Does this fix your warning?

diff --git a/drivers/macintosh/macio_asic.c b/drivers/macintosh/macio_asic.c
index 62f541f968f6..07074820a167 100644
--- a/drivers/macintosh/macio_asic.c
+++ b/drivers/macintosh/macio_asic.c
@@ -375,6 +375,7 @@ static struct macio_dev * macio_add_one_device(struct 
macio_chip *chip,
        dev->ofdev.dev.of_node = np;
        dev->ofdev.archdata.dma_mask = 0xffffffffUL;
        dev->ofdev.dev.dma_mask = &dev->ofdev.archdata.dma_mask;
+       dev->ofdev.dev.coherent_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;
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