linux-kernel - Re: [PATCH 1/3] dt-bindings: k3dma: add optional property dma_min

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Date:   Thu, 28 Jun 2018 11:30:34 +0530
From:   Vinod <vkoul@...nel.org>
To:     Guodong Xu <guodong.xu@...aro.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, dan.j.williams@...el.com,
        liyu65@...ilicon.com, suzhuangluan@...ilicon.com,
        xuhongtao8@...ilicon.com, zhongkaihua@...wei.com,
        xuezhiliang@...ilicon.com, xupeng7@...wei.com,
        sunliang10@...wei.com, fengbaopeng@...ilicon.com,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: k3dma: add optional property
 dma_min_chan

On 22-06-18, 11:24, Guodong Xu wrote:
> From: Li Yu <liyu65@...ilicon.com>
> 
> Add optional property dma_min_chan for k3dma.
> 
> Signed-off-by: Li Yu <liyu65@...ilicon.com>
> ---
>  Documentation/devicetree/bindings/dma/k3dma.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/dma/k3dma.txt b/Documentation/devicetree/bindings/dma/k3dma.txt
> index 4945aeac4dc4..2fa1370c3173 100644
> --- a/Documentation/devicetree/bindings/dma/k3dma.txt
> +++ b/Documentation/devicetree/bindings/dma/k3dma.txt
> @@ -12,6 +12,11 @@ Required properties:
>  		have specific request line
>  - clocks: clock required
>  
> +Optional properties:
> +- dma_min_chan: the minimum number of DMA channel which begin to use
> +		the default value is 0, but in some platform is

Sorry I don't understand this property, we already have dma-channels
which describes the channels in a controller. What is purpose of this ?

> +		configured 1, like hi3660 platform
> +
>  Example:
>  
>  Controller:
> @@ -21,6 +26,7 @@ Controller:
>  			#dma-cells = <1>;
>  			dma-channels = <16>;
>  			dma-requests = <27>;
> +			dma_min_chan = <1>;
>  			interrupts = <0 12 4>;
>  			clocks = <&pclk>;
>  		};
> -- 
> 2.17.1

-- 
~Vinod