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

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Date:   Tue, 22 Sep 2020 17:33:27 -0600
From:   Rob Herring <robh@...nel.org>
To:     Eugen Hristev <eugen.hristev@...rochip.com>
Cc:     vkoul@...nel.org, tudor.ambarus@...rochip.com,
        ludovic.desroches@...rochip.com, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, nicolas.ferre@...rochip.com
Subject: Re: [PATCH 6/7] dt-bindings: dmaengine: at_xdmac: add optional
 microchip,m2m property

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@...rochip.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