linux-kernel - Re: [PATCH 1/2] dt-bindings: dma: Support channel page to nvidia,tegra210-adma

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Message-ID: <aa7eef93-6948-453c-8eb8-d7f4f7572808@kernel.org>
Date: Thu, 5 Dec 2024 16:15:27 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Mohan Kumar D <mkumard@...dia.com>, vkoul@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org
Cc: thierry.reding@...il.com, jonathanh@...dia.com, spujar@...dia.com,
 dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
 linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: dma: Support channel page to
 nvidia,tegra210-adma

On 05/12/2024 15:58, Mohan Kumar D wrote:
> Multiple ADMA Channel page hardware support has been added from
> TEGRA186 and onwards. Update the DT binding to use any of the
> ADMA channel page address space region.
> 
> Signed-off-by: Mohan Kumar D <mkumard@...dia.com>
> ---
>  .../bindings/dma/nvidia,tegra210-adma.yaml    | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml
> index 877147e95ecc..8c76c98560c5 100644
> --- a/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml
> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml
> @@ -29,7 +29,24 @@ properties:
>            - const: nvidia,tegra186-adma
>  
>    reg:
> -    maxItems: 1
> +    description: |

Do not need '|' unless you need to preserve formatting.

> +     The 'page' region describes the address space of the page
> +     used for accessing the DMA channel registers. The 'global'
> +     region describes the address space of the global DMA registers.
> +     In the absence of the 'reg-names' property, there must be a
> +     single entry that covers the address space of the global DMA
> +     registers and the DMA channel registers.

Rather oneOf listing the items with description.

> +     minItems: 1
> +     maxItems: 2
> +
> +  reg-names:
> +    oneOf:
> +      - enum:
> +          - page
> +          - global

This is not correct. You said it covers both.


You also need allOf:if:then: block restricting it per each variant/device.



Best regards,
Krzysztof