From: swarren@wwwdotorg•org (Stephen Warren)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] of: Add generic device tree DMA helpers
Date: Mon, 19 Mar 2012 10:54:01 -0600 [thread overview]
Message-ID: <4F6764A9.8090907@wwwdotorg.org> (raw)
In-Reply-To: <201203191545.40933.arnd@arndb.de>
On 03/19/2012 09:45 AM, Arnd Bergmann wrote:
> On Monday 19 March 2012, Stephen Warren wrote:
>>> Maybe one can use named properties in a new device node in that case,
>>> like this:
>>>
>>> bus {
>>> dma: dma-controller {
>>> #dma-cells = <1>;
>>> };
>>>
>>> device {
>>> compatible = "device";
>>> channel: dma-channel {
>>> type = <0x1>;
>>> name = "foo";
>>> number = <23>;
>>> direction = <3>;
>>> };
>>> dma-requests = <&dma &channel>;
>>> };
>>> };
>>
>> For reference, this is very similar to how the pinctrl bindings work,
>> except that they require the "channel" node to be a child of the DMA
>> controller, and hence "dma-requests" doesn't contain <&dma &channel>,
>> just <&channel>, since "dma" is the parent (or grand-parent) of "channel".
>
> Right, but the difference beytween the pinctrl binding and what I
> describe here is that the channel description would be part of the
> dma engine driver specific binding, not the generic binding that
> is visible to device drivers.
That's actually true for pinctrl as well: Common pinctrl bindings cover
the content/format of "dma-requests" and a requirement for a
"dma-channel" node, whereas the per-pin-controller bindings define the
content of node "dma-channel".
next prev parent reply other threads:[~2012-03-19 16:54 UTC|newest]
Thread overview: 80+ 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 18:13 ` Stephen Warren
2012-01-27 20:36 ` Cousson, Benoit
2012-01-28 18:12 ` Grant Likely
2012-01-28 18:06 ` Grant Likely
2012-01-31 21:26 ` Cousson, Benoit
2012-02-02 4:52 ` Grant Likely
2012-01-31 23:09 ` Russell King - ARM Linux
2012-02-01 10:50 ` Cousson, Benoit
2012-02-02 8:45 ` Russell King - ARM Linux
2012-02-02 8:54 ` Cousson, Benoit
2012-02-22 10:59 ` Nicolas Ferre
2012-02-23 10:03 ` Cousson, Benoit
2012-02-23 15:51 ` Nicolas Ferre
2012-02-23 15:57 ` Cousson, Benoit
2012-02-27 13:09 ` Nicolas Ferre
2012-02-27 14:22 ` Cousson, Benoit
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 20:54 ` Stephen Warren
2012-03-05 13:14 ` Cousson, Benoit
2012-03-05 18:30 ` Stephen Warren
2012-03-05 19:57 ` Russell King - ARM Linux
2012-03-05 10:55 ` Cousson, Benoit
2012-03-05 15:36 ` Grant Likely
2012-03-14 17:47 ` Nicolas Ferre
2012-03-14 18:16 ` Stephen Warren
2012-03-15 8:38 ` [PATCH] of: Add generic device tree DMA helpers Nicolas Ferre
2012-03-15 9:22 ` Arnd Bergmann
2012-03-15 9:26 ` Russell King - ARM Linux
2012-03-15 10:09 ` Arnd Bergmann
2012-03-17 9:42 ` Grant Likely
2012-03-17 16:03 ` Arnd Bergmann
2012-03-18 9:08 ` Grant Likely
2012-03-15 10:27 ` Thierry Reding
2012-03-17 10:47 ` Grant Likely
2012-03-18 9:22 ` Thierry Reding
2012-03-18 15:10 ` Arnd Bergmann
2012-03-18 18:22 ` Grant Likely
2012-03-19 13:02 ` Mark Brown
2012-03-19 15:01 ` Arnd Bergmann
2012-03-19 15:07 ` Stephen Warren
2012-03-19 15:45 ` Arnd Bergmann
2012-03-19 16:54 ` Stephen Warren [this message]
2012-03-15 16:30 ` Cousson, Benoit
2012-03-15 19:57 ` Russell King - ARM Linux
2012-03-15 20:41 ` Arnd Bergmann
2012-03-15 21:39 ` Cousson, Benoit
2012-03-15 21:55 ` Russell King - ARM Linux
2012-03-16 9:56 ` Arnd Bergmann
2012-03-20 14:02 ` Matt Porter
2012-03-15 23:45 ` Nicolas Pitre
2012-03-16 10:03 ` Arnd Bergmann
2012-03-16 11:19 ` Cousson, Benoit
2012-03-16 12:04 ` Arnd Bergmann
2012-03-16 13:28 ` Cousson, Benoit
2012-03-16 13:36 ` Nicolas Ferre
2012-03-17 9:40 ` Grant Likely
2012-03-18 20:13 ` Arnd Bergmann
2012-03-18 20:44 ` Grant Likely
2012-03-18 21:58 ` Arnd Bergmann
2012-03-18 22:12 ` Arnd Bergmann
2012-03-19 13:37 ` Nicolas Ferre
2012-03-19 15:20 ` Russell King - ARM Linux
2012-03-19 15:58 ` Cousson, Benoit
2012-03-19 13:30 ` Nicolas Ferre
2012-03-19 14:06 ` Arnd Bergmann
2012-03-19 15:33 ` Russell King - ARM Linux
2012-03-19 16:11 ` Arnd Bergmann
2012-03-19 18:06 ` Jassi Brar
2012-03-19 16:31 ` Nicolas Ferre
2012-03-19 17:49 ` Cousson, Benoit
2012-03-19 14:45 ` Grant Likely
2012-03-20 14:54 ` Nicolas Ferre
2012-03-20 10:13 ` [PATCH v2 1/2] " 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 14:16 ` Grant Likely
2012-03-20 10:17 ` [PATCH] of: dma/fixup Nicolas Ferre
2012-03-20 13:03 ` [PATCH v2 1/2] of: Add generic device tree DMA helpers Arnd Bergmann
2012-03-20 15:38 ` Stephen Warren
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