTs */
	if (!cpu) {
		pp = of_find_property(np, "cpu0-supply", NULL);
		if (pp) {
			name = "cpu0";
			goto node_put;
		}
	}

	pp = of_find_property(np, "cpu-supply", NULL);
	if (pp) {
		name = "cpu";
		goto node_put;
	}

	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
node_put:
	of_node_put(np);
	return name;
}

static int resources_available(void)
{
	struct device *cpu_dev;
	struct regulator *cpu_reg;
	struct clk *cpu_clk;
	int ret = 0;
	const char *name;

	cpu_dev = get_cpu_device(0);
	if (!cpu_dev) {
		pr_err("failed to get cpu0 device\n");
		return -ENODEV;
	}

	cpu_clk = clk_get(cpu_dev, NULL);
	ret = PTR_ERR_OR_ZERO(cpu_clk);
	if (ret) {
		/*
		 * If cpu's clk node is present, but clock is not yet
		 * registered, we should try defering probe.
		 */
		if (ret == -EPROBE_DEFER)
			dev_dbg(cpu_dev, "clock not ready, retry\n");
		else
			dev_err(cpu_dev, "failed to get clock: %d\n", ret);

		return ret;
	}

	clk_put(cpu_clk);

	name = find_supply_name(cpu_dev);
	/* Platform doesn't require regulator */
	if (!name)
		return 0;

	cpu_reg = regulator_get_optional(cpu_dev, name);
	ret = PTR_ERR_OR_ZERO(cpu_reg);
	if (ret) {
		/*
		 * If cpu's regulator supply node is present, but regulator is
		 * not yet registered, we should try defering probe.
		 */
		if (ret == -EPROBE_DEFER)
			dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
		else
			dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);

		return ret;
	}

	regulator_put(cpu_reg);
	return 0;
}

static int cpufreq_init(struct cpufreq_policy *policy)
{
	struct cpufreq_frequency_table *freq_table;
	struct opp_table *opp_table = NULL;
	struct private_data *priv;
	struct device *cpu_dev;
	struct clk *cpu_clk;
	unsigned int transition_latency;
	bool fallback = false;
	const char *name;
	int ret;

	cpu_dev = get_cpu_device(policy->cpu);
	if (!cpu_dev) {
		pr_err("failed to get cpu%d device\n", policy->cpu);
		return -ENODEV;
	}

	cpu_clk = clk_get(cpu_dev, NULL);
	if (IS_ERR(cpu_clk)) {
		ret = PTR_ERR(cpu_clk);
		dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
		return ret;
	}

	/* Get OPP-sharing information from "operating-points-v2" bindings */
	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
	if (ret) {
		if (ret != -ENOENT)
			goto out_put_clk;

		/*
		 * operating-points-v2 not supported, fallback to old method of
		 * finding shared-OPPs for backward compatibility if the
		 * platform hasn't set sharing CPUs.
		 */
		if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
			fallback = true;
	}

	/*
	 * OPP layer will be taking care of regulators now, but it needs to know
	 * the name of the regulator first.
	 */
	name = find_supply_name(cpu_dev);
	if (name) {
		opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
		if (IS_ERR(opp_table)) {
			ret = PTR_ERR(opp_table);
			dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
				policy->cpu, ret);
			goto out_put_clk;
		}
	}

	/*
	 * Initialize OPP tables for all policy->cpus. They will be shared by
	 * all CPUs which have marked their CPUs shared with OPP bindings.
	 *
	 * For platforms not using operating-points-v2 bindings, we do this
	 * before updating policy->cpus. Otherwise, we will end up creating
	 * duplicate OPPs for policy->cpus.
	 *
	 * OPPs might be populated at runtime, don't check for error here
	 */
	dev_pm_opp_of_cpumask_add_table(policy->cpus);

	/*
	 * But we need OPP table to function so if it is not there let's
	 * give platform code chance to provide it for us.
	 */
	ret = dev_pm_opp_get_opp_count(cpu_dev);
	if (ret <= 0) {
		dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
		ret = -EPROBE_DEFER;
		goto out_free_opp;
	}

	if (fallback) {
		cpumask_setall(policy->cpus);

		/*
		 * OPP tables are initialized only for policy->cpu, do it for
		 * others as well.
		 */
		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
		if (ret)
			dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
				__func__, ret);
	}

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		ret = -ENOMEM;
		goto out_free_opp;
	}

	priv->reg_name = name;
	priv->opp_table = opp_table;

	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
	if (ret) {
		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
		goto out_free_priv;
	}

	priv->cpu_dev = cpu_dev;
	policy->driver_data = priv;
	policy->clk = cpu_clk;

	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;

	ret = cpufreq_table_validate_and_show(policy, freq_table);
	if (ret) {
		dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
			ret);
		goto out_free_cpufreq_table;
	}

	/* Support turbo/boost mode */
	if (policy_has_boost_freq(policy)) {
		/* This gets disabled by core on driver unregister */
		ret = cpufreq_enable_boost_support();
		if (ret)
			goto out_free_cpufreq_table;
		cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
	}

	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	if (!transition_latency)
		transition_latency = CPUFREQ_ETERNAL;

	policy->cpuinfo.transition_latency = transition_latency;
	policy->dvfs_possible_from_any_cpu = true;

	return 0;

out_free_cpufreq_table:
	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
out_free_priv:
	kfree(priv);
out_free_opp:
	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
	if (name)
		dev_pm_opp_put_regulators(opp_table);
out_put_clk:
	clk_put(cpu_clk);

	return ret;
}

static int cpufreq_exit(struct cpufreq_policy *policy)
{
	struct private_data *priv = policy->driver_data;

	cpufreq_cooling_unregister(priv->cdev);
	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
	if (priv->reg_name)
		dev_pm_opp_put_regulators(priv->opp_table);

	clk_put(policy->clk);
	kfree(priv);

	return 0;
}

static void cpufreq_ready(struct cpufreq_policy *policy)
{
	struct private_data *priv = policy->driver_data;

	priv->cdev = of_cpufreq_cooling_register(policy);
}

static struct cpufreq_driver dt_cpufreq_driver = {
	.flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
	.verify = cpufreq_generic_frequency_table_verify,
	.target_index = set_target,
	.get = cpufreq_generic_get,
	.init = cpufreq_init,
	.exit = cpufreq_exit,
	.ready = cpufreq_ready,
	.name = "cpufreq-dt",
	.attr = cpufreq_dt_attr,
	.suspend = cpufreq_generic_suspend,
};

static int dt_cpufreq_probe(struct platform_device *pdev)
{
	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
	int ret;

	/*
	 * All per-cluster (CPUs sharing clock/voltages) initialization is done
	 * from ->init(). In probe(), we just need to make sure that clk and
	 * regulators are available. Else defer probe and retry.
	 *
	 * FIXME: Is checking this only for CPU0 sufficient ?
	 */
	ret = resources_available();
	if (ret)
		return ret;

	if (data && data->have_governor_per_policy)
		dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;

	ret = cpufreq_register_driver(&dt_cpufreq_driver);
	if (ret)
		dev_err(&pdev->dev, "failed register driver: %d\n", ret);

	return ret;
}

static int dt_cpufreq_remove(struct platform_device *pdev)
{
	cpufreq_unregister_driver(&dt_cpufreq_driver);
	return 0;
}

static struct platform_driver dt_cpufreq_platdrv = {
	.driver = {
		.name	= "cpufreq-dt",
	},
	.probe		= dt_cpufreq_probe,
	.remove		= dt_cpufreq_remove,
};
module_platform_driver(dt_cpufreq_platdrv);

MODULE_ALIAS("platform:cpufreq-dt");
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
MODULE_DESCRIPTION("Generic cpufreq driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
95ceafd4 SG	1	/*
	2	* Copyright (C) 2012 Freescale Semiconductor, Inc.
	3	*
748c8766 VK	4	* Copyright (C) 2014 Linaro.
	5	* Viresh Kumar <viresh.kumar@linaro.org>
	6	*
95ceafd4 SG	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	13
	14	#include <linux/clk.h>
e1825b25	15	#include <linux/cpu.h>
77cff592	16	#include <linux/cpu_cooling.h>
95ceafd4	17	#include <linux/cpufreq.h>
77cff592	18	#include <linux/cpumask.h>
95ceafd4 SG	19	#include <linux/err.h>
	20	#include <linux/module.h>
	21	#include <linux/of.h>
e4db1c74	22	#include <linux/pm_opp.h>
5553f9e2	23	#include <linux/platform_device.h>
95ceafd4 SG	24	#include <linux/regulator/consumer.h>
95ceafd4 SG	25	#include <linux/slab.h>
77cff592	26	#include <linux/thermal.h>
95ceafd4	27
297a6622 VK	28	#include "cpufreq-dt.h"
297a6622 VK	29
d2f31f1d	30	struct private_data {
91291d9a	31	struct opp_table *opp_table;
d2f31f1d	32	struct device *cpu_dev;
d2f31f1d	33	struct thermal_cooling_device *cdev;
050794aa	34	const char *reg_name;
d2f31f1d	35	};
95ceafd4	36
21c36d35 BZ	37	static struct freq_attr *cpufreq_dt_attr[] = {
	38	&cpufreq_freq_attr_scaling_available_freqs,
	39	NULL, /* Extra space for boost-attr if required */
	40	NULL,
	41	};
	42
bbcf0719	43	static int set_target(struct cpufreq_policy *policy, unsigned int index)
95ceafd4	44	{
d2f31f1d	45	struct private_data *priv = policy->driver_data;
400ec74d DE	46	unsigned long freq = policy->freq_table[index].frequency;
400ec74d DE	47	int ret;
95ceafd4	48
400ec74d DE	49	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
	50
	51	if (!ret) {
	52	arch_set_freq_scale(policy->related_cpus, freq,
	53	policy->cpuinfo.max_freq);
	54	}
	55
	56	return ret;
95ceafd4 SG	57	}
95ceafd4 SG	58
050794aa VK	59	/*
	60	* An earlier version of opp-v1 bindings used to name the regulator
	61	* "cpu0-supply", we still need to handle that for backwards compatibility.
	62	*/
df2c8ec2	63	static const char find_supply_name(struct device dev)
050794aa	64	{
df2c8ec2	65	struct device_node *np;
050794aa VK	66	struct property *pp;
050794aa VK	67	int cpu = dev->id;
df2c8ec2 VK	68	const char *name = NULL;
	69
	70	np = of_node_get(dev->of_node);
	71
	72	/* This must be valid for sure */
	73	if (WARN_ON(!np))
	74	return NULL;
050794aa VK	75
	76	/* Try "cpu0" for older DTs */
	77	if (!cpu) {
	78	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	79	if (pp) {
	80	name = "cpu0";
	81	goto node_put;
	82	}
050794aa VK	83	}
	84
	85	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	86	if (pp) {
	87	name = "cpu";
	88	goto node_put;
	89	}
050794aa VK	90
050794aa VK	91	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	92	node_put:
	93	of_node_put(np);
	94	return name;
050794aa VK	95	}
050794aa VK	96
dd02a3d9	97	static int resources_available(void)
95ceafd4	98	{
d2f31f1d VK	99	struct device *cpu_dev;
	100	struct regulator *cpu_reg;
	101	struct clk *cpu_clk;
	102	int ret = 0;
dd02a3d9	103	const char *name;
95ceafd4	104
dd02a3d9	105	cpu_dev = get_cpu_device(0);
e1825b25	106	if (!cpu_dev) {
dd02a3d9	107	pr_err("failed to get cpu0 device\n");
e1825b25 SH	108	return -ENODEV;
e1825b25 SH	109	}
6754f556	110
dd02a3d9 VK	111	cpu_clk = clk_get(cpu_dev, NULL);
dd02a3d9 VK	112	ret = PTR_ERR_OR_ZERO(cpu_clk);
b331bc20	113	if (ret) {
fc31d6f5	114	/*
dd02a3d9 VK	115	* If cpu's clk node is present, but clock is not yet
dd02a3d9 VK	116	* registered, we should try defering probe.
fc31d6f5	117	*/
dd02a3d9 VK	118	if (ret == -EPROBE_DEFER)
	119	dev_dbg(cpu_dev, "clock not ready, retry\n");
	120	else
	121	dev_err(cpu_dev, "failed to get clock: %d\n", ret);
2d2c5e0e	122
dd02a3d9	123	return ret;
fc31d6f5 NM	124	}
fc31d6f5 NM	125
dd02a3d9 VK	126	clk_put(cpu_clk);
	127
	128	name = find_supply_name(cpu_dev);
	129	/* Platform doesn't require regulator */
	130	if (!name)
	131	return 0;
d2f31f1d	132
dd02a3d9 VK	133	cpu_reg = regulator_get_optional(cpu_dev, name);
	134	ret = PTR_ERR_OR_ZERO(cpu_reg);
	135	if (ret) {
48a8624b	136	/*
dd02a3d9 VK	137	* If cpu's regulator supply node is present, but regulator is
dd02a3d9 VK	138	* not yet registered, we should try defering probe.
48a8624b VK	139	*/
48a8624b VK	140	if (ret == -EPROBE_DEFER)
dd02a3d9	141	dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
48a8624b	142	else
dd02a3d9 VK	143	dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
	144
	145	return ret;
d2f31f1d VK	146	}
d2f31f1d VK	147
dd02a3d9 VK	148	regulator_put(cpu_reg);
dd02a3d9 VK	149	return 0;
d2f31f1d VK	150	}
d2f31f1d VK	151
bbcf0719	152	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d VK	153	{
d2f31f1d VK	154	struct cpufreq_frequency_table *freq_table;
91291d9a	155	struct opp_table *opp_table = NULL;
d2f31f1d VK	156	struct private_data *priv;
d2f31f1d VK	157	struct device *cpu_dev;
d2f31f1d VK	158	struct clk *cpu_clk;
d2f31f1d VK	159	unsigned int transition_latency;
1530b996	160	bool fallback = false;
050794aa	161	const char *name;
d2f31f1d VK	162	int ret;
d2f31f1d VK	163
dd02a3d9 VK	164	cpu_dev = get_cpu_device(policy->cpu);
	165	if (!cpu_dev) {
	166	pr_err("failed to get cpu%d device\n", policy->cpu);
	167	return -ENODEV;
	168	}
	169
	170	cpu_clk = clk_get(cpu_dev, NULL);
	171	if (IS_ERR(cpu_clk)) {
	172	ret = PTR_ERR(cpu_clk);
	173	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	174	return ret;
d2f31f1d VK	175	}
48a8624b	176
2e02d872	177	/* Get OPP-sharing information from "operating-points-v2" bindings */
8f8d37b2	178	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
2e02d872	179	if (ret) {
1530b996 VK	180	if (ret != -ENOENT)
	181	goto out_put_clk;
	182
2e02d872 VK	183	/*
2e02d872 VK	184	* operating-points-v2 not supported, fallback to old method of
1530b996 VK	185	* finding shared-OPPs for backward compatibility if the
1530b996 VK	186	* platform hasn't set sharing CPUs.
2e02d872	187	*/
1530b996 VK	188	if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
1530b996 VK	189	fallback = true;
2e02d872 VK	190	}
2e02d872 VK	191
050794aa VK	192	/*
	193	* OPP layer will be taking care of regulators now, but it needs to know
	194	* the name of the regulator first.
	195	*/
df2c8ec2	196	name = find_supply_name(cpu_dev);
050794aa	197	if (name) {
dfbe4678	198	opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
91291d9a SB	199	if (IS_ERR(opp_table)) {
91291d9a SB	200	ret = PTR_ERR(opp_table);
050794aa VK	201	dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
050794aa VK	202	policy->cpu, ret);
dd02a3d9	203	goto out_put_clk;
050794aa VK	204	}
	205	}
	206
2e02d872 VK	207	/*
	208	* Initialize OPP tables for all policy->cpus. They will be shared by
	209	* all CPUs which have marked their CPUs shared with OPP bindings.
	210	*
	211	* For platforms not using operating-points-v2 bindings, we do this
	212	* before updating policy->cpus. Otherwise, we will end up creating
	213	* duplicate OPPs for policy->cpus.
	214	*
	215	* OPPs might be populated at runtime, don't check for error here
	216	*/
8f8d37b2	217	dev_pm_opp_of_cpumask_add_table(policy->cpus);
2e02d872	218
7d5d0c8b VK	219	/*
	220	* But we need OPP table to function so if it is not there let's
	221	* give platform code chance to provide it for us.
	222	*/
	223	ret = dev_pm_opp_get_opp_count(cpu_dev);
	224	if (ret <= 0) {
896d6a4c	225	dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
7d5d0c8b VK	226	ret = -EPROBE_DEFER;
	227	goto out_free_opp;
	228	}
	229
1530b996	230	if (fallback) {
eb96924a	231	cpumask_setall(policy->cpus);
2e02d872 VK	232
	233	/*
	234	* OPP tables are initialized only for policy->cpu, do it for
	235	* others as well.
	236	*/
8f8d37b2	237	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
8bc86284 VK	238	if (ret)
	239	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	240	__func__, ret);
2e02d872	241	}
95ceafd4	242
d2f31f1d VK	243	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	244	if (!priv) {
	245	ret = -ENOMEM;
2f0f609f	246	goto out_free_opp;
95ceafd4 SG	247	}
95ceafd4 SG	248
050794aa	249	priv->reg_name = name;
91291d9a	250	priv->opp_table = opp_table;
95ceafd4	251
045ee45c LS	252	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	253	if (ret) {
896d6a4c	254	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
045ee45c LS	255	goto out_free_priv;
	256	}
	257
d2f31f1d	258	priv->cpu_dev = cpu_dev;
d2f31f1d	259	policy->driver_data = priv;
d2f31f1d	260	policy->clk = cpu_clk;
953ba9ff	261
3aa26a3b	262	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
953ba9ff	263
34e5a527 TP	264	ret = cpufreq_table_validate_and_show(policy, freq_table);
	265	if (ret) {
	266	dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
	267	ret);
9a004428	268	goto out_free_cpufreq_table;
d15fa862 VK	269	}
	270
	271	/* Support turbo/boost mode */
	272	if (policy_has_boost_freq(policy)) {
	273	/* This gets disabled by core on driver unregister */
	274	ret = cpufreq_enable_boost_support();
	275	if (ret)
	276	goto out_free_cpufreq_table;
21c36d35	277	cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
34e5a527 TP	278	}
34e5a527 TP	279
755b888f VK	280	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	281	if (!transition_latency)
	282	transition_latency = CPUFREQ_ETERNAL;
	283
34e5a527	284	policy->cpuinfo.transition_latency = transition_latency;
99d14d0e	285	policy->dvfs_possible_from_any_cpu = true;
34e5a527	286
95ceafd4 SG	287	return 0;
95ceafd4 SG	288
9a004428	289	out_free_cpufreq_table:
5d4879cd	290	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	291	out_free_priv:
045ee45c LS	292	kfree(priv);
2f0f609f	293	out_free_opp:
8f8d37b2	294	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
050794aa	295	if (name)
dfbe4678	296	dev_pm_opp_put_regulators(opp_table);
dd02a3d9	297	out_put_clk:
ed4b053c	298	clk_put(cpu_clk);
d2f31f1d VK	299
	300	return ret;
	301	}
	302
bbcf0719	303	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d VK	304	{
	305	struct private_data *priv = policy->driver_data;
	306
17ad13ba	307	cpufreq_cooling_unregister(priv->cdev);
d2f31f1d	308	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
8f8d37b2	309	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
050794aa	310	if (priv->reg_name)
dfbe4678	311	dev_pm_opp_put_regulators(priv->opp_table);
050794aa	312
d2f31f1d	313	clk_put(policy->clk);
d2f31f1d VK	314	kfree(priv);
	315
	316	return 0;
	317	}
	318
9a004428 VK	319	static void cpufreq_ready(struct cpufreq_policy *policy)
	320	{
	321	struct private_data *priv = policy->driver_data;
9a004428	322
3ebb62ff	323	priv->cdev = of_cpufreq_cooling_register(policy);
9a004428 VK	324	}
9a004428 VK	325
bbcf0719	326	static struct cpufreq_driver dt_cpufreq_driver = {
d2f31f1d VK	327	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
d2f31f1d VK	328	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	329	.target_index = set_target,
d2f31f1d	330	.get = cpufreq_generic_get,
bbcf0719 VK	331	.init = cpufreq_init,
bbcf0719 VK	332	.exit = cpufreq_exit,
9a004428	333	.ready = cpufreq_ready,
bbcf0719	334	.name = "cpufreq-dt",
21c36d35	335	.attr = cpufreq_dt_attr,
953ba9ff	336	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	337	};
d2f31f1d VK	338
bbcf0719	339	static int dt_cpufreq_probe(struct platform_device *pdev)
d2f31f1d	340	{
297a6622	341	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
d2f31f1d VK	342	int ret;
	343
	344	/*
	345	* All per-cluster (CPUs sharing clock/voltages) initialization is done
	346	* from ->init(). In probe(), we just need to make sure that clk and
	347	* regulators are available. Else defer probe and retry.
	348	*
	349	* FIXME: Is checking this only for CPU0 sufficient ?
	350	*/
dd02a3d9	351	ret = resources_available();
d2f31f1d VK	352	if (ret)
	353	return ret;
	354
297a6622 VK	355	if (data && data->have_governor_per_policy)
	356	dt_cpufreq_driver.flags \|= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
	357
bbcf0719	358	ret = cpufreq_register_driver(&dt_cpufreq_driver);
d2f31f1d	359	if (ret)
dd02a3d9	360	dev_err(&pdev->dev, "failed register driver: %d\n", ret);
d2f31f1d	361
95ceafd4 SG	362	return ret;
95ceafd4 SG	363	}
5553f9e2	364
bbcf0719	365	static int dt_cpufreq_remove(struct platform_device *pdev)
5553f9e2	366	{
bbcf0719	367	cpufreq_unregister_driver(&dt_cpufreq_driver);
5553f9e2 SG	368	return 0;
	369	}
	370
bbcf0719	371	static struct platform_driver dt_cpufreq_platdrv = {
5553f9e2	372	.driver = {
bbcf0719	373	.name = "cpufreq-dt",
5553f9e2	374	},
bbcf0719 VK	375	.probe = dt_cpufreq_probe,
bbcf0719 VK	376	.remove = dt_cpufreq_remove,
5553f9e2	377	};
bbcf0719	378	module_platform_driver(dt_cpufreq_platdrv);
95ceafd4	379
07949bf9	380	MODULE_ALIAS("platform:cpufreq-dt");
748c8766	381	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
95ceafd4	382	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
bbcf0719	383	MODULE_DESCRIPTION("Generic cpufreq driver");
95ceafd4	384	MODULE_LICENSE("GPL");