Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * System Control and Power Interface (SCPI) based CPUFreq Interface driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2015 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Sudeep Holla <sudeep.holla@arm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * This program is free software; you can redistribute it and/or modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * it under the terms of the GNU General Public License version 2 as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * published by the Free Software Foundation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * kind, whether express or implied; without even the implied warranty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * GNU General Public License for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/pm_opp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/scpi_protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) struct scpi_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct device *cpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static struct scpi_ops *scpi_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static unsigned int scpi_cpufreq_get_rate(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct scpi_data *priv = policy->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	unsigned long rate = clk_get_rate(priv->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	return rate / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) scpi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	u64 rate = policy->freq_table[index].frequency * 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	struct scpi_data *priv = policy->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	ret = clk_set_rate(priv->clk, rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (clk_get_rate(priv->clk) != rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) scpi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	int cpu, domain, tdomain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct device *tcpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	domain = scpi_ops->device_domain_id(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (domain < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		return domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		if (cpu == cpu_dev->id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		tcpu_dev = get_cpu_device(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		if (!tcpu_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		tdomain = scpi_ops->device_domain_id(tcpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		if (tdomain == domain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			cpumask_set_cpu(cpu, cpumask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) static int scpi_cpufreq_init(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	unsigned int latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct device *cpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	struct scpi_data *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	struct cpufreq_frequency_table *freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	cpu_dev = get_cpu_device(policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (!cpu_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		pr_err("failed to get cpu%d device\n", policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	ret = scpi_ops->add_opps_to_device(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		dev_warn(cpu_dev, "failed to add opps to the device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	ret = scpi_get_sharing_cpus(cpu_dev, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		dev_warn(cpu_dev, "failed to get sharing cpumask\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			__func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	ret = dev_pm_opp_get_opp_count(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (ret <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		ret = -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		goto out_free_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (!priv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		goto out_free_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		goto out_free_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	priv->cpu_dev = cpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	priv->clk = clk_get(cpu_dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (IS_ERR(priv->clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			__func__, cpu_dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		ret = PTR_ERR(priv->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		goto out_free_cpufreq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	policy->driver_data = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	policy->freq_table = freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	/* scpi allows DVFS request for any domain from any CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	policy->dvfs_possible_from_any_cpu = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	latency = scpi_ops->get_transition_latency(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	if (!latency)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		latency = CPUFREQ_ETERNAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	policy->cpuinfo.transition_latency = latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	policy->fast_switch_possible = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) out_free_cpufreq_table:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) out_free_priv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) out_free_opp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	dev_pm_opp_remove_all_dynamic(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static int scpi_cpufreq_exit(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct scpi_data *priv = policy->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	clk_put(priv->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static struct cpufreq_driver scpi_cpufreq_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	.name	= "scpi-cpufreq",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	.flags	= CPUFREQ_STICKY | CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		  CPUFREQ_NEED_INITIAL_FREQ_CHECK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		  CPUFREQ_IS_COOLING_DEV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	.verify	= cpufreq_generic_frequency_table_verify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	.attr	= cpufreq_generic_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	.get	= scpi_cpufreq_get_rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	.init	= scpi_cpufreq_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	.exit	= scpi_cpufreq_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	.target_index	= scpi_cpufreq_set_target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static int scpi_cpufreq_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	scpi_ops = get_scpi_ops();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (!scpi_ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	ret = cpufreq_register_driver(&scpi_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		dev_err(&pdev->dev, "%s: registering cpufreq failed, err: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			__func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static int scpi_cpufreq_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	cpufreq_unregister_driver(&scpi_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	scpi_ops = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static struct platform_driver scpi_cpufreq_platdrv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		.name	= "scpi-cpufreq",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	.probe		= scpi_cpufreq_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	.remove		= scpi_cpufreq_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) module_platform_driver(scpi_cpufreq_platdrv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) MODULE_ALIAS("platform:scpi-cpufreq");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) MODULE_DESCRIPTION("ARM SCPI CPUFreq interface driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) MODULE_LICENSE("GPL v2");