linux-kernel - Re: [PATCH v2 1/3] dt-bindings: dmaengine: Add dma-channel-mask to Tegra GPCDMA

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Date:   Fri, 23 Sep 2022 11:06:43 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Akhil R <akhilrajeev@...dia.com>, ldewangan@...dia.com,
        vkoul@...nel.org, thierry.reding@...il.com, p.zabel@...gutronix.de,
        dmaengine@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: dmaengine: Add dma-channel-mask to
 Tegra GPCDMA


On 19/09/2022 12:25, Akhil R wrote:
> Add dma-channel-mask property in Tegra GPCDMA document.
> 
> The property would help to specify the channels to be used in
> kernel and reserve few for the firmware. This was previously
> achieved by limiting the channel number to 31 in the driver.
> Now since we can list all 32 channels, update the interrupts
> property as well to list all 32 interrupts.
> 
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
> ---
>   .../devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml   | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> index 7e575296df0c..31724cda074e 100644
> --- a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> @@ -39,7 +39,7 @@ properties:
>         Should contain all of the per-channel DMA interrupts in
>         ascending order with respect to the DMA channel index.
>       minItems: 1
> -    maxItems: 31
> +    maxItems: 32
>   
>     resets:
>       maxItems: 1
> @@ -52,6 +52,9 @@ properties:
>   
>     dma-coherent: true
>   
> +  dma-channel-mask:
> +    maxItems: 1
> +
>   required:
>     - compatible
>     - reg
> @@ -60,6 +63,7 @@ required:
>     - reset-names
>     - "#dma-cells"
>     - iommus
> +  - dma-channel-mask
>   
>   additionalProperties: false
>   
> @@ -108,5 +112,6 @@ examples:
>           #dma-cells = <1>;
>           iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
>           dma-coherent;
> +        dma-channel-mask = <0xfffffffe>;
>       };
>   ...


Reviewed-by: Jon Hunter <jonathanh@...dia.com>

Thanks!
Jon

-- 
nvpublic