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Commit 9dbd224f authored by Marc Gonzalez's avatar Marc Gonzalez Committed by Rafael J. Wysocki
Browse files

cpufreq: dt: Don't use generic platdev driver for tango 



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: default avatarMarc Gonzalez <marc_gonzalez@sigmadesigns.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent bb33270c

arch/arm/boot/dts/tango4-smp8758.dtsi

+0 −1
Original line number Diff line number Diff line
@@ -13,7 +13,6 @@ 
			reg = <0>;

			clocks = <&clkgen CPU_CLK>;

			clock-latency = <1>;

			operating-points = <1215000 0 607500 0 405000 0 243000 0 135000 0>;

		};



		cpu1: cpu@1 {

drivers/cpufreq/Kconfig.arm

+5 −0
Original line number Diff line number Diff line
@@ -241,6 +241,11 @@ config ARM_STI_CPUFREQ 
	  this config option if you wish to add CPUFreq support for STi based

	  SoCs.



config ARM_TANGO_CPUFREQ

	bool

	depends on CPUFREQ_DT && ARCH_TANGO

	default y



config ARM_TEGRA20_CPUFREQ

	bool "Tegra20 CPUFreq support"

	depends on ARCH_TEGRA

drivers/cpufreq/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa1110-cpufreq.o 
obj-$(CONFIG_ARM_SCPI_CPUFREQ)		+= scpi-cpufreq.o

obj-$(CONFIG_ARM_SPEAR_CPUFREQ)		+= spear-cpufreq.o

obj-$(CONFIG_ARM_STI_CPUFREQ)		+= sti-cpufreq.o

obj-$(CONFIG_ARM_TANGO_CPUFREQ)		+= tango-cpufreq.o

obj-$(CONFIG_ARM_TEGRA20_CPUFREQ)	+= tegra20-cpufreq.o

obj-$(CONFIG_ARM_TEGRA124_CPUFREQ)	+= tegra124-cpufreq.o

obj-$(CONFIG_ARM_TEGRA186_CPUFREQ)	+= tegra186-cpufreq.o

drivers/cpufreq/cpufreq-dt-platdev.c

+0 −2
Original line number Diff line number Diff line
@@ -80,8 +80,6 @@ static const struct of_device_id machines[] __initconst = { 
	{ .compatible = "rockchip,rk3368", },

	{ .compatible = "rockchip,rk3399", },



	{ .compatible = "sigma,tango4" },



	{ .compatible = "socionext,uniphier-pro5", },

	{ .compatible = "socionext,uniphier-pxs2", },

	{ .compatible = "socionext,uniphier-ld6b", },

drivers/cpufreq/tango-cpufreq.c

0 → 100644
+38 −0
Original line number Diff line number Diff line 
#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);