diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h
index f23f8d8..a3954e4 100644
--- a/arch/powerpc/include/asm/device.h
+++ b/arch/powerpc/include/asm/device.h
@@ -28,6 +28,7 @@
 };
 
 struct pdev_archdata {
+	u64 dma_mask;
 };
 
 #endif /* _ASM_POWERPC_DEVICE_H */
diff --git a/arch/powerpc/include/asm/of_device.h b/arch/powerpc/include/asm/of_device.h
index 8b26f96..444e97e 100644
--- a/arch/powerpc/include/asm/of_device.h
+++ b/arch/powerpc/include/asm/of_device.h
@@ -12,8 +12,8 @@
  */
 struct of_device
 {
-	u64			dma_mask;	/* DMA mask */
 	struct device		dev;		/* Generic device interface */
+	struct pdev_archdata	archdata;
 };
 
 extern struct of_device *of_device_alloc(struct device_node *np,
diff --git a/arch/powerpc/kernel/of_device.c b/arch/powerpc/kernel/of_device.c
index 20b3474..df78e02 100644
--- a/arch/powerpc/kernel/of_device.c
+++ b/arch/powerpc/kernel/of_device.c
@@ -70,7 +70,7 @@
 		return NULL;
 
 	dev->dev.of_node = of_node_get(np);
-	dev->dev.dma_mask = &dev->dma_mask;
+	dev->dev.dma_mask = &dev->archdata.dma_mask;
 	dev->dev.parent = parent;
 	dev->dev.release = of_release_dev;
 
diff --git a/arch/powerpc/kernel/of_platform.c b/arch/powerpc/kernel/of_platform.c
index 1c747c4..2188534 100644
--- a/arch/powerpc/kernel/of_platform.c
+++ b/arch/powerpc/kernel/of_platform.c
@@ -74,7 +74,7 @@
 	if (!dev)
 		return NULL;
 
-	dev->dma_mask = 0xffffffffUL;
+	dev->archdata.dma_mask = 0xffffffffUL;
 	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	dev->dev.bus = &of_platform_bus_type;
diff --git a/drivers/macintosh/macio_asic.c b/drivers/macintosh/macio_asic.c
index 67fe13f..48a5f04 100644
--- a/drivers/macintosh/macio_asic.c
+++ b/drivers/macintosh/macio_asic.c
@@ -374,8 +374,8 @@
 	dev->bus = &chip->lbus;
 	dev->media_bay = in_bay;
 	dev->ofdev.dev.of_node = np;
-	dev->ofdev.dma_mask = 0xffffffffUL;
-	dev->ofdev.dev.dma_mask = &dev->ofdev.dma_mask;
+	dev->ofdev.archdata.dma_mask = 0xffffffffUL;
+	dev->ofdev.dev.dma_mask = &dev->ofdev.archdata.dma_mask;
 	dev->ofdev.dev.parent = parent;
 	dev->ofdev.dev.bus = &macio_bus_type;
 	dev->ofdev.dev.release = macio_release_dev;
diff --git a/sound/aoa/soundbus/i2sbus/core.c b/sound/aoa/soundbus/i2sbus/core.c
index 7672b4d..6789337 100644
--- a/sound/aoa/soundbus/i2sbus/core.c
+++ b/sound/aoa/soundbus/i2sbus/core.c
@@ -221,9 +221,9 @@
 
 	mutex_init(&dev->lock);
 	spin_lock_init(&dev->low_lock);
-	dev->sound.ofdev.dma_mask = macio->ofdev.dma_mask;
+	dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask;
 	dev->sound.ofdev.dev.of_node = np;
-	dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.dma_mask;
+	dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.dma_mask;
 	dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
 	dev->sound.ofdev.dev.release = i2sbus_release_dev;
 	dev->sound.attach_codec = i2sbus_attach_codec;