forked from mirrors/linux
9dbd224f9e
On tango platforms, firmware configures the CPU clock, and Linux is then only allowed to use the cpu_clk_divider to change the frequency. Build the OPP table dynamically at init, in order to support whatever firmware throws at us. Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
38 lines
927 B
C
38 lines
927 B
C
#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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