From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maris Subject: Re: Proposal spi.h Date: Wed, 10 Feb 2010 13:22:02 +0100 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-spi.vger.kernel.org > ------------------------------ > > Message: 2 > Date: Wed, 10 Feb 2010 08:36:27 +0100 > From: Maris > Subject: [spi-devel-general] Proposal spi.h > To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org > Message-ID: > Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes > > * extend spi_device struct element 'mode' to u16 (currently u8, fully > utilized as of 2.6.3x) > * chip_select to s16 (until now also u8) I forgot to mention whzy signed: negative values for gpio-indices, positive as usual for SSEL lines. -Rob > > Background: > Chip select size change: allow specification of SPI-device > hardware-related spi control per device-specific (native) or gpio-based > control. > mode size change: obligatory... A mode bit could also be assigned a > selection bit: chip_select interpreted as native SSEL-index or as > gpio-index (instead of negative value for chip_select). > > Chip select differentiation bottom line: Naming of the device. I'm not > sure how to establish this. spidev0.x are normally assigned for chip > selects driven by the SPI peripheral hardware. GPIO-based: > spidev0.gpioxx? > > -Rob > > ------------------------------------------------------------------------------ SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev