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authorMarc Gonzalez <marc_gonzalez@sigmadesigns.com>2017-07-18 19:48:39 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-07-22 03:20:59 +0300
commit9dbd224f9e4e3285a1aba4c3c5683cee20e3c30c (patch)
tree536c31f02d3fbba0e7f001dd07bdfb247ccd8d8d /drivers
parentbb33270c02a9bb32d81a8dc83f8f2f3aea796404 (diff)
downloadlinux-9dbd224f9e4e3285a1aba4c3c5683cee20e3c30c.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpufreq/Kconfig.arm5
-rw-r--r--drivers/cpufreq/Makefile1
-rw-r--r--drivers/cpufreq/cpufreq-dt-platdev.c2
-rw-r--r--drivers/cpufreq/tango-cpufreq.c38
4 files changed, 44 insertions, 2 deletions
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 49ec1c0c395a..4c277d11831b 100644
--- 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 51221b1e1f15..227922b0d42c 100644
--- 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 2eb40d46d357..096aea7fcb67 100644
--- 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
index 000000000000..89a7f860bfe8
--- /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);