From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-db8lp0188.outbound.messaging.microsoft.com ([213.199.154.188] helo=db8outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VEVL3-0004Yv-Md for linux-mtd@lists.infradead.org; Wed, 28 Aug 2013 02:18:31 +0000 Message-ID: <521D5E20.5030007@freescale.com> Date: Wed, 28 Aug 2013 10:19:12 +0800 From: Huang Shijie MIME-Version: 1.0 To: Vikram Narayanan Subject: Re: [PATCH V2 2/4] mtd: gpmi: use DMA channel 0 for all the nand chips References: <1377595747-21033-1-git-send-email-b32955@freescale.com> <1377595747-21033-3-git-send-email-b32955@freescale.com> <521CDC55.60602@gmail.com> In-Reply-To: <521CDC55.60602@gmail.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: quoted-printable Cc: linux-mtd@lists.infradead.org, computersforpeace@gmail.com, dwmw2@infradead.org, dedekind1@gmail.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , =E4=BA=8E 2013=E5=B9=B408=E6=9C=8828=E6=97=A5 01:05, Vikram Narayanan =E5= =86=99=E9=81=93: > IIRC, We have 4 DMA channels. Don't we?=20 yes, we have. But we only have one gpmi. I ever tried to use different dma channels for different chip selects. But after discussed with our IC guy, it is proved to be meaningless. We only have one gpmi, and so we only have one data bus. Even we have 4=20 dma channels , we have to do the DMA operations one by one. thanks Huang Shijie