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: 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>

diff --git a/arch/arm/boot/dts/tango4-smp8758.dtsi b/arch/arm/boot/dts/tango4-smp8758.dtsi
index d2e65c4..eca33d5 100644 (file)
--- a/arch/arm/boot/dts/tango4-smp8758.dtsi
+++ b/arch/arm/boot/dts/tango4-smp8758.dtsi
@@ -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 {

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 49ec1c0..4c277d1 100644 (file)
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -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

diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 51221b1..227922b 100644 (file)
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -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

diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
index 2eb40d4..096aea7 100644 (file)
--- a/drivers/cpufreq/cpufreq-dt-platdev.c
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -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", },

diff --git a/drivers/cpufreq/tango-cpufreq.c b/drivers/cpufreq/tango-cpufreq.c
new file mode 100644 (file)
index 0000000..89a7f86
--- /dev/null
+++ b/drivers/cpufreq/tango-cpufreq.c
@@ -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);