1#include <linux/of.h>
 2#include <linux/cpu.h>
 3#include <linux/clk.h>
 4#include <linux/pm_opp.h>
 5#include <linux/platform_device.h>
 6
 7static const struct of_device_id machines[] __initconst = {
 8	{ .compatible = "sigma,tango4" },
 9	{ /* sentinel */ }
10};
11
12static int __init tango_cpufreq_init(void)
13{
14	struct device *cpu_dev = get_cpu_device(0);
15	unsigned long max_freq;
16	struct clk *cpu_clk;
17	void *res;
18
19	if (!of_match_node(machines, of_root))
20		return -ENODEV;
21
22	cpu_clk = clk_get(cpu_dev, NULL);
23	if (IS_ERR(cpu_clk))
24		return -ENODEV;
25
26	max_freq = clk_get_rate(cpu_clk);
27
28	dev_pm_opp_add(cpu_dev, max_freq / 1, 0);
29	dev_pm_opp_add(cpu_dev, max_freq / 2, 0);
30	dev_pm_opp_add(cpu_dev, max_freq / 3, 0);
31	dev_pm_opp_add(cpu_dev, max_freq / 5, 0);
32	dev_pm_opp_add(cpu_dev, max_freq / 9, 0);
33
34	res = platform_device_register_data(NULL, "cpufreq-dt", -1, NULL, 0);
35
36	return PTR_ERR_OR_ZERO(res);
37}
38device_initcall(tango_cpufreq_init);