From: Mark Brown <broonie@kernel.org>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Jean-Francois Moine <moinejf@free.fr>,
alsa-devel@alsa-project.org, Takashi Iwai <tiwai@suse.de>,
linux-kernel@vger.kernel.org, Liam Girdwood <lgirdwood@gmail.com>,
Rob Herring <rob.herring@calxeda.com>,
devicetree-discuss@vger.kernel.org
Subject: Re: [PATCH] ARM: kirkwood: extend the kirkwood pcm/dma driver for DT usage
Date: Tue, 23 Jul 2013 14:29:48 +0100 [thread overview]
Message-ID: <20130723132948.GF9858@sirena.org.uk> (raw)
In-Reply-To: <20130723132314.GU24642@n2100.arm.linux.org.uk>
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On Tue, Jul 23, 2013 at 02:23:14PM +0100, Russell King - ARM Linux wrote:
> On Tue, Jul 23, 2013 at 01:57:56PM +0100, Mark Brown wrote:
> > This device has no registers or other hardware - this looks like a stub
> > device which shouldn't be visible in DT but should instead be created by
> > the I2S driver - look at how most of the other DT platforms using
> > dmaengine work.
> There is no separate DMA engine on this platform. dmaengine is totally
> irrelevant to this hardware.
The pattern for instantiating a DMA controller that's integrated into
the DAI is the same as that where the DMA controller is a shared IP
accessed via dmaengine so it's still useful to look at these platforms
to see how to do the instnatiation.
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WARNING: multiple messages have this Message-ID (diff)
From: Mark Brown <broonie@kernel.org>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Jean-Francois Moine <moinejf@free.fr>,
Liam Girdwood <lgirdwood@gmail.com>,
Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>,
Rob Herring <rob.herring@calxeda.com>,
alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
devicetree-discuss@vger.kernel.org
Subject: Re: [PATCH] ARM: kirkwood: extend the kirkwood pcm/dma driver for DT usage
Date: Tue, 23 Jul 2013 14:29:48 +0100 [thread overview]
Message-ID: <20130723132948.GF9858@sirena.org.uk> (raw)
In-Reply-To: <20130723132314.GU24642@n2100.arm.linux.org.uk>
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On Tue, Jul 23, 2013 at 02:23:14PM +0100, Russell King - ARM Linux wrote:
> On Tue, Jul 23, 2013 at 01:57:56PM +0100, Mark Brown wrote:
> > This device has no registers or other hardware - this looks like a stub
> > device which shouldn't be visible in DT but should instead be created by
> > the I2S driver - look at how most of the other DT platforms using
> > dmaengine work.
> There is no separate DMA engine on this platform. dmaengine is totally
> irrelevant to this hardware.
The pattern for instantiating a DMA controller that's integrated into
the DAI is the same as that where the DMA controller is a shared IP
accessed via dmaengine so it's still useful to look at these platforms
to see how to do the instnatiation.
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next prev parent reply other threads:[~2013-07-23 13:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-23 8:46 [PATCH] ARM: kirkwood: extend the kirkwood pcm/dma driver for DT usage Jean-Francois Moine
2013-07-23 12:57 ` Mark Brown
2013-07-23 13:23 ` Russell King - ARM Linux
2013-07-23 13:23 ` Russell King - ARM Linux
2013-07-23 13:29 ` Mark Brown [this message]
2013-07-23 13:29 ` Mark Brown
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