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 unreadable > 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 > drivers/misc/carma/carma-fpga-program.c > > 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 > file. > > 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? -- ~Vinod -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
