ARM: tegra: Add external memory controller driver

The frequency memory bus on Tegra can be adjusted without
disabling accesses to memory by updating the memory
configuration registers from a per-board table, and then
changing the clock frequency.  The clock controller and
memory controller have an interlock that prevents the
new memory registers from taking effect until the
clock frequency change.

Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Colin Cross <ccross@android.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index f0fda77395e5..cac8a79e738e 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -65,3 +65,6 @@ config TEGRA_SYSTEM_DMA
           several Tegra device drivers
 
 endif
+
+config TEGRA_EMC_SCALING_ENABLE
+        bool "Enable scaling the memory frequency"