linux-kernel - Re: [PATCH 2/8 v2] Documentation: bindings: k3dma: Add binding for dma-avail-chan

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Message-ID: <20190105040030.GF2477@Mani-XPS-13-9360>
Date:   Sat, 5 Jan 2019 09:30:30 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>, Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tanglei Han <hantanglei@...wei.com>,
        Zhuangluan Su <suzhuangluan@...ilicon.com>,
        Ryan Grachek <ryan@...ted.us>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/8 v2] Documentation: bindings: k3dma: Add binding for
 dma-avail-chan

Hi John,

On Fri, Jan 04, 2019 at 12:56:22PM -0800, John Stultz wrote:
> Some dma channels can be reserved for secure mode or other
> hardware on the SoC, so provide a binding for a bitmask
> listing the available channels for the kernel to use.
> 
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Tanglei Han <hantanglei@...wei.com>
> Cc: Zhuangluan Su <suzhuangluan@...ilicon.com>
> Cc: Ryan Grachek <ryan@...ted.us>
> Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Cc: dmaengine@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  Documentation/devicetree/bindings/dma/k3dma.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/dma/k3dma.txt b/Documentation/devicetree/bindings/dma/k3dma.txt
> index 10a2f15..1c466c1 100644
> --- a/Documentation/devicetree/bindings/dma/k3dma.txt
> +++ b/Documentation/devicetree/bindings/dma/k3dma.txt
> @@ -14,6 +14,9 @@ Required properties:
>  		have specific request line
>  - clocks: clock required
>  
> +Optional properties:
> +- dma-avail-chan: Bitmask of available physical channels
> +

This property looks too generic. Since this is specific to HiSi SoCs,
this could be "hisi-dma-avail-chan"?

Thanks,
Mani

>  Example:
>  
>  Controller:
> -- 
> 2.7.4
>