msm: iommu: Create a Kconfig item for the IOMMU driver

Break the IOMMU driver out as a Kconfig item. Initially it
was decided to always build this in for 8x60, but this
driver is not strictly necessary and should be optionally
selectable.
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>

arch/arm/mach-msm/Kconfig

@@ -45,7 +45,6 @@ config ARCH_MSM8X60
 	select CPU_V7
 	select MSM_V2_TLMM
 	select MSM_GPIOMUX
-	select IOMMU_API
 	select MSM_SCM if SMP
 
 config ARCH_MSM8960
@@ -149,6 +148,18 @@ config MACH_MSM8960_RUMI3
 
 endmenu
 
+config MSM_IOMMU
+	bool "MSM IOMMU Support"
+	depends on ARCH_MSM8X60
+	select IOMMU_API
+	default n
+	help
+	  Support for the IOMMUs found on certain Qualcomm SOCs.
+	  These IOMMUs allow virtualization of the address space used by most
+	  cores within the multimedia subsystem.
+
+	  If unsure, say N here.
+
 config IOMMU_PGTABLES_L2
 	def_bool y
 	depends on ARCH_MSM8X60 && MMU && SMP && CPU_DCACHE_DISABLE=n

arch/arm/mach-msm/Makefile

@@ -4,11 +4,12 @@ obj-$(CONFIG_DEBUG_FS) += clock-debug.o
 endif
 
 obj-$(CONFIG_MSM_VIC) += irq-vic.o
+obj-$(CONFIG_MSM_IOMMU) += iommu.o iommu_dev.o
 
 obj-$(CONFIG_ARCH_MSM7X00A) += dma.o irq.o acpuclock-arm11.o
 obj-$(CONFIG_ARCH_MSM7X30) += dma.o
 obj-$(CONFIG_ARCH_QSD8X50) += dma.o sirc.o
-obj-$(CONFIG_ARCH_MSM8X60) += clock-dummy.o iommu.o iommu_dev.o devices-msm8x60-iommu.o
+obj-$(CONFIG_ARCH_MSM8X60) += clock-dummy.o devices-msm8x60-iommu.o
 obj-$(CONFIG_ARCH_MSM8960) += clock-dummy.o
 
 obj-$(CONFIG_MSM_PROC_COMM) += proc_comm.o clock-pcom.o vreg.o