linux-kernel - Re: [PATCH v2 1/7] dmaengine: of

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Date:	Thu, 26 Mar 2015 14:11:38 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	<tony@...mide.com>, <linux@....linux.org.uk>,
	<grant.likely@...aro.org>, <dmaengine@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <robh+dt@...nel.org>,
	<nm@...com>
Subject: Re: [PATCH v2 1/7] dmaengine: of_dma: Support for DMA routers

On 03/26/2015 12:50 PM, Vinod Koul wrote:
> On Wed, Mar 11, 2015 at 03:23:24PM +0200, Peter Ujfalusi wrote:
>> DMA routers are transparent devices used to mux DMA requests from
>> peripherals to DMA controllers. They are used when the SoC integrates more
>> devices with DMA requests then their controller can handle.
>> DRA7x is one example of such SoC, where the sDMA can hanlde 128 DMA request
>> lines, but in SoC level it has 205 DMA requests.
>>
>> The of_dma_router will be registered as of_dma_controller with special
>> xlate function and additional parameters and the code will translate and
>> requests a DMA channel from the real DMA controller.
>> This way the router can be transparent for the system while remaining generic
>> enough to be used in different environments.
>>
> Looks fine, was expecting a Documentation updates as well, but that can come
> as follow up patch too

I have added the DT binding document since this series adds support for
routers for platforms booting with DT:

Documentation/devicetree/bindings/dma/dma.txt | 28 ++++++++

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