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Date: Mon, 22 Apr 2013 16:54:37 +0200 From: Arnd Bergmann <arnd@...db.de> To: "Lars-Peter Clausen" <lars@...afoo.de> Cc: Vinod Koul <vinod.koul@...el.com>, Jon Hunter <jon-hunter@...com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] dma: of: Remove restriction that #dma-cells can't be 0 On Monday 22 April 2013, Lars-Peter Clausen wrote: > > On 04/22/2013 02:38 PM, Arnd Bergmann wrote: > > On Monday 22 April 2013, Lars-Peter Clausen wrote: > >> > >> There is no sensible reason why #dma-cells shouldn't be allowed to be 0. It is > >> completely up to the DMA controller how many additional parameters, besides the > >> phandle, it needs to identify a channel. E.g. for DMA controller with only one > >> channel or for DMA controllers which don't have a restriction on which channel > >> can be used for which peripheral it completely legitimate to not require any > >> additional parameters. > >> > >> Also fixes the following warning: > >> drivers/dma/of-dma.c: In function 'of_dma_controller_register': > >> drivers/dma/of-dma.c:67:7: warning: 'nbcells' may be used uninitialized in this function > >> > >> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de> > > > > Do you have an example for this? If a dma engine has only one request line, > > why would you even use the dmaengine subsystem for it, rather than including > > the code to program it in the slave driver? > > Why wouldn't I use the dmaengine subsystem for a DMA controller? In my > particular case different instances of the same DMA core will be used with > different DMA slaves. And the DMA slaves can also have different DMA master > cores, depending on the system. Right, that makes sense. Acked-by: Arnd Bergmann <arnd@...db.de> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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