On Fri, Oct 30, 2015 at 10:00:37AM +0200, Peter Ujfalusi wrote: > In eDMA the events are directly mapped to a DMA channel (for example DMA > event 14 can only be handled by DMA channel 14). If the memcpy is enabled > on the eDMA, there is a possibility that the crossbar driver would assign > DMA event number already allocated in eDMA for memcpy. Furthermore the > eDMA can be shared with DSP in which case the crossbar driver should also > avoid mapping xbar events to DSP used event numbers (or channels). > > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx> > --- > .../devicetree/bindings/dma/ti-dma-crossbar.txt | 6 +++ > drivers/dma/ti-dma-crossbar.c | 47 ++++++++++++++++++++-- > 2 files changed, 49 insertions(+), 4 deletions(-) > > diff --git a/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt > index b152a75dceae..aead5869a28d 100644 > --- a/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt > +++ b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt > @@ -14,6 +14,10 @@ The DMA controller node need to have the following poroperties: > > Optional properties: > - ti,dma-safe-map: Safe routing value for unused request lines > +- ti,reserved-dma-request-ranges: DMA request ranges which should not be used > + when mapping xbar input to DMA request, they are either > + allocated to be used by for example the DSP or they are used as > + memcpy channels in eDMA. How many requests are there? I think I'd rather see this as a mask value. Rob -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
