From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ivan Kuten <ivan.kuten-NihHnkIkDZhBDgjK7y7TUQ@public.gmane.org>
Subject: Re: problem with converting from at91_spi to
 atmel_spi (AT91RM9200)
Date: Thu, 24 May 2007 21:24:09 +0300
Message-ID: <20070524212409.7ee555d8@newbox>
References: <20070523143456.15fc49ab@newbox>
	<200705230906.13353.david-b@pacbell.net>
	<20070524133646.62bbc386@dhcp-255-175.norway.atmel.com>
	<200705240931.43663.david-b@pacbell.net>
	<4655C956.8080300@billgatliff.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Cc: David Brownell <david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>,
	spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
	Nicolas Ferre <nicolas.ferre-XEyKDsrmbOsS+FvcfC7Uqw@public.gmane.org>,
	Haavard Skinnemoen <hskinnemoen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>, andrew-eS41wJS13H5l57MIdRCFDg@public.gmane.org
To: Bill Gatliff <bgat-uPd5UNENI//N9NzbbXoYwQ@public.gmane.org>
Return-path: <spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
In-Reply-To: <4655C956.8080300-uPd5UNENI//N9NzbbXoYwQ@public.gmane.org>
List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/spi-devel-general>,
	<mailto:spi-devel-general-request-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org?subject=unsubscribe>
List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum=spi-devel-general>
List-Post: <mailto:spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
List-Help: <mailto:spi-devel-general-request-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org?subject=help>
List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/spi-devel-general>,
	<mailto:spi-devel-general-request-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org?subject=subscribe>
Sender: spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Errors-To: spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
List-Id: linux-spi.vger.kernel.org

On Thu, 24 May 2007 12:20:22 -0500
Bill Gatliff wrote:

> Rev. F of the AT91RM9200 manual says, in 41.9.4:
> 
>     "If Mode fault is disabled, Chip Select 0 cannot be driven by a
>     component other than the SPI otherwise the transfer does not occur".
> 
> ... but if you enable mode faulting, something else breaks IIRC.
> 
> IOW, CS0 for the 9200 doesn't work if the SPI controls it.  And SPI 
> doesn't work for CS0 if the SPI controller _doesn't_ control it, 
> either.  So I've just quit using CS0.  :( 
> 

So I assume AT91RM9200 boards such as: 

static struct spi_board_info ek_spi_devices[] = {
        {       /* DataFlash chip */
                .modalias       = "mtd_dataflash",
                .chip_select    = 0,
                .max_speed_hz   = 15 * 1000 * 1000,
        },

static struct spi_board_info carmeva_spi_devices[] = {
        { /* DataFlash chip */
                .modalias = "mtd_dataflash",
                .chip_select  = 0,
                .max_speed_hz = 10 * 1000 * 1000,
        },

static struct spi_board_info dk_spi_devices[] = {
        {       /* DataFlash chip */
                .modalias       = "mtd_dataflash",
                .chip_select    = 0,
                .max_speed_hz   = 15 * 1000 * 1000,
        },

are broken cause all of them have chip_select = 0 ?

BR, Ivan


-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/