On Fri, Mar 7, 2014 at 6:16 AM, Sricharan R <r.sricharan@xxxxxx> wrote: > In some SoCs the dma request lines from the peripherals are > routed to the dma-controller through a crossbar. With this the > dma controller's available request lines are shared between the > peripherals. > > This adds support to register the crossbar router associated with > a dma-channel and let the dma-controller driver map/unmap > the peripheral dma crossbar line to dma-controller's request > line. This is not a unique concept and should follow some existing pattern. Perhaps something like interrupt-map. For the dmas property, the parent should be the crossbar and then the crossbar block has to translate that into the DMA controller request. All the DMA ctrlr request connections should be described in the crossbar node. In theory, you could have chained crossbars. This should be documented as part of the generic DMA binding. There are also other similar IP like CoreSight CTI which are just signal routers. So there is probably some possibility of common code here. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
