linux-kernel - RE: [PATCH 5/7] dmaengine: xilinx_vdma: Remove unnecessary axi dma device-tree binding doc

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Message-ID: <C246CAC1457055469EF09E3A7AC4E11A4A56D2B1@XAP-PVEXMBX01.xlnx.xilinx.com>
Date:	Wed, 16 Mar 2016 06:08:53 +0000
From:	Appana Durga Kedareswara Rao <appana.durga.rao@...inx.com>
To:	Moritz Fischer <moritz.fischer@...us.com>
CC:	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Michal Simek <michals@...inx.com>,
	Soren Brinkmann <sorenb@...inx.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Luis de Bethencourt <luis@...ethencourt.com>,
	Anirudha Sarangi <anirudh@...inx.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 5/7] dmaengine: xilinx_vdma: Remove unnecessary axi dma
 device-tree binding doc

Hi Moritz,


> -----Original Message-----
> From: Moritz Fischer [mailto:moritz.fischer@...us.com]
> Sent: Wednesday, March 16, 2016 7:04 AM
> To: Appana Durga Kedareswara Rao
> Cc: Dan Williams; Vinod Koul; Michal Simek; Soren Brinkmann; Appana Durga
> Kedareswara Rao; Laurent Pinchart; Luis de Bethencourt; Anirudha Sarangi;
> dmaengine@...r.kernel.org; linux-arm-kernel; Linux Kernel Mailing List
> Subject: Re: [PATCH 5/7] dmaengine: xilinx_vdma: Remove unnecessary axi dma
> device-tree binding doc
> 
> Hi there,
> 
> On Tue, Mar 15, 2016 at 10:23 AM, Kedareswara rao Appana
> <appana.durga.rao@...inx.com> wrote:
> > AXI DMA support is added to the existing AXI VDMA driver.
> > The binding doc for AXI DMA should also be updated in the VDMA
> > device-tree binding doc.
> >
> > Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> > ---
> >  .../devicetree/bindings/dma/xilinx/xilinx_dma.txt  | 65
> > ----------------------
> >  1 file changed, 65 deletions(-)
> >  delete mode 100644
> > Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> >
> > diff --git
> > a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> > b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> > deleted file mode 100644
> > index 2291c40..0000000
> > --- a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> > +++ /dev/null
> > @@ -1,65 +0,0 @@
> > -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-dma-1.00.a"
> > -- #dma-cells: Should be <1>, see "dmas" property below
> > -- reg: Should contain DMA registers location and length.
> > -- dma-channel child node: Should have atleast one channel and can have upto
> > -       two channels per device. This node specifies the properties of each
> > -       DMA channel (see child node properties below).
> 
> at least vs atleast, up to vs upto.
> > -
> > -Optional properties:
> > -- xlnx,include-sg: Tells whether configured for Scatter-mode in
> > -       the hardware.
> 
> How about: 'If present, hardware supports scatter-gather mode'

I am deleting this binding doc as AXI DMA IP support is being added to the 
Existing VDMA driver.

Will fix your comments in the vdma device-tree binding doc.

Regards,
Kedar.

> > -
> > -Required child node properties:
> > -- compatible: It should be either "xlnx,axi-dma-mm2s-channel" or
> > -       "xlnx,axi-dma-s2mm-channel".
> > -- interrupts: Should contain per channel DMA interrupts.
> > -- xlnx,datawidth: Should contain the stream data width, take values
> > -       {32,64...1024}.
> > -
> > -Option child node properties:
> > -- xlnx,include-dre: Tells whether hardware is configured for Data
> > -       Realignment Engine.
> 
> How about: 'If present, hardware supports Data Realignment Engine'
> 
> > -
> > -Example:
> > -++++++++
> > -
> > -axi_dma_0: axidma@...00000 {
> > -       compatible = "xlnx,axi-dma-1.00.a";
> > -       #dma_cells = <1>;
> 
> I think you meant #dma-cells = <1>; here. That caught me while testing ;-)
> 
> Cheers,
> 
> Moritz