Re: [PATCH v4] dma: Add Xilinx AXI Direct Memory Access Engine driver support
From: Vinod Koul
Date: Fri Feb 20 2015 - 01:32:40 EST
On Sat, Feb 14, 2015 at 02:21:52PM +0000, Appana Durga Kedareswara Rao wrote:
> Hi Vinod,
> > -----Original Message-----
> > From: Vinod Koul [mailto:vinod.koul@xxxxxxxxx]
> > Sent: Thursday, February 12, 2015 3:05 PM
> > To: Appana Durga Kedareswara Rao
> > Cc: Arnd Bergmann; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> > devicetree@xxxxxxxxxxxxxxx; Srikanth Vemula; linux-
> > kernel@xxxxxxxxxxxxxxx; Srikanth Thokala; dmaengine@xxxxxxxxxxxxxxx;
> > robh+dt@xxxxxxxxxx; Michal Simek; Anirudha Sarangi;
> > grant.likely@xxxxxxxxxx; dan.j.williams@xxxxxxxxx
> > Subject: Re: [PATCH v4] dma: Add Xilinx AXI Direct Memory Access Engine
> > driver support
> > On Thu, Jan 29, 2015 at 11:24:41AM +0000, Appana Durga Kedareswara Rao
> > wrote:
> > > > Earlier in the driver we are embedding dma_slave_config into custom
> > > > structs But Lars suggested to modify it. please refer to the below
> > > > thread for more details.
> > > > http://www.spinics.net/lists/dmaengine/msg00010.html
> > > >
> > > > And later we thought of creating a separate private member in
> > > > dma_slave_config for sharing additional configuration between slave
> > > > device and dma engine Or a new dma_ctrl_cmd like
> > > >
> > FSLDMA_EXTERNAL_START(http://www.kernelhub.org/?msg=405535&p=2 )
> > > >
> > > > Finally Vinod was ok with the existing suggestion so we dropped the
> > > > above thought.
> > > >
> > > > @Vinod : Could you please comment on this.
> > FSLDMA_EXTERNAL_START has been removed, and you cna use the removal
> > as a guidance of how to solve your issue
Please limit you mailer to set wrap at 80 chars, otherwise it becomes
> The current VDMA driver that got merged in the open source and the
> current patch (dma: xilinx dma v4) Srikanth T submitted both contains the
> Similar implementation that you pointed as above(I mean similar to the
> free scale dma driver).
> The discussion starts here is why we need the header file(Xilinx_dma.h) in
> the include/linux/amba/Xilinx_dma.h folder.
> Like for FSL DMA it is got defined (fsl_dma_external_start) as a function
> prototype in include/linux/fsldma.h And it is being getting used in the
> Similarly in the Xilinx VDMA driver(xilinx_vdma_channel_set_config )
> defined as a function prototype in the include/linux/amba/xilinx_dma.h And
> is being used by Xilinx videos drivers. Those video driver need to use
> the (xilinx_vdma_channel_set_config) which requires this global header
> Could you please suggest us whether that header file (Xilinx_dma.h) should
> be there in include/linux/amba or we should move it to include/linux?
> And any functional comments for this v4 patch?
Let me ask you a question, what is the relation of xilinx_dma with amba?
If none then only include/linux/ seems to be the right choice. If not then
amba maybe okay but you need to provide justfication why it should be in amba?
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