linux-kernel - Re: [RFC PATCH 10/13] spi: omap2-mcspi: dma_request_slave

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Message-ID: <20121001163723.GN5641@beef>
Date:	Mon, 1 Oct 2012 12:37:24 -0400
From:	Matt Porter <mporter@...com>
To:	Vinod Koul <vinod.koul@...ux.intel.com>
Cc:	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Chris Ball <cjb@...top.org>,
	Russell King <linux@....linux.org.uk>,
	Benoit Cousson <b-cousson@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Landley <rob@...dley.net>, 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>
Subject: Re: [RFC PATCH 10/13] spi: omap2-mcspi: dma_request_slave_channel()
 support for DT platforms

On Thu, Sep 27, 2012 at 03:06:34PM +0530, Vinod Koul wrote:
> On Fri, 2012-09-21 at 14:37 -0400, Matt Porter wrote:
> > On Fri, Sep 21, 2012 at 08:42:47AM -0700, Tony Lindgren wrote:
> > > 
> > > Can't we come up with a version of dma_request_slave_channel that works
> > > both ways for now:
> > > 
> > > 	mcspi_dma->dma_rx =
> > > 		dma_request_slave_channel_compat(mask, omap_dma_filter_fn, &sig,
> > > 					&master->dev, mcspi_dma->dma_rx_ch_name);
> > > 	...			
> > > 
> > > Then it's just question of patching away two lines later on rather than
> > > having to add all this if else to all the drivers first, then patching
> > > it away again.
> > 
> > I think that something like that is workable with the implementation
> > simply checking for of_node to do the right thing.
> Yes, I think it would be better to have common API but underneath two
> implementations in transitional phase.

Ok, I'll implement something for discussion in the v2 series.

-Matt
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