linux-kernel - Re: [PATCH v4 00/14] DMA Engine support for AM33XX

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Message-Id: <201301112012.45981.arnd@arndb.de>
Date:	Fri, 11 Jan 2013 20:12:45 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Matt Porter <mporter@...com>
Cc:	Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <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>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Dan Williams <djbw@...com>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v4 00/14] DMA Engine support for AM33XX

On Friday 11 January 2013, Matt Porter wrote:
> We have tightly coupled the link-time dependency for
> omap_dma_filter_fn by going down the path of using
> dma_request_slave_channel_compat() as Tony suggested to avoid extra
> ifdefry.
> 
> That dependency will go away naturally if all the "legacy" OMAP platforms
> were required to only boot from DT...just as a newly added SoCs are.
> 
> Are you suggesting unwinding the _compat() approach?

No, I was thinking we could define omap_dma_filter_fn to NULL
for the DT-only case.

	Arnd
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