linux-kernel - Re: DMA_ENGINE: can't use it without selecting a dma engine driver

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Date:	Wed, 17 Jun 2009 18:12:04 +0300
From:	Dragos Tatulea <dtatulea@...acom.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	Octavian Purdila <opurdila@...acom.com>
Subject: Re: DMA_ENGINE: can't use it without selecting a dma engine driver

Hi,

> >
> >        Just discovered that it's impossible to select the dma engine
> > without compiling a dma engine driver from the kernel. What if I want to
> > use a different dma engine?
> >
> 
> Create a Kconfig entry for your driver in drivers/dma/Kconfig and have
> it "select DMA_ENGINE".
That's what I want to avoid. The dma engine driver is out of tree.

What is the rationale behind this? It seems (to me) impossible to have all
such drivers in upstream.

Thanks,
Dragos
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