[PATCH 5/6] dma-mapping: support fsl-mc bus

Christoph Hellwig hch at lst.de
Thu Mar 8 18:41:15 AEDT 2018

On Tue, Mar 06, 2018 at 04:41:56AM +0000, Nipun Gupta wrote:
> Sorry for asking a trivial question - looking into dma_configure() I see that
> PCI is used in the start and the end of the API.
> In the end part pci_put_host_bridge_device() is called.
> So are two bus callbacks something like 'dma_config_start' & 'dma_config_end'
> will be required where the former one will return "dma_dev"?

I'd just use dma_configure as the callback.

Currently the of_dma_configure and acpi_dma_configure are only used
for PCI anyway, as no one else sets a non-NULL dma dev.   For fsl-mc
I suspect only of_dma_configure is relevanet, so just call that directly.
If at some point we get enough busses with either OF or ACPI we could
create a helper called from ->dma_configure for that.

More information about the Linuxppc-dev mailing list