cpufreq: exynos: Add cpufreq driver for exynos5440

This patch adds dvfs support for exynos5440 SOC. This soc has 4 cores and
they scale at same frequency. The nature of exynos5440 clock controller is
different from previous exynos controllers so not using the common exynos
cpufreq framework. The major difference being interrupt notification for
frequency change. Also, OPP library is used for device tree parsing to get
different parameters like frequency, voltage etc. Since the opp library sorts
the frequency table in ascending order so they are again re-arranged in
descending order. This will have one-to-one mapping with the clock controller
state management logic.

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 09da6a3f0e8f..83bd5c148d85 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -42,6 +42,15 @@ config ARM_EXYNOS5250_CPUFREQ
           This adds the CPUFreq driver for Samsung EXYNOS5250
           SoC.
 
+config ARM_EXYNOS5440_CPUFREQ
+        def_bool SOC_EXYNOS5440
+        depends on HAVE_CLK && PM_OPP && OF
+        help
+          This adds the CPUFreq driver for Samsung EXYNOS5440
+          SoC. The nature of exynos5440 clock controller is
+          different than previous exynos controllers so not using
+          the common exynos framework.
+
 config ARM_HIGHBANK_CPUFREQ
         tristate "Calxeda Highbank-based"
         depends on ARCH_HIGHBANK