cpufreq: Add SFI based cpufreq driver support

This adds the SFI based cpu freq driver for some of the Intel's
Silvermont based Atom architectures like Z34xx and Z35xx.

Signed-off-by: Rudramuni, Vishwesh M <vishwesh.m.rudramuni@intel.com>
Signed-off-by: Srinidhi Kasagar <srinidhi.kasagar@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index 89ae88f91895..c59bdcb83217 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -57,6 +57,16 @@ config X86_ACPI_CPUFREQ_CPB
           By enabling this option the acpi_cpufreq driver provides the old
           entry in addition to the new boost ones, for compatibility reasons.
 
+config X86_SFI_CPUFREQ
+        tristate "SFI Performance-States driver"
+        depends on X86_INTEL_MID && SFI
+        help
+          This adds a CPUFreq driver for some Silvermont based Intel Atom
+          architectures like Z34xx and Z35xx which enumerate processor
+          performance states through SFI.
+
+          If in doubt, say N.
+
 config ELAN_CPUFREQ
         tristate "AMD Elan SC400 and SC410"
         depends on MELAN