[PATCH 13/21] iommu/mediatek: Make MTK_IOMMU depend on ARM64

[Yong Wu]

Originally MTK_IOMMU could depend on ARM || ARM64.
Both build ok. actually the source code don't support ARM.
this patch changes it only depend on ARM64.

This is a preparing patch for support multi-domain.
otherwise it will build warning in ARM case.

This is the build warning log:

drivers/iommu/mtk_iommu.c:163:27: note: in expansion of macro 'SZ_4G'
  {.iova_base = 0, .size = SZ_4G},
include/uapi/linux/const.h:20:19: warning: large integer implicitly truncated
to unsigned type [-Woverflow]
 #define __AC(X,Y) (X##Y)
                   ^
include/uapi/linux/const.h:21:18: note: in expansion of macro '__AC'
 #define _AC(X,Y) __AC(X,Y)
                  ^
include/linux/sizes.h:46:18: note: in expansion of macro '_AC'
 #define SZ_4G    _AC(0x100000000, ULL)

Signed-off-by: Yong Wu <yong.wu at mediatek.com>
---
 drivers/iommu/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index b510f67dfa49..6bebfd3e0021 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -467,6 +467,7 @@ config S390_AP_IOMMU
 config MTK_IOMMU
 	bool "MTK IOMMU Support"
 	depends on HAS_DMA
+	depends on ARM64
 	depends on ARCH_MEDIATEK || COMPILE_TEST
 	select ARM_DMA_USE_IOMMU
 	select IOMMU_API
-- 
2.18.0