From: Scott Wood <scottwood@freescale•com>
To: Mark Rutland <mark.rutland@arm•com>
Cc: "devicetree@vger•kernel.org" <devicetree@vger•kernel.org>,
"ian.campbell@citrix•com" <ian.campbell@citrix•com>,
Pawel Moll <Pawel.Moll@arm•com>,
"swarren@wwwdotorg•org" <swarren@wwwdotorg•org>,
Hongbo Zhang <hongbo.zhang@freescale•com>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
"rob.herring@calxeda•com" <rob.herring@calxeda•com>,
"vinod.koul@intel•com" <vinod.koul@intel•com>,
"djbw@fb•com" <djbw@fb•com>,
"linuxppc-dev@lists•ozlabs.org" <linuxppc-dev@lists•ozlabs.org>
Subject: Re: [PATCH v9 2/3] DMA: Freescale: Add new 8-channel DMA engine device tree nodes
Date: Mon, 16 Sep 2013 17:46:30 -0500 [thread overview]
Message-ID: <1379371590.2536.187.camel@snotra.buserror.net> (raw)
In-Reply-To: <20130912171541.GH22013@e106331-lin.cambridge.arm.com>
On Thu, 2013-09-12 at 18:15 +0100, Mark Rutland wrote:
> On Tue, Sep 03, 2013 at 10:01:50AM +0100, Hongbo Zhang wrote:
> > On 09/02/2013 11:58 PM, Mark Rutland wrote:
> > > May some channels be unusable for some reason, or will all eight
> > > channels be wired on any given Elo3 DMA?
> > Sorry, not get your point clearly, maybe you are clear now because of my
> > previous explanations.
>
> I assume that on any El03 DMA, there won't be a case where you can't
> describe the channel at 0x80, for instance. It will always be present
> (but it might not be wired up to anything any therefore be useful)?
>
> This was related to my concerns about the status register description --
> if the channels at 0x0,0x80,0x100,0x180 weren't wired, what would get
> described in the dt? I guess that would never actually happen because
> all 8 channels must always be present in the Elo3 IP block.
If a channel is not usable for whatever reason (other than that "used
for a different fixed purpose and thus described with a different
compatible" thing that was mentioned earlier in these threads), wouldn't
it just have status = "disabled" or similar, or be absent?
-Scott
next prev parent reply other threads:[~2013-09-16 22:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-30 11:26 [PATCH v9 0/3] DMA: Freescale: Add support for 8-channel DMA engine hongbo.zhang
2013-08-30 11:26 ` [PATCH v9 1/3] DMA: Freescale: revise device tree binding document hongbo.zhang
2013-08-30 11:26 ` [PATCH v9 2/3] DMA: Freescale: Add new 8-channel DMA engine device tree nodes hongbo.zhang
[not found] ` <20130902155636.GA18206@e106331-lin.cambridge.arm.com>
2013-09-03 9:01 ` Hongbo Zhang
2013-09-10 6:00 ` Hongbo Zhang
2013-09-12 17:15 ` Mark Rutland
2013-09-16 10:25 ` Hongbo Zhang
2013-09-16 22:46 ` Scott Wood [this message]
2013-08-30 11:26 ` [PATCH v9 3/3] DMA: Freescale: update driver to support 8-channel DMA engine hongbo.zhang
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