--- linux-4.9.37/include/linux/dma-mapping.h	2017-07-12 16:42:41.000000000 +0300
+++ linux-4.9.y/include/linux/dma-mapping.h	2021-06-07 13:01:34.000000000 +0300
@@ -705,6 +705,8 @@
 /*
  * Managed DMA API
  */
+void bsp_dmac_map_area(const void *kaddr, size_t size,
+			enum dma_data_direction dir);
 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 				 dma_addr_t *dma_handle, gfp_t gfp);
 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,