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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: M'boumba Cedric Madianga
	<cedric.madianga-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	Maxime Coquelin
	<mcoquelin.stm32-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	pawel.moll-5wv7dgnIgG8@public.gmane.org,
	mark.rutland-5wv7dgnIgG8@public.gmane.org,
	ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
	vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 1/4] dt-bindings: Document the STM32 DMA bindings
Date: Thu, 08 Oct 2015 22:40:19 +0200	[thread overview]
Message-ID: <11583587.xphxbMQ7TN@wuerfel> (raw)
In-Reply-To: <CAOAejn0x68GaEEfTZbsi5VSJt+Um-bV2Mcmc2pxUwh5QjD=ZYw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Thursday 08 October 2015 22:25:50 M'boumba Cedric Madianga wrote:
> >
> > How do you know which channels are available for memory-to-memory
> > transfers?
> For memory-to-memory transfer we don't need any channel/request combination.
> We look for any available channel in the channel list to execute our transfer.
> So, as often as possible, we expect that a peripheral release his
> channel after transfering data.
> In that way, we always should have at least one channel available for
> that kind of transfer.
> 

Ah, got it. So the use of virtual channels in this driver makes MEM2MEM
transfers work, but is otherwise not required.

Thanks for the clarification.

	Arnd
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  parent reply	other threads:[~2015-10-08 20:40 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-08 15:20 [PATCH 0/4] Add support for STM32 DMA M'boumba Cedric Madianga
2015-10-08 15:20 ` [PATCH 1/4] dt-bindings: Document the STM32 DMA bindings M'boumba Cedric Madianga
2015-10-08 15:43   ` Arnd Bergmann
2015-10-08 16:01     ` M'boumba Cedric Madianga
     [not found]       ` <CAOAejn0y+6uFbho3iv37xh6=zKevnp_6MxOEw4e9Oc4U2x_csQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-08 19:26         ` Arnd Bergmann
2015-10-08 20:25           ` M'boumba Cedric Madianga
     [not found]             ` <CAOAejn0x68GaEEfTZbsi5VSJt+Um-bV2Mcmc2pxUwh5QjD=ZYw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-08 20:40               ` Arnd Bergmann [this message]
2015-10-12 19:16   ` Maxime Coquelin
2015-10-08 15:20 ` [PATCH 2/4] dmaengine: Add STM32 DMA driver M'boumba Cedric Madianga
     [not found]   ` <1444317612-818-3-git-send-email-cedric.madianga-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-12 20:09     ` Maxime Coquelin
2015-10-13 11:25       ` M'boumba Cedric Madianga
     [not found]         ` <CAOAejn2rX2f7YM-JYeJv98JbPwg1Uir_30abVg1XSTKNjUHVSA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-13 11:50           ` M'boumba Cedric Madianga
2015-10-08 15:20 ` [PATCH 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU M'boumba Cedric Madianga
2015-10-08 15:20 ` [PATCH 4/4] ARM: configs: Add STM32 DMA support in STM32 defconfig M'boumba Cedric Madianga
2015-10-12 20:11   ` Maxime Coquelin

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