linux-kernel - Re: [PATCH v5 1/3] dt-bindings: dmaengine: Add dmamux for CV18XX/SG200X series SoC

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Date: Tue, 26 Mar 2024 07:57:44 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Inochi Amaoto <inochiama@...look.com>, Vinod Koul <vkoul@...nel.org>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Chen Wang <unicorn_wang@...look.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: Jisheng Zhang <jszhang@...nel.org>, Liu Gui <kenneth.liu@...hgo.com>,
 Jingbao Qiu <qiujingbao.dlmu@...il.com>, dlan@...too.org,
 dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v5 1/3] dt-bindings: dmaengine: Add dmamux for
 CV18XX/SG200X series SoC

On 26/03/2024 02:47, Inochi Amaoto wrote:
> The DMA IP of Sophgo CV18XX/SG200X is based on a DW AXI CORE, with
> an additional channel remap register located in the top system control
> area. The DMA channel is exclusive to each core.
> 
> Add the dmamux binding for CV18XX/SG200X series SoC
> 


> +
> +allOf:
> +  - $ref: dma-router.yaml#
> +
> +properties:
> +  compatible:
> +    const: sophgo,cv1800-dmamux
> +
> +  reg:
> +    items:
> +      - description: DMA channal remapping register
> +      - description: DMA channel interrupt mapping register
> +
> +  '#dma-cells':
> +    const: 2
> +    description:
> +      The first cells is device id. The second one is the cpu id.
> +
> +  dma-masters:
> +    maxItems: 1
> +
> +  dma-requests:
> +    const: 8

If this is const, why do you need it in the DTS in the first place?
compatible defines it.

> +
> +required:
> +  - '#dma-cells'
> +  - dma-masters
> +


I don't understand what happened here. Previously you had a child and I
proposed to properly describe it with $ref.

Now, all children are gone. Binding is supposed to be complete. Based on
your cover letter, this is not complete, but why? What is missing and
why it cannot be added?


> +additionalProperties: false
> +
> +examples:
> +  - |
> +    dma-router {
> +      compatible = "sophgo,cv1800-dmamux";
> +      #dma-cells = <2>;
> +      dma-masters = <&dmac>;
> +      dma-requests = <8>;
> +    };
> diff --git a/include/dt-bindings/dma/cv1800-dma.h b/include/dt-bindings/dma/cv1800-dma.h
> new file mode 100644
> index 000000000000..3ce9dac25259
> --- /dev/null
> +++ b/include/dt-bindings/dma/cv1800-dma.h

Filename should match bindings filename.


Anyway, the problem is that it is a dead header. I don't see it being
used, so it is not a binding.



Best regards,
Krzysztof