linux-kernel - Re: [PATCH 1/3] dt-bindings: i2c: mv64xxx: Document DMA properties

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Message-ID: <1c9cb6c2-2030-257d-a50d-dada0ab4449e@linaro.org>
Date:   Tue, 30 Aug 2022 12:36:31 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Samuel Holland <samuel@...lland.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Gregory CLEMENT <gregory.clement@...tlin.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/3] dt-bindings: i2c: mv64xxx: Document DMA properties

On 30/08/2022 05:08, Samuel Holland wrote:
> Allwinner's I2C offload engine includes bidirectional DMA support. Add
> the properties for describing this in the devicetree. "dmas" is optional
> because not all instances of the controller have their DRQs hooked up.
> For example, R_I2C0 and R_I2C1 on V536 have no DRQ number assigned.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Thank you for your patch. There is something to discuss/improve.

> ---
> 
>  .../bindings/i2c/marvell,mv64xxx-i2c.yaml           | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
> index 0ec033e48830..63d665a4f9bb 100644
> --- a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
> +++ b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
> @@ -66,6 +66,19 @@ properties:
>    resets:
>      maxItems: 1
>  
> +  dmas:
> +    items:
> +      - description: RX DMA Channel
> +      - description: TX DMA Channel
> +
> +  dma-names:
> +    items:
> +      - const: rx
> +      - const: tx
> +
> +dependencies:
> +  dmas: [ dma-names ]

Dependency is not needed. meta-schema has it.

Best regards,
Krzysztof