linux-kernel - RE: [PATCH v12 05/11] edma: config: Enable config options for EDMA

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Date:	Mon, 24 Jun 2013 21:09:58 +0000
From:	"Fernandes, Joel A" <joelagnel@...com>
To:	Arnd Bergmann <arnd@...db.de>,
	Joel A Fernandes <agnel.joel@...il.com>
CC:	"Nori, Sekhar" <nsekhar@...com>, Tony Lindgren <tony@...mide.com>,
	"Matt Porter" <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	"Rob Herring" <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"Mark Brown" <broonie@...nsource.wolfsonmicro.com>,
	"Cousson, Benoit" <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Koen Kooi <koen@...gleboard.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>
Subject: RE: [PATCH v12 05/11] edma: config: Enable config options for EDMA

> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Monday, June 24, 2013 4:08 PM
> To: Joel A Fernandes
> Cc: Nori, Sekhar; Fernandes, Joel A; Tony Lindgren; Matt Porter; Grant Likely;
> Rob Herring; Vinod Koul; Mark Brown; Cousson, Benoit; Russell King; Rob
> Landley; Andrew Morton; Jason Kridner; Koen Kooi; Devicetree Discuss; Linux
> OMAP List; Linux ARM Kernel List; Linux DaVinci Kernel List; Linux Kernel
> Mailing List; Linux Documentation List; Linux MMC List; Linux SPI Devel List
> Subject: Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA
> 
> On Monday 24 June 2013, Joel A Fernandes wrote:
> > >> Yes sure, right now they are defined  as follows in include/linux/edma.h:
> > >>
> > >> #if defined(CONFIG_TI_EDMA) || defined(CONFIG_TI_EDMA_MODULE)
> bool
> > >> edma_filter_fn(struct dma_chan *, void *); #else static inline bool
> > >> edma_filter_fn(struct dma_chan *chan, void *param) { return false;
> > >> } #endif
> > >
> > > It's best to just define the filter function in the platform code
> > > and pass a pointer to it through platform data. The way you do it
> > > above makes the slave drivers inherently nonportable.
> >
> > But with DT-only platforms, can you really do that?
> 
> The nice thing about this is that with a DT-only platform, the filter function will
> automatically go away: you have no platform_data, which means that if you
> are using dma_request_slave_channel_compat, you just pass NULL as the filter
> and the filter-data, same as just calling dma_request_slave_channel.
> 
 
[Joel] Ah yes! Thanks for that. Right, edma_filter_fn is not passed explicitly for DT case.

Thanks,
Joel
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