diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a80669209155..6f475dc5829b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -230,6 +230,7 @@ config PPC
 	select NEED_SG_DMA_LENGTH
 	select NO_BOOTMEM
 	select OF
+	select OF_DMA_DEFAULT_COHERENT		if !NOT_COHERENT_CACHE
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
 	select OLD_SIGACTION			if PPC32
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index ad3fcad4d75b..5e1315900562 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -103,4 +103,8 @@ config OF_OVERLAY
 config OF_NUMA
 	bool
 
+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 7ddbf0a1ab86..c42aebba35ab 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -970,12 +970,16 @@ 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);