cpufreq / boost: Kconfig: Support for software-managed BOOST

Add CONFIG_CPU_FREQ_BOOST_SW Kconfig option such that software-managed
boost is enabled only after selecting "EXYNOS Frequency Overclocking -
Software".  It also depends on the thermal subsystem to be compiled in,
which is necessary for disabling boost and cooling down the device when
overheating is detected.

Software-managed boost _MUST_ _NOT_ be enabled without thermal subsystem
with properly defined overheating temperature thresholds.

This option doesn't affect the x86's hardware-driven boost support
in the acpi-cpufreq driver.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[rjw: Subject and changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 386dbc9ccdfdc36a1dca49ca917cbd6423922081..d100926aca0abd2f9ac77161ef8a9d1d6fc9785a 100644 (file)
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -20,6 +20,10 @@ if CPU_FREQ
 config CPU_FREQ_GOV_COMMON
        bool
 
+config CPU_FREQ_BOOST_SW
+       bool
+       depends on THERMAL
+
 config CPU_FREQ_STAT
        tristate "CPU frequency translation statistics"
        default y

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 0468ad1473012d38a1b862cafeb4af10d84cc924..31297499a60ad94d8f7636271bb64e1832b4209a 100644 (file)
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -66,6 +66,21 @@ config ARM_EXYNOS5440_CPUFREQ
 
          If in doubt, say N.
 
+config ARM_EXYNOS_CPU_FREQ_BOOST_SW
+       bool "EXYNOS Frequency Overclocking - Software"
+       depends on ARM_EXYNOS_CPUFREQ
+       select CPU_FREQ_BOOST_SW
+       select EXYNOS_THERMAL
+       help
+         This driver supports software managed overclocking (BOOST).
+         It allows usage of special frequencies for Samsung Exynos
+         processors if thermal conditions are appropriate.
+
+         It reguires, for safe operation, thermal framework with properly
+         defined trip points.
+
+         If in doubt, say N.
+
 config ARM_HIGHBANK_CPUFREQ
        tristate "Calxeda Highbank-based"
        depends on ARCH_HIGHBANK