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From: David Brownell <david-b@pacbell.net>
To: Ben Dooks <ben-linux@fluff.org>
Subject: Re: [spi-devel-general] [patch 2.6.27-git] spi_gpio driver
Date: Mon, 20 Oct 2008 01:37:00 -0700
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Cc: Magnus Damm <magnus.damm@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       spi-devel-general@lists.sourceforge.net,
       "linux-kernel" <linux-kernel@vger.kernel.org>
References: <200807202146.12759.mb@bu3sch.de> <200810192124.36402.david-b@pacbell.net> <20081020091127.GA4413@trinity.fluff.org>
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On Monday 20 October 2008, Ben Dooks wrote:
> On Sun, Oct 19, 2008 at 09:24:36PM -0700, David Brownell wrote:
> > From: David Brownell <dbrownell@users.sourceforge.net>
> > 
> > Generalize the old at91rm9200 "bootstrap" bitbanging SPI master driver
> > as "spi_gpio", so it works with arbitrary GPIOs and can be configured
> > through platform_data.  Such SPI masters support:
> > 
> >  - any number of bus instances (bus_num is the platform_device.id)
> >  - any number of chipselects (one GPIO per spi_device)
> >  - all four SPI_MODE values, and SPI_CS_HIGH
> >  - i/o word sizes from 1 to 32 bits;
> >  - devices configured as with any other spi_master controller
> 
> Probably worth looking at removing the s3c24xx gpio specific driver and
> replacing it with this.

Good point.  Let me know if you see any issues doing that,
beyond the need to change some boards' setup code and
defconfigs first.

- Dave


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