Re: [PATCH v3 1/7] dmaengine: of_dma: Support for DMA routers

2015-03-31 Thread Peter Ujfalusi
On 03/28/2015 03:44 AM, Arnd Bergmann wrote: > On Friday 27 March 2015, Peter Ujfalusi wrote: >> +Required property: >> +- dma-device: phandle of the DMA controller. The router is >> modifying >> + the DMA requests for this controller. > > This property seems rather

Re: [PATCH v3 1/7] dmaengine: of_dma: Support for DMA routers

2015-03-27 Thread Arnd Bergmann
On Friday 27 March 2015, Peter Ujfalusi wrote: > +Required property: > +- dma-device: phandle of the DMA controller. The router is modifying > + the DMA requests for this controller. This property seems rather specific to the case at hand, I would expect that one mig

[PATCH v3 1/7] dmaengine: of_dma: Support for DMA routers

2015-03-27 Thread Peter Ujfalusi
DMA routers are transparent devices used to mux DMA requests from peripherals to DMA controllers. They are used when the SoC integrates more devices with DMA requests then their controller can handle. DRA7x is one example of such SoC, where the sDMA can hanlde 128 DMA request lines, but in SoC leve