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Date: Tue, 19 Aug 2014 20:27:34 +0530 From: Vinod Koul <vinod.koul@...el.com> To: Russell King - ARM Linux <linux@....linux.org.uk>, Dan Williams <dan.j.williams@...el.com> Cc: Ludovic Desroches <ludovic.desroches@...el.com>, Maxime Ripard <maxime.ripard@...e-electrons.com>, Dan Williams <dan.j.williams@...el.com>, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Antoine Ténart <antoine@...e-electrons.com>, Thomas Petazzoni <thomas@...e-electrons.com>, Alexandre Belloni <alexandre.belloni@...e-electrons.com>, Boris Brezillon <boris@...e-electrons.com>, Matt Porter <matt.porter@...aro.org>, laurent.pinchart@...asonboard.com, Gregory Clement <gregory.clement@...e-electrons.com>, Nicolas Ferre <nicolas.ferre@...el.com> Subject: Re: [PATCH] Documentation: dmaengine: Add a documentation for the dma controller API On Tue, Aug 19, 2014 at 03:44:23PM +0100, Russell King - ARM Linux wrote: > On Tue, Aug 19, 2014 at 07:15:07PM +0530, Vinod Koul wrote: > > On Thu, Aug 14, 2014 at 09:57:53AM +0100, Russell King - ARM Linux wrote: > > > It's got something to do with the async engine API, and seems to be > > > something to do with whether a descriptor can have other transactions > > > added to it, and whether a descriptor can be re-used (async-tx engines > > > typically allocate a fixed set of descriptors and recycle them.) > > Yes this is my understanding too. Async API IIUC can reuse descriptors and > > if engine doesnt support this is a way to tell them please do use that. > > > > For slave dmanegine API we need to ignore it. > > We shouldn't ignore it - ignoring it makes it harder to implement a DMA > engine driver which supports both the slave and async APIs, because > we then need to know the reason for the channel being requested. Do you have such usage coming up near future :) > > Ignoring it until it can be understood and documented is an approach I > would agree with though. Certainly, I am asking Dan to add more clarity on these bits to help improve. -- ~Vinod -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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