linux-kernel - Re: [PATCH 4/7] dmaengine: xilinx_vdma: Add Support for Xilinx AXI Direct Memory Access Engine

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Date:	Wed, 16 Mar 2016 08:47:21 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Kedareswara rao Appana <appana.durga.rao@...inx.com>
Cc:	dan.j.williams@...el.com, michal.simek@...inx.com,
	soren.brinkmann@...inx.com, appanad@...inx.com,
	moritz.fischer@...us.com, laurent.pinchart@...asonboard.com,
	luis@...ethencourt.com, anirudh@...inx.com,
	dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] dmaengine: xilinx_vdma: Add Support for Xilinx AXI
 Direct Memory Access Engine

On Tue, Mar 15, 2016 at 10:53:09PM +0530, Kedareswara rao Appana wrote:
> This patch updates the device-tree binding doc for
> adding support for AXI DMA.

Binding patch should precced the driver. and the title doesn't tell me its a
binding patch and might get ignore by folks.

Pls cc device tree ML on these patches. And please read
Documentation/devicetree/bindings/submitting-patches.txt. Its there for a
purpose

> 
> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> ---
>  .../devicetree/bindings/dma/xilinx/xilinx_vdma.txt | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> index e4c4d47..3d134a5 100644
> --- a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> @@ -3,8 +3,13 @@ It can be configured to have one channel or two channels. If configured
>  as two channels, one is to transmit to the video device and another is
>  to receive from the video device.
>  
> +Xilinx AXI DMA engine, it does transfers between memory and AXI4 stream
> +target devices. It can be configured to have one channel or two channels.
> +If configured as two channels, one is to transmit to the device and another
> +is to receive from the device.
> +
>  Required properties:
> -- compatible: Should be "xlnx,axi-vdma-1.00.a"
> +- compatible: Should be "xlnx,axi-vdma-1.00.a" or "xlnx,axi-dma-1.00.a"
>  - #dma-cells: Should be <1>, see "dmas" property below
>  - reg: Should contain VDMA registers location and length.
>  - xlnx,num-fstores: Should be the number of framebuffers as configured in h/w.
> @@ -55,6 +60,21 @@ axi_vdma_0: axivdma@...30000 {
>  	} ;
>  } ;
>  
> +axi_dma_0: axidma@...00000 {
> +	compatible = "xlnx,axi-dma-1.00.a";
> +	#dma_cells = <1>;
> +	reg = < 0x40400000 0x10000 >;
> +	dma-channel@...00000 {
> +		compatible = "xlnx,axi-vdma-mm2s-channel";
> +		interrupts = < 0 59 4 >;
> +		xlnx,datawidth = <0x40>;
> +	} ;
> +	dma-channel@...00030 {
> +		compatible = "xlnx,axi-vdma-s2mm-channel";
> +		interrupts = < 0 58 4 >;
> +		xlnx,datawidth = <0x40>;
> +	} ;
> +} ;
>  
>  * DMA client
>  
> -- 
> 2.1.2
> 

-- 
~Vinod