linux-kernel - Re: [PATCH net-next V3 1/3] dt-bindings: net: xilinx_axienet: Introduce dmaengine binding support

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Message-ID: <95f61847-2ec3-a4e0-d277-5d68836f66cf@linaro.org>
Date:   Wed, 10 May 2023 12:08:42 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     linux@...linux.org.uk, michal.simek@....com,
        radhey.shyam.pandey@....com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, anirudha.sarangi@....com,
        harini.katakam@....com, git@....com
Subject: Re: [PATCH net-next V3 1/3] dt-bindings: net: xilinx_axienet:
 Introduce dmaengine binding support

On 10/05/2023 10:50, Sarath Babu Naidu Gaddam wrote:
> From: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> 
> The axiethernet driver will use dmaengine framework to communicate
> with dma controller IP instead of built-in dma programming sequence.

Subject: drop second/last, redundant "bindings". The "dt-bindings"
prefix is already stating that these are bindings.

Actually also drop "dmaenging" as it is Linuxism. Focus on hardware,
e.g. "Add DMA support".

> 
> To request dma transmit and receive channels the axiethernet driver uses
> generic dmas, dma-names properties.
> 
> Also to support the backward compatibility, use "dmas" property to
> identify as it should use dmaengine framework or legacy
> driver(built-in dma programming).
> 
> At this point it is recommended to use dmaengine framework but it's
> optional. Once the solution is stable will make dmas as
> required properties.
> 
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> Signed-off-by: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
> ---
> These changes are on top of below txt to yaml conversion discussion
> https://lore.kernel.org/all/20230308061223.1358637-1-sarath.babu.naidu.gaddam@amd.com/#Z2e.:20230308061223.1358637-1-sarath.babu.naidu.gaddam::40amd.com:1bindings:net:xlnx::2caxi-ethernet.yaml
> 
> Changes in V3:
> 1) Reverted reg and interrupts property to  support backward compatibility.
> 2) Moved dmas and dma-names properties from Required properties.
> 
> Changes in V2:
> - None.
> ---
>  .../devicetree/bindings/net/xlnx,axi-ethernet.yaml   | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
> index 80843c177029..9dfa1976e260 100644
> --- a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
> +++ b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
> @@ -122,6 +122,16 @@ properties:
>        modes, where "pcs-handle" should be used to point to the PCS/PMA PHY,
>        and "phy-handle" should point to an external PHY if exists.
>  
> +  dmas:
> +    items:
> +      - description: TX DMA Channel phandle and DMA request line number
> +      - description: RX DMA Channel phandle and DMA request line number
> +
> +  dma-names:
> +    items:
> +      - const: tx_chan0

tx

> +      - const: rx_chan0

rx

Why doing these differently than all other devices?


Best regards,
Krzysztof