mfd: Inherit coherent_dma_mask from parent device

dma_mask and dma_parms are already inherited from the parent device but
dma_coherent_mask was left uninitialized (set to zero thanks to kzalloc).
Set sub-device coherent_dma_mask to its parent value to simplify
sub-drivers making use of dma coherent helper functions (those drivers
currently have to explicitly set the dma coherent mask using
dma_set_coherent_mask function).

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 892d343193ad..5d0fbe1e097a 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -101,6 +101,7 @@ static int mfd_add_device(struct device *parent, int id,
         pdev->dev.type = &mfd_dev_type;
         pdev->dev.dma_mask = parent->dma_mask;
         pdev->dev.dma_parms = parent->dma_parms;
+        pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
 
         ret = regulator_bulk_register_supply_alias(
                         &pdev->dev, cell->parent_supplies,