From: maxime.ripard@free-electrons.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v8 0/2] Add support for the Allwinner A31 DMA Controller
Date: Thu, 22 May 2014 13:58:05 +0200 [thread overview]
Message-ID: <20140522115805.GC27329@lukather> (raw)
In-Reply-To: <5291281.0OW8pVdbhQ@wuerfel>
On Wed, May 21, 2014 at 06:04:43PM +0200, Arnd Bergmann wrote:
> 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.
Ah, yes, I forgot about COMPILE_TEST.
I'll change this to remove the select, and add a dependency on
COMPILE_TEST.
Thanks,
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
andriy.shevchenko@intel.com, Vinod Koul <vinod.koul@intel.com>,
linux-kernel@vger.kernel.org, zhuzhenhua@allwinnertech.com,
shuge@allwinnertech.com, linux-sunxi@googlegroups.com,
kevin.z.m.zh@gmail.com, sunny@allwinnertech.com,
dmaengine@vger.kernel.org,
Dan Williams <dan.j.williams@intel.com>
Subject: Re: [PATCH v8 0/2] Add support for the Allwinner A31 DMA Controller
Date: Thu, 22 May 2014 13:58:05 +0200 [thread overview]
Message-ID: <20140522115805.GC27329@lukather> (raw)
In-Reply-To: <5291281.0OW8pVdbhQ@wuerfel>
[-- Attachment #1: Type: text/plain, Size: 1256 bytes --]
On Wed, May 21, 2014 at 06:04:43PM +0200, Arnd Bergmann wrote:
> 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.
Ah, yes, I forgot about COMPILE_TEST.
I'll change this to remove the select, and add a dependency on
COMPILE_TEST.
Thanks,
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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next prev parent reply other threads:[~2014-05-22 11:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-21 15:15 [PATCH v8 0/2] Add support for the Allwinner A31 DMA Controller Maxime Ripard
2014-05-21 15:15 ` Maxime Ripard
2014-05-21 15:15 ` [PATCH v8 1/2] Documentation: dt: Add Allwinner A31 DMA controller bindings Maxime Ripard
2014-05-21 15:15 ` Maxime Ripard
2014-05-21 15:15 ` [PATCH v8 2/2] dmaengine: sun6i: Add driver for the Allwinner A31 DMA controller Maxime Ripard
2014-05-21 15:15 ` Maxime Ripard
2014-05-21 15:23 ` [PATCH v8 0/2] Add support for the Allwinner A31 DMA Controller Arnd Bergmann
2014-05-21 15:23 ` Arnd Bergmann
2014-05-21 15:55 ` Maxime Ripard
2014-05-21 15:55 ` Maxime Ripard
2014-05-21 16:04 ` Arnd Bergmann
2014-05-21 16:04 ` Arnd Bergmann
2014-05-22 11:58 ` Maxime Ripard [this message]
2014-05-22 11:58 ` Maxime Ripard
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