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

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Message-ID: <CAFd313xntHx7JhfTWSsJo+bTm-DuEcbAzqXt9in1s0irL3g7sw@mail.gmail.com>
Date:	Thu, 30 Jul 2015 14:21:07 +0530
From:	Rameshwar Sahu <rsahu@....com>
To:	Arnd Bergmann <arnd@...db.de>
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

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.


>
>         Arnd
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