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