From: Matt Porter <mporter@ti.com>
To: "Cousson, Benoit" <b-cousson@ti.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
linux-arm-kernel@lists.infradead.org,
Nicolas Ferre <nicolas.ferre@atmel.com>,
grant.likely@secretlab.ca, rob.herring@calxeda.com,
devicetree-discuss@lists.ozlabs.org,
Stephen Warren <swarren@nvidia.com>,
linux-omap@vger.kernel.org,
Thierry Reding <thierry.reding@avionic-design.de>
Subject: Re: [PATCH] of: Add generic device tree DMA helpers
Date: Tue, 20 Mar 2012 10:02:13 -0400 [thread overview]
Message-ID: <20120320140213.GG14084@beef> (raw)
In-Reply-To: <4F626180.2010902@ti.com>
On Thu, Mar 15, 2012 at 10:39:12PM +0100, Cousson, Benoit wrote:
> On 3/15/2012 9:41 PM, Arnd Bergmann wrote:
> >The numbers definitely need to become local to each of the controllers, but
> >that is the case pretty much automatically using the proposed binding,
> >because each dma request identifier starts with the phandle of the
> >controller.
>
> Indeed, and in the case of the OMAP SDMA controller, it can handle
> up to 127 DMA request lines numbered from 0 to 126... So a local
> number seems to be a good representation... especially for a number.
> I'm not sure to understand the issue with this binding.
>
> And AFAIK, there is the only one general purpose DMA controller in
> OMAP so far. The other ones are private to some IPs like MMC or USB,
> so they do not need necessarily need any DT representation.
AM335x has an EDMA controller instead of SDMA. This is the same EDMA
found on mach-davinci/ parts.
-Matt
WARNING: multiple messages have this Message-ID (diff)
From: mporter@ti.com (Matt Porter)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] of: Add generic device tree DMA helpers
Date: Tue, 20 Mar 2012 10:02:13 -0400 [thread overview]
Message-ID: <20120320140213.GG14084@beef> (raw)
In-Reply-To: <4F626180.2010902@ti.com>
On Thu, Mar 15, 2012 at 10:39:12PM +0100, Cousson, Benoit wrote:
> On 3/15/2012 9:41 PM, Arnd Bergmann wrote:
> >The numbers definitely need to become local to each of the controllers, but
> >that is the case pretty much automatically using the proposed binding,
> >because each dma request identifier starts with the phandle of the
> >controller.
>
> Indeed, and in the case of the OMAP SDMA controller, it can handle
> up to 127 DMA request lines numbered from 0 to 126... So a local
> number seems to be a good representation... especially for a number.
> I'm not sure to understand the issue with this binding.
>
> And AFAIK, there is the only one general purpose DMA controller in
> OMAP so far. The other ones are private to some IPs like MMC or USB,
> so they do not need necessarily need any DT representation.
AM335x has an EDMA controller instead of SDMA. This is the same EDMA
found on mach-davinci/ parts.
-Matt
next prev parent reply other threads:[~2012-03-20 14:01 UTC|newest]
Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-27 17:29 [RFC PATCH 1/2] of: Add generic device tree DMA helpers Cousson, Benoit
2012-01-27 17:29 ` Cousson, Benoit
2012-01-27 18:13 ` Stephen Warren
2012-01-27 18:13 ` Stephen Warren
2012-01-27 20:36 ` Cousson, Benoit
2012-01-27 20:36 ` Cousson, Benoit
2012-01-28 18:12 ` Grant Likely
2012-01-28 18:12 ` Grant Likely
2012-01-28 18:06 ` Grant Likely
2012-01-28 18:06 ` Grant Likely
2012-01-31 21:26 ` Cousson, Benoit
2012-01-31 21:26 ` Cousson, Benoit
2012-02-02 4:52 ` Grant Likely
2012-02-02 4:52 ` Grant Likely
2012-01-31 23:09 ` Russell King - ARM Linux
2012-01-31 23:09 ` Russell King - ARM Linux
2012-02-01 10:50 ` Cousson, Benoit
2012-02-01 10:50 ` Cousson, Benoit
[not found] ` <4F2918F6.9040100-l0cyMroinI0@public.gmane.org>
2012-02-02 8:45 ` Russell King - ARM Linux
2012-02-02 8:45 ` Russell King - ARM Linux
[not found] ` <20120202084539.GC1275-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-02-02 8:54 ` Cousson, Benoit
2012-02-02 8:54 ` Cousson, Benoit
2012-02-22 10:59 ` Nicolas Ferre
2012-02-22 10:59 ` Nicolas Ferre
2012-02-23 10:03 ` Cousson, Benoit
2012-02-23 10:03 ` Cousson, Benoit
2012-02-23 15:51 ` Nicolas Ferre
2012-02-23 15:51 ` Nicolas Ferre
2012-02-23 15:57 ` Cousson, Benoit
2012-02-23 15:57 ` Cousson, Benoit
[not found] ` <4F4661DE.90704-l0cyMroinI0@public.gmane.org>
2012-02-27 13:09 ` Nicolas Ferre
2012-02-27 13:09 ` Nicolas Ferre
2012-02-27 14:22 ` Cousson, Benoit
2012-02-27 14:22 ` Cousson, Benoit
2012-02-27 17:28 ` Nicolas Ferre
2012-02-27 17:28 ` Nicolas Ferre
2012-02-29 14:54 ` [RFC PATCH] of: DMA helpers: manage generic requests specification Nicolas Ferre
2012-02-29 14:54 ` Nicolas Ferre
2012-02-29 20:54 ` Stephen Warren
2012-02-29 20:54 ` Stephen Warren
2012-03-05 13:14 ` Cousson, Benoit
2012-03-05 13:14 ` Cousson, Benoit
2012-03-05 18:30 ` Stephen Warren
2012-03-05 18:30 ` Stephen Warren
2012-03-05 19:57 ` Russell King - ARM Linux
2012-03-05 19:57 ` Russell King - ARM Linux
2012-03-05 10:55 ` Cousson, Benoit
2012-03-05 10:55 ` Cousson, Benoit
2012-03-05 15:36 ` Grant Likely
2012-03-05 15:36 ` Grant Likely
2012-03-14 17:47 ` Nicolas Ferre
2012-03-14 17:47 ` Nicolas Ferre
2012-03-14 18:16 ` Stephen Warren
2012-03-14 18:16 ` Stephen Warren
[not found] ` <4F22DEF2.5000807-l0cyMroinI0@public.gmane.org>
2012-03-15 8:38 ` [PATCH] of: Add generic device tree DMA helpers Nicolas Ferre
2012-03-15 8:38 ` Nicolas Ferre
2012-03-15 9:22 ` Arnd Bergmann
2012-03-15 9:22 ` Arnd Bergmann
2012-03-15 9:26 ` Russell King - ARM Linux
2012-03-15 9:26 ` Russell King - ARM Linux
2012-03-15 10:09 ` Arnd Bergmann
2012-03-15 10:09 ` Arnd Bergmann
2012-03-17 9:42 ` Grant Likely
2012-03-17 9:42 ` Grant Likely
2012-03-17 16:03 ` Arnd Bergmann
2012-03-17 16:03 ` Arnd Bergmann
2012-03-18 9:08 ` Grant Likely
2012-03-18 9:08 ` Grant Likely
2012-03-15 10:27 ` Thierry Reding
2012-03-15 10:27 ` Thierry Reding
2012-03-17 10:47 ` Grant Likely
2012-03-17 10:47 ` Grant Likely
2012-03-18 9:22 ` Thierry Reding
2012-03-18 9:22 ` Thierry Reding
2012-03-18 15:10 ` Arnd Bergmann
2012-03-18 15:10 ` Arnd Bergmann
2012-03-18 18:22 ` Grant Likely
2012-03-18 18:22 ` Grant Likely
2012-03-19 13:02 ` Mark Brown
2012-03-19 13:02 ` Mark Brown
2012-03-19 15:01 ` Arnd Bergmann
2012-03-19 15:01 ` Arnd Bergmann
2012-03-19 15:07 ` Stephen Warren
2012-03-19 15:07 ` Stephen Warren
2012-03-19 15:45 ` Arnd Bergmann
2012-03-19 15:45 ` Arnd Bergmann
[not found] ` <201203191545.40933.arnd-r2nGTMty4D4@public.gmane.org>
2012-03-19 16:54 ` Stephen Warren
2012-03-19 16:54 ` Stephen Warren
2012-03-15 16:30 ` Cousson, Benoit
2012-03-15 16:30 ` Cousson, Benoit
2012-03-15 19:57 ` Russell King - ARM Linux
2012-03-15 19:57 ` Russell King - ARM Linux
[not found] ` <20120315195753.GA2842-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-03-15 20:41 ` Arnd Bergmann
2012-03-15 20:41 ` Arnd Bergmann
2012-03-15 21:39 ` Cousson, Benoit
2012-03-15 21:39 ` Cousson, Benoit
2012-03-15 21:55 ` Russell King - ARM Linux
2012-03-15 21:55 ` Russell King - ARM Linux
2012-03-16 9:56 ` Arnd Bergmann
2012-03-16 9:56 ` Arnd Bergmann
2012-03-20 14:02 ` Matt Porter [this message]
2012-03-20 14:02 ` Matt Porter
2012-03-15 23:45 ` Nicolas Pitre
2012-03-15 23:45 ` Nicolas Pitre
2012-03-16 10:03 ` Arnd Bergmann
2012-03-16 10:03 ` Arnd Bergmann
2012-03-16 11:19 ` Cousson, Benoit
2012-03-16 11:19 ` Cousson, Benoit
2012-03-16 12:04 ` Arnd Bergmann
2012-03-16 12:04 ` Arnd Bergmann
2012-03-16 13:28 ` Cousson, Benoit
2012-03-16 13:28 ` Cousson, Benoit
2012-03-16 13:36 ` Nicolas Ferre
2012-03-16 13:36 ` Nicolas Ferre
2012-03-17 9:40 ` Grant Likely
2012-03-17 9:40 ` Grant Likely
2012-03-18 20:13 ` Arnd Bergmann
2012-03-18 20:13 ` Arnd Bergmann
2012-03-18 20:44 ` Grant Likely
2012-03-18 20:44 ` Grant Likely
2012-03-18 21:58 ` Arnd Bergmann
2012-03-18 21:58 ` Arnd Bergmann
2012-03-18 22:12 ` Arnd Bergmann
2012-03-18 22:12 ` Arnd Bergmann
2012-03-19 13:37 ` Nicolas Ferre
2012-03-19 13:37 ` Nicolas Ferre
2012-03-19 15:20 ` Russell King - ARM Linux
2012-03-19 15:20 ` Russell King - ARM Linux
2012-03-19 15:58 ` Cousson, Benoit
2012-03-19 15:58 ` Cousson, Benoit
2012-03-19 13:30 ` Nicolas Ferre
2012-03-19 13:30 ` Nicolas Ferre
2012-03-19 14:06 ` Arnd Bergmann
2012-03-19 14:06 ` Arnd Bergmann
2012-03-19 15:33 ` Russell King - ARM Linux
2012-03-19 15:33 ` Russell King - ARM Linux
2012-03-19 16:11 ` Arnd Bergmann
2012-03-19 16:11 ` Arnd Bergmann
2012-03-19 18:06 ` Jassi Brar
2012-03-19 18:06 ` Jassi Brar
2012-03-19 16:31 ` Nicolas Ferre
2012-03-19 16:31 ` Nicolas Ferre
2012-03-19 17:49 ` Cousson, Benoit
2012-03-19 17:49 ` Cousson, Benoit
2012-03-19 14:45 ` Grant Likely
2012-03-19 14:45 ` Grant Likely
2012-03-20 14:54 ` Nicolas Ferre
2012-03-20 14:54 ` Nicolas Ferre
2012-03-20 10:13 ` [PATCH v2 1/2] " Nicolas Ferre
2012-03-20 10:13 ` Nicolas Ferre
2012-03-20 10:13 ` [PATCH 2/2] of: selftest/dma: Add selftest for new DT DMA request helpers Nicolas Ferre
2012-03-20 10:13 ` Nicolas Ferre
2012-03-20 14:16 ` Grant Likely
2012-03-20 14:16 ` Grant Likely
2012-03-20 10:17 ` [PATCH] of: dma/fixup Nicolas Ferre
2012-03-20 10:17 ` Nicolas Ferre
[not found] ` <6b5dc1fadfd03a48093338b6981c0a7ae7662212.1332237596.git.nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
2012-03-20 13:03 ` [PATCH v2 1/2] of: Add generic device tree DMA helpers Arnd Bergmann
2012-03-20 13:03 ` Arnd Bergmann
2012-03-20 15:38 ` Stephen Warren
2012-03-20 15:38 ` Stephen Warren
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