ARM: keystone: enable DMA zone for LPAE

Keystone II peripheral devices support 32-bit DMA and hence can access only
first 2GB of the memory address space. So set the platform dma_zone_size
to handle that case.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mach-keystone/Kconfig b/arch/arm/mach-keystone/Kconfig
index 8a9e943a3240..dabc5eee52e7 100644
--- a/arch/arm/mach-keystone/Kconfig
+++ b/arch/arm/mach-keystone/Kconfig
@@ -12,6 +12,7 @@ config ARCH_KEYSTONE
         select COMMON_CLK_KEYSTONE
         select TI_EDMA
         select ARCH_SUPPORTS_BIG_ENDIAN
+        select ZONE_DMA if ARM_LPAE
         help
           Support for boards based on the Texas Instruments Keystone family of
           SoCs.
diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index b661c5c2870a..2fe4dd04996c 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -68,6 +68,9 @@ void keystone_restart(enum reboot_mode mode, const char *cmd)
 }
 
 DT_MACHINE_START(KEYSTONE, "Keystone")
+#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+        .dma_zone_size  = SZ_2G,
+#endif
         .smp            = smp_ops(keystone_smp_ops),
         .init_machine   = keystone_init,
         .dt_compat      = keystone_match,