Re: [PATCH 6/7] dt-bindings: dmaengine: at_xdmac: add optional microchip,m2m property

Rob Herring
2020-09-22T23:33:31Z

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@microchip.com>
> ---
> 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