linux-kernel - Re: [PATCHv9] dmaengine: Add support for BCM2835

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Message-Id: <201401051952.07355.arnd@arndb.de>
Date:	Sun, 5 Jan 2014 19:52:07 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Florian Meier <florian.meier@...lo.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	devicetree <devicetree@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"Lars-Peter Clausen" <lars@...afoo.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	"linux-rpi-kernel" <linux-rpi-kernel@...ts.infradead.org>,
	dmaengine <dmaengine@...r.kernel.org>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCHv9] dmaengine: Add support for BCM2835

On Sunday 05 January 2014, Florian Meier wrote:
> On 05.01.2014 15:06, Arnd Bergmann wrote:
> >>
> >> Sigh, the API is developing faster than I can keep track with updating
> >> this patch. I hope some day I will be faster....
> >> When Russell told me about the second one before, it hoped that I can
> >> avoid merging different trees on my own, but it seems that you want me
> >> to do that ;-)
> >
> > The dma_get_any_slave_channel() change is probably my fault. I suggested
> > both the initial dma_get_slave_channel() API and this one because the
> > original approach turned out too complicated. If dma_set_mask_and_coherent().
> >
> > I don't think you have to merge other trees, to get both APIs, they should
> > already be part of the dma-slave tree that your patch would get merged
> > into. If not, we can probably come up with a different solution. The
> > dma_set_mask_and_coherent() suggestion is not as important as the
> > dma_get_any_slave_channel() one, if you have to choose between them.
> 
> Both changes are in the slave-dma tree, but I need patches from the
> bcm2835 tree and the asoc tree, too. Although, it shouldn't be too
> complicated to merge them, I hope.

Why do you need the bcm2835 and asoc changes? The addition of the
dmaengine driver should be self-contained as far as I can tell,
except that the audio driver won't work unless both are merged.

This wouldn't be considered a strict dependency since you are not
breaking anything that used to work prior to the patches, and you
don't create a kernel version that doesn't build. Note that this
would be different if you had a dependency on a platform_data
definition.

	Arnd
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