Blackfin arch: enable a choice to provide 4M DMA memory

support two cascaded AD73322 cards, more uncached DMA
memory is needed, so add a choice to provide 4M DMA memory

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 785d8b4fa0cb..b87634e75f20 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -685,6 +685,8 @@ choice
         prompt "Uncached SDRAM region"
         default DMA_UNCACHED_1M
         depends on BFIN_DMA_5XX
+config DMA_UNCACHED_4M
+        bool "Enable 4M DMA region"
 config DMA_UNCACHED_2M
         bool "Enable 2M DMA region"
 config DMA_UNCACHED_1M