LXR linux/drivers/cpufreq/tango-cpufreq.c

   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);
  39