On Wednesday 24 June 2015 21:54:01 Vinod Koul wrote: > > It would be nice to find another name for the > > dma_request_slave_channel_compat() so with the new name we could have chance > > to rearrange the parameters: (dev, name, mask, fn, fn_param) > > > > We would end up with the following APIs, all returning with error code on failure: > > dma_request_slave_channel(dev, name); > > dma_request_channel_legacy(mask, fn, fn_param); > > dma_request_slave_channel_compat(mask, fn, fn_param, dev, name); > > dma_request_any_channel(mask); > This is good idea but still we end up with 4 APIs. Why not just converge to > two API, one legacy + memcpy + filer fn and one untimate API for slave? > > Internally we may have 4 APIs for cleaner handling... > Not sure if it's realistic, but I think it would be nice to have a way for converting the current slave drivers that use the mask/filter/param API to the dev/name based API. We should be able to do this by registering a lookup table from platform code that translates one to the other, like we do with the clkdev lookup to find a device clock based on a local identifier. The main downside of this is that it's a lot of work if we want to completely remove dma_request_channel() for slave drivers, but it could be done more gradually. Another upside is that we could come up with a mechanism to avoid the link-time dependency on the filter-function that causes problems when that filter is defined in a loadable module for the dmaengine driver. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
