mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
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>
39 lines
927 B
C
39 lines
927 B
C
#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);
|