From: Arnd Bergmann <arnd@arndb.de>
To: Scott Wood <scottwood@freescale.com>
Cc: linuxppc-dev@ozlabs.org, Timur Tabi <timur@freescale.com>
Subject: Re: ucc_uart: add support for Freescale QUICCEngine UART
Date: Wed, 5 Dec 2007 00:39:38 +0100 [thread overview]
Message-ID: <200712050039.39153.arnd@arndb.de> (raw)
In-Reply-To: <4755E3A6.80704@freescale.com>
On Wednesday 05 December 2007, Scott Wood wrote:
>
> > You can argue that the QS is really a DMA device, but in that case you
> > should convert the driver to use the DMA mapping interfaces correctly,
> > which I would consider overkill.
>
> Why is it overkill?
>
Well, if the QE can never be used with an IOMMU anyway, you don't
lose any functionality by considering it a physical address instead of
a DMA address.
The DMA mapping API is meant for the cases where physical and dma
addresses can be different in the first place.
Arnd <><
next prev parent reply other threads:[~2007-12-04 23:39 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-04 17:51 ucc_uart: add support for Freescale QUICCEngine UART Timur Tabi
2007-12-04 22:13 ` Arnd Bergmann
2007-12-04 22:33 ` Timur Tabi
[not found] ` <200712050037.11489.arnd@arndb.de>
2007-12-05 17:06 ` Timur Tabi
2007-12-04 22:39 ` Timur Tabi
2007-12-04 23:26 ` Arnd Bergmann
2007-12-04 23:32 ` Scott Wood
2007-12-04 23:39 ` Arnd Bergmann [this message]
2007-12-04 23:44 ` Scott Wood
2007-12-04 23:47 ` Timur Tabi
2007-12-04 23:56 ` Arnd Bergmann
2007-12-05 0:59 ` Vitaly Bordug
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