From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: at91: dt: dma usage
Date: Wed, 17 Dec 2014 22:49:55 +0100 [thread overview]
Message-ID: <2831487.RTCyiHWGfY@wuerfel> (raw)
In-Reply-To: <20141217201622.GE4885@piout.net>
On Wednesday 17 December 2014 21:16:22 Alexandre Belloni wrote:
> On 22/10/2014 at 10:53:43 +0200, Ji?? Prchal wrote :
> > in fact that in at91sam chips has a lot of peripherals but only 2*8 dma channels
> > and as my patch in last week "at91: sam9x5 dt: add usart dma definitions to dt"
> > adds only dma definitions, not make to use them, leave it on board definition,
> > shouldn't do the same all other peripherals definitions?
> > I think that I2C, SPI are not as necessary as USART, but thous are always "on".
>
> Not much discussion happened on that and I have the feeling this is
> something we have to sort out. Until the dma driver are able to allocate
> channels dynamically, it is true that this may be something we shouldn't
> enable in the dtsi and let people activate dma in the board dts.
Could you use the drivers/dma/virt-dma.c infrastructure in the driver
to do this? Are you already planning to use it?
Arnd
next prev parent reply other threads:[~2014-12-17 21:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-13 9:02 [PATCH] at91: sam9x5 dt: add usart dma definitions to dt Jiri Prchal
2014-10-14 12:24 ` Ludovic Desroches
2014-10-21 16:38 ` Nicolas Ferre
[not found] ` <54477097.1050909@aksignal.cz>
2014-12-17 20:16 ` at91: dt: dma usage Alexandre Belloni
2014-12-17 21:49 ` Arnd Bergmann [this message]
2015-01-09 15:42 ` Ludovic Desroches
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