diff options
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/of/address.c | 6 |
2 files changed, 9 insertions, 1 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index 37c2ccbefecd..d91618641be6 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 99c1b8058559..e8a39c3ec4d4 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -995,12 +995,16 @@ out: * @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); |