diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 01b6c00a7060..4ece20178145 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -93,6 +93,7 @@ config PPC
 	select BINFMT_ELF
 	select ARCH_HAS_ELF_RANDOMIZE
 	select OF
+	select OF_DMA_DEFAULT_COHERENT		if !NOT_COHERENT_CACHE
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
 	select HAVE_FTRACE_MCOUNT_RECORD
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index e2a48415d969..4ba54ffb3a4b 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -112,4 +112,8 @@ config OF_OVERLAY
 	  While this option is selected automatically when needed, you can
 	  enable it manually to improve device tree unit test coverage.
 
+config OF_DMA_DEFAULT_COHERENT
+	# arches should select this if DMA is coherent by default for OF devices
+	bool
+
 endif # OF
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 4fe5fe21cd49..b3bf8762f4e8 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -1009,12 +1009,16 @@ EXPORT_SYMBOL_GPL(of_dma_get_range);
  * @np:	device node
  *
  * It returns true if "dma-coherent" property was found
- * for this device in DT.
+ * for this device in the DT, or if DMA is coherent by
+ * default for OF devices on the current platform.
  */
 bool of_dma_is_coherent(struct device_node *np)
 {
 	struct device_node *node = of_node_get(np);
 
+	if (IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT))
+		return true;
+
 	while (node) {
 		if (of_property_read_bool(node, "dma-coherent")) {
 			of_node_put(node);