linux-kernel - Re: [PATCH] atmel_spi: support zero length transfer

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Message-Id: <200802211026.17816.marc.pignat@hevs.ch>
Date:	Thu, 21 Feb 2008 10:26:16 +0100
From:	Marc Pignat <marc.pignat@...s.ch>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	hskinnemoen@...el.com, david-b@...bell.net,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] atmel_spi: support zero length transfer

Hi!

On Thursday 21 February 2008, Atsushi Nemoto wrote:
...
> Yes.  I tested it on AT91SAM9260 and it seems ENDRX rises soon.
> Though it can be possible to avoid starting DMA for zero length
> transfer, I think it is not worth to optimize for such a rare case.
Ok, verified to work on at91rm9200, should be tested on AVR32.

David, do you think writing 0 bytes is a valid use of this API?
IMHO, we should add a fied to the spi_transfer struct.

Regards

Marc

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