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

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Message-ID: <20140228115925.5fe07693@ipc1.ka-ro>
Date:	Fri, 28 Feb 2014 11:59:25 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Marek Vasut <marex@...x.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

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


Lothar Waßmann
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