On Mon, Sep 14, 2020 at 05:09:55PM +0300, Eugen Hristev wrote: > Add optional microchip,m2m property that specifies if a controller is > dedicated to memory to memory operations only. > > Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx> > --- > Documentation/devicetree/bindings/dma/atmel-xdma.txt | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/dma/atmel-xdma.txt b/Documentation/devicetree/bindings/dma/atmel-xdma.txt > index 510b7f25ba24..642da6b95a29 100644 > --- a/Documentation/devicetree/bindings/dma/atmel-xdma.txt > +++ b/Documentation/devicetree/bindings/dma/atmel-xdma.txt > @@ -15,6 +15,12 @@ the dmas property of client devices. > interface identifier, > - bit 30-24: PERID, peripheral identifier. > > +Optional properties: > +- microchip,m2m: this controller is connected on AXI only to memory and it's > + dedicated to memory to memory DMA operations. If this option is > + missing, it's assumed that the DMA controller is connected to > + peripherals, thus it's a per2mem and mem2per. Wouldn't 'dma-requests = <0>' cover this case? Rob
