linux-kernel - Re: [PATCH 1/3] i2c: add DMA support for freescale i2c driver

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Message-Id: <201402281300.30907.marex@denx.de>
Date:	Fri, 28 Feb 2014 13:00:30 +0100
From:	Marek Vasut <marex@...x.de>
To:	Lothar Waßmann <LW@...o-electronics.de>
Cc:	Yao Yuan <yao.yuan@...escale.com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"wsa@...-dreams.de" <wsa@...-dreams.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] i2c: add DMA support for freescale i2c driver

On Friday, February 28, 2014 at 11:59:25 AM, Lothar Waßmann wrote:
> Hi,
> 
> Marek Vasut wrote:
> > On Friday, February 28, 2014 at 06:19:18 AM, Yao Yuan wrote:
> > 
> > [...]
> > 
> > > Yes, here have two dma channels, one for RX and the other one for TX.
> > > When we request the channel we should determine it for TX or RX.
> > 
> > Sorry, I don't quite understand this. If you have two DMA channels, can
> > you not use them both to do full-duplex SPI transfer ?
> 
> SPI != I2C

You got me, sorry.

Best regards,
Marek Vasut
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