linux-kernel - Re: [PATCH] dmaengine: xgene-dma: Add ACPI support for X-Gene DMA engine driver

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Date:	Sat, 01 Aug 2015 23:28:19 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Rameshwar Sahu <rsahu@....com>
Cc:	Vinod Koul <vinod.koul@...el.com>, dan.j.williams@...el.com,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	jcm@...hat.com, patches@....com
Subject: Re: [PATCH] dmaengine: xgene-dma: Add ACPI support for X-Gene DMA engine driver

On Thursday 30 July 2015 14:21:07 Rameshwar Sahu wrote:
> Hi Arnd,
> 
> On Wed, Jul 29, 2015 at 8:04 PM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Tuesday 21 July 2015 18:44:39 Rameshwar Prasad Sahu wrote:
> >> This patch adds ACPI support for the APM X-Gene DMA engine driver.
> >>
> >> Signed-off-by: Rameshwar Prasad Sahu <rsahu@....com>
> >>
> >
> > How does a slave driver refer to a channel in case of ACPI?
> 
> We don't support slave dma here. This driver supports only memcp, xor,
> pq, scatter-gather offloading, so,
> client driver can use linux dmaengine APIs like dma_request_channel()
> etc to request channel.

Ok, makes sense. Thanks!

	Arnd
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