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

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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>
This commit is contained in:
Marc Gonzalez 2017-07-18 18:48:39 +02:00 committed by Rafael J. Wysocki
parent bb33270c02
commit 9dbd224f9e
5 changed files with 44 additions and 3 deletions
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1
arch/arm/boot/dts/tango4-smp8758.dtsi
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@ -13,7 +13,6 @@ cpu0: cpu@0 {
reg = <0>; reg = <0>;
clocks = <&clkgen CPU_CLK>; clocks = <&clkgen CPU_CLK>;
clock-latency = <1>; clock-latency = <1>;
operating-points = <1215000 0 607500 0 405000 0 243000 0 135000 0>;
}; };
cpu1: cpu@1 { cpu1: cpu@1 {

5
drivers/cpufreq/Kconfig.arm
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@ -241,6 +241,11 @@ config ARM_STI_CPUFREQ
this config option if you wish to add CPUFreq support for STi based this config option if you wish to add CPUFreq support for STi based
SoCs. SoCs.
config ARM_TANGO_CPUFREQ
bool
depends on CPUFREQ_DT && ARCH_TANGO
default y
config ARM_TEGRA20_CPUFREQ config ARM_TEGRA20_CPUFREQ
bool "Tegra20 CPUFreq support" bool "Tegra20 CPUFreq support"
depends on ARCH_TEGRA depends on ARCH_TEGRA

1
drivers/cpufreq/Makefile
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@ -75,6 +75,7 @@ obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa1110-cpufreq.o
obj-$(CONFIG_ARM_SCPI_CPUFREQ) += scpi-cpufreq.o obj-$(CONFIG_ARM_SCPI_CPUFREQ) += scpi-cpufreq.o
obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o
obj-$(CONFIG_ARM_STI_CPUFREQ) += sti-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_TEGRA20_CPUFREQ) += tegra20-cpufreq.o
obj-$(CONFIG_ARM_TEGRA124_CPUFREQ) += tegra124-cpufreq.o obj-$(CONFIG_ARM_TEGRA124_CPUFREQ) += tegra124-cpufreq.o
obj-$(CONFIG_ARM_TEGRA186_CPUFREQ) += tegra186-cpufreq.o obj-$(CONFIG_ARM_TEGRA186_CPUFREQ) += tegra186-cpufreq.o

2
drivers/cpufreq/cpufreq-dt-platdev.c
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@ -80,8 +80,6 @@ static const struct of_device_id machines[] __initconst = {
{ .compatible = "rockchip,rk3368", }, { .compatible = "rockchip,rk3368", },
{ .compatible = "rockchip,rk3399", }, { .compatible = "rockchip,rk3399", },
{ .compatible = "sigma,tango4" },
{ .compatible = "socionext,uniphier-pro5", }, { .compatible = "socionext,uniphier-pro5", },
{ .compatible = "socionext,uniphier-pxs2", }, { .compatible = "socionext,uniphier-pxs2", },
{ .compatible = "socionext,uniphier-ld6b", }, { .compatible = "socionext,uniphier-ld6b", },

38
drivers/cpufreq/tango-cpufreq.c Normal file
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@ -0,0 +1,38 @@
#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);