linux-kernel - Re: [PATCH v8 0/2] Add support for the Allwinner A31 DMA Controller

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Date:	Wed, 21 May 2014 18:04:43 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	andriy.shevchenko@...el.com, Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, zhuzhenhua@...winnertech.com,
	shuge@...winnertech.com, linux-sunxi@...glegroups.com,
	kevin.z.m.zh@...il.com, sunny@...winnertech.com,
	dmaengine@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH v8 0/2] Add support for the Allwinner A31 DMA Controller

On Wednesday 21 May 2014 17:55:51 Maxime Ripard wrote:
> On Wed, May 21, 2014 at 05:23:41PM +0200, Arnd Bergmann wrote:
> > On Wednesday 21 May 2014 17:15:54 Maxime Ripard wrote:
> > > Changes from v7:
> > >   - select DMA_OF, since we're only relying on DT
> > > 
> > 
> > I missed the discussion about this issue, but it seems wrong to me.
> > DMA_OF is currently enabled if we have both DMAENGINE and OF turned on.
> > 
> > If OF is disabled but DMA_OF gets selected by DMA_SUN6I, what happens?
> 
> Is that even possible with a multiplatform-based platform?

It's not possible for ARCH_SUNXI or any other that depends on
ARCH_MULTIPLATFORM. I just noticed that you have 'depends on ARCH_SUNXI',
so the 'select DMA_OF' statement is just redundant, not wrong.

However, if the driver was 'depends on ARCH_SUNXI || COMPILE_TEST' as many
others are nowadays, it would be a bug.

	Arnd
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