linux-kernel - Re: [PATCH v2 5/6] Documentation: DT: vdma: update binding doc for AXI CDMA

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Message-ID: <20160327192742.GJ19212@xsjsorenbubuntu>
Date:	Sun, 27 Mar 2016 12:27:42 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Kedareswara rao Appana <appana.durga.rao@...inx.com>
CC:	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<michal.simek@...inx.com>, <vinod.koul@...el.com>,
	<dan.j.williams@...el.com>, <anuragku@...inx.com>,
	<appanad@...inx.com>, <moritz.fischer@...us.com>,
	<laurent.pinchart@...asonboard.com>, <luis@...ethencourt.com>,
	<svemula@...inx.com>, <anirudh@...inx.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <dmaengine@...r.kernel.org>
Subject: Re: [PATCH v2 5/6] Documentation: DT: vdma: update binding doc for
 AXI CDMA

On Sun, 2016-03-27 at 23:36:06 +0530, Kedareswara rao Appana wrote:
> This patch updates the device-tree binding doc for
> adding support for AXI CDMA.
> 
> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> ---
> ---> Modified commit message as suggested by Vinod.
> ---> Moved the patch to forward in the series as suggested by vinod.
> 
>  .../devicetree/bindings/dma/xilinx/xilinx_vdma.txt     | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> index 5841421..2b0c12b 100644
> --- a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> @@ -8,8 +8,12 @@ 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.
>  
> +Xilinx AXI CDMA engine, it does transfers between memory-mapped source
> +address and a memory-mapped destination address.
> +
>  Required properties:
> -- compatible: Should be "xlnx,axi-vdma-1.00.a" or "xlnx,axi-dma-1.00.a"
> +- compatible: Should be "xlnx,axi-vdma-1.00.a" or "xlnx,axi-dma-1.00.a" or
> +	      "xlnx,axi-cdma-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.
> @@ -80,6 +84,18 @@ axi_dma_0: axidma@...00000 {
>  	} ;
>  } ;
>  
> +axi_cdma_0: axicdma@...00000 {
> +       compatible = "xlnx,axi-cdma-1.00.a";
> +       #dma-cells = <1>;
> +       reg = < 0x7e200000 0x10000 >;
> +       xlnx,addrwidth = <0x20>;
> +       dma-channel@...00000 {
> +               compatible = "xlnx,axi-dma-mm2s-channel";
> +               interrupts = < 0 55 4 >;
> +               xlnx,datawidth = <0x40>;
> +       } ;
> +} ;

As in the other patch, the node name should be 'dma-controller@...' and
the inconsistend spacing could be fixed.

Also, it seems this adds pretty much identical examples that just differ
in the compat string. Is that really needed?

	Sören