From: Arnd Bergmann <arnd@arndb.de>
To: "M'boumba Cedric Madianga" <cedric.madianga@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, Kumar Gala <galak@codeaurora.org>,
linux@arm.linux.org.uk, vinod.koul@intel.com,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
dmaengine@vger.kernel.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@mail.gmail.com>
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
next prev parent reply other threads:[~2015-10-08 20:41 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
2015-10-08 19:26 ` Arnd Bergmann
2015-10-08 20:25 ` M'boumba Cedric Madianga
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
2015-10-12 20:09 ` Maxime Coquelin
2015-10-13 11:25 ` M'boumba Cedric Madianga
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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