linux-kernel - Re: [PATCH v1] ARM: dts: imx6dl: disable dma support for spi on i.mx6dl

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Date:	Wed, 10 Sep 2014 11:21:30 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Robin Gong <b38343@...escale.com>
CC:	<kernel@...gutronix.de>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<Frank.Li@...escale.com>
Subject: Re: [PATCH v1] ARM: dts: imx6dl: disable dma support for spi on
 i.mx6dl

On Wed, Sep 10, 2014 at 09:33:36AM +0800, Robin Gong wrote:
> There is one weird data in rxfifo after one full rx/tx transfer
> done sometimes. It looks a design issue and hard to workaround
> totally, so disable dma functhion here. And will re-enable it
> once the root cause found.
> 
> Signed-off-by: Robin Gong <b38343@...escale.com>
> ---
>  arch/arm/boot/dts/imx6dl.dtsi | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx6dl.dtsi b/arch/arm/boot/dts/imx6dl.dtsi
> index b453e0e..e84a1ff 100644
> --- a/arch/arm/boot/dts/imx6dl.dtsi
> +++ b/arch/arm/boot/dts/imx6dl.dtsi
> @@ -102,6 +102,22 @@
>  	};
>  };
>  
> +&ecspi1 {
> +	dma-names = "", "";
> +};
> +
> +&ecspi2 {
> +	dma-names = "", "";
> +};
> +
> +&ecspi3 {
> +	dma-names = "", "";
> +};
> +
> +&ecspi4 {
> +	dma-names = "", "";
> +};
> +

This looks odd.  Can we drop the dma properties from imx6qdl.dtsi,
and only add them in imx6q.dtsi instead?

Shawn

>  &hdmi {
>  	compatible = "fsl,imx6dl-hdmi";
>  };
> -- 
> 1.9.1
> 
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