diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 9b439ac..c005495 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -216,6 +216,8 @@
 	dev->archdata.dma_mask = 0xffffffffUL;
 #endif
 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+	if (!dev->dev.dma_mask)
+		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
 	dev->dev.bus = &platform_bus_type;
 	dev->dev.platform_data = platform_data;