linux-kernel - RE: [RFC PATCH v3 00/16] DMA Engine support for AM33XX

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Date:	Mon, 5 Nov 2012 07:19:33 +0000
From:	"Hebbar, Gururaja" <gururaja.hebbar@...com>
To:	"Porter, Matt" <mporter@...com>
CC:	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Dan Williams <djbw@...com>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Tony Lindgren <tony@...mide.com>,
	"Nori, Sekhar" <nsekhar@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Cousson, Benoit" <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>
Subject: RE: [RFC PATCH v3 00/16] DMA Engine support for AM33XX

On Thu, Oct 18, 2012 at 18:56:39, Porter, Matt wrote:

...snip...
...snip...
...snip...

> 
> This series adds DMA Engine support for AM33xx, which uses
> an EDMA DMAC. The EDMA DMAC has been previously supported by only
> a private API implementation (much like the situation with OMAP
> DMA) found on the DaVinci family of SoCs.
> 
> The series applies on top of 3.7-rc1 and the following patches:
> 
> 	- GPMC fails to reserve memory fix:
> 	  http://www.spinics.net/lists/linux-omap/msg79675.html
> 	- TPS65910 regulator fix:
> 	  https://patchwork.kernel.org/patch/1593651/
> 	- dmaengine DT support from Vinod's dmaengine_dt branch in
> 	  git://git.infradead.org/users/vkoul/slave-dma.git since
> 	  027478851791df751176398be02a3b1c5f6aa824
> 
> The approach taken is similar to how OMAP DMA is being converted to
> DMA Engine support. With the functional EDMA private API already
> existing in mach-davinci/dma.c, we first move that to an ARM common
> area so it can be shared. Adding DT and runtime PM support to the
> private EDMA API implementation allows it to run on AM33xx. AM33xx
> *only* boots using DT so we leverage Jon's generic DT DMA helpers to
> register EDMA DMAC with the of_dma framework and then add support
> for calling the dma_request_slave_channel() API to both the mmc
> and spi drivers.
> 
> With this series both BeagleBone and the AM335x EVM have working
> MMC and SPI support.
> 
> This is tested on BeagleBone with a SPI framebuffer driver and MMC
> rootfs. A trivial gpio DMA event misc driver was used to test the
> crossbar DMA event support. It is also tested on the AM335x EVM
> with the onboard SPI flash and MMC rootfs. The branch at
> https://github.com/ohporter/linux/tree/edma-dmaengine-v3 has the
> complete series, dependencies, and some test drivers/defconfigs.
> 
> Regression testing was done on AM180x-EVM (which also makes use
> of the EDMA dmaengine driver and the EDMA private API) using SD,
> SPI flash, and the onboard audio supported by the ASoC Davinci
> driver.

Since you have tested MMC, and probably will be adding Audio support
for AM335x as well, I believe you will also be adding Pin-mux support
for both the modules.

Can you share your plan to release the next version? 
I have few patches pending for AM335x Audio (DT related). 

Thanks in advance

Regards
Gururaja

> 
> After this series, the plan is to convert the last in-tree user
> of the private EDMA API (davinci-pcm/mcasp) and then eliminate
> the private EDMA API by folding its functionality into
> drivers/dma/edma.c.
> 
> Matt Porter (16):
>   dmaengine: edma: fix slave config dependency on direction
>   ARM: davinci: move private EDMA API to arm/common
>   ARM: edma: remove unused transfer controller handlers
>   ARM: edma: add DT and runtime PM support for AM33XX
>   ARM: edma: add AM33XX crossbar event support
>   dmaengine: edma: enable build for AM33XX
>   dmaengine: edma: Add TI EDMA device tree binding
>   ARM: dts: add AM33XX EDMA support
>   dmaengine: add dma_request_slave_channel_compat()
>   mmc: omap_hsmmc: convert to dma_request_slave_channel_compat()
>   mmc: omap_hsmmc: limit max_segs with the EDMA DMAC
>   mmc: omap_hsmmc: add generic DMA request support to the DT binding
>   ARM: dts: add AM33XX MMC support
>   spi: omap2-mcspi: convert to dma_request_slave_channel_compat()
>   spi: omap2-mcspi: add generic DMA request support to the DT binding
>   ARM: dts: add AM33XX SPI support
> 
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