cpufreq: tegra: create CONFIG_ARM_TEGRA_CPUFREQ

currently Tegra cpufreq driver gets built based on ARCH_TEGRA, which doesn't
depend on nor select CPU_FREQ itself, so:

        select CPU_FREQ_TABLE if CPU_FREQ

... isn't guaranteed to fire.

The correct solution seems to be:

* Add CONFIG_ARM_TEGRA_CPUFREQ to drivers/cpufreq/Kconfig.arm.
* Make that Kconfig option selct CPU_FREQ_TABLE.
* Make that Kconfig option be def_bool ARCH_TEGRA.
* Modify drivers/cpufreq/Makefile to build tegra-cpufreq.c based on that.
* Remove all the cpufreq-related stuff from arch/arm/mach-tegra/Kconfig.

That way, tegra-cpufreq.c can't be built if !CPU_FREQ, and Tegra's
cpufreq works the same way as all the other cpufreq drivers.

This patch does it.

Suggested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

2 files changed, 9 insertions, 1 deletions

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index d52261b22b55..5085427eb29d 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -154,3 +154,11 @@ config ARM_SPEAR_CPUFREQ
         default y
         help
           This adds the CPUFreq driver support for SPEAr SOCs.
+
+config ARM_TEGRA_CPUFREQ
+        bool "TEGRA CPUFreq support"
+        depends on ARCH_TEGRA
+        select CPU_FREQ_TABLE
+        default y
+        help
+          This adds the CPUFreq driver support for TEGRA SOCs.
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 13c3f831d3dc..9c873e778ee0 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -71,7 +71,7 @@ obj-$(CONFIG_ARM_S5PV210_CPUFREQ)	+= s5pv210-cpufreq.o
 obj-$(CONFIG_ARM_SA1100_CPUFREQ)        += sa1100-cpufreq.o
 obj-$(CONFIG_ARM_SA1110_CPUFREQ)        += sa1110-cpufreq.o
 obj-$(CONFIG_ARM_SPEAR_CPUFREQ)         += spear-cpufreq.o
-obj-$(CONFIG_ARCH_TEGRA)                += tegra-cpufreq.o
+obj-$(CONFIG_ARM_TEGRA_CPUFREQ)         += tegra-cpufreq.o
 
 ##################################################################################
 # PowerPC platform drivers