--- zzzz-none-000/linux-5.4.213/Documentation/DMA-API.txt	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/Documentation/DMA-API.txt	2024-08-14 09:01:23.000000000 +0000
@@ -603,6 +603,17 @@
 region only at the granularity of a page.  For smaller allocations,
 you should use the dma_pool() API.
 
+::
+
+	void
+	dma_release_declared_memory(struct device *dev)
+
+Remove the memory region previously declared from the system.  This
+API performs *no* in-use checking for this region and will return
+unconditionally having removed all the required structures.  It is the
+driver's job to ensure that no parts of this memory region are
+currently in use.
+
 Part III - Debug drivers use of the DMA-API
 -------------------------------------------