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- #include <linux/of.h>
- #include <linux/cpu.h>
- #include <linux/clk.h>
- #include <linux/pm_opp.h>
- #include <linux/platform_device.h>
- static const struct of_device_id machines[] __initconst = {
- { .compatible = "sigma,tango4" },
- { /* sentinel */ }
- };
- static int __init tango_cpufreq_init(void)
- {
- struct device *cpu_dev = get_cpu_device(0);
- unsigned long max_freq;
- struct clk *cpu_clk;
- void *res;
- if (!of_match_node(machines, of_root))
- return -ENODEV;
- cpu_clk = clk_get(cpu_dev, NULL);
- if (IS_ERR(cpu_clk))
- return -ENODEV;
- max_freq = clk_get_rate(cpu_clk);
- dev_pm_opp_add(cpu_dev, max_freq / 1, 0);
- dev_pm_opp_add(cpu_dev, max_freq / 2, 0);
- dev_pm_opp_add(cpu_dev, max_freq / 3, 0);
- dev_pm_opp_add(cpu_dev, max_freq / 5, 0);
- dev_pm_opp_add(cpu_dev, max_freq / 9, 0);
- res = platform_device_register_data(NULL, "cpufreq-dt", -1, NULL, 0);
- return PTR_ERR_OR_ZERO(res);
- }
- device_initcall(tango_cpufreq_init);
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