linux-kernel - Re: [spi-devel-general] [PATCH 2/6] [Blackfin] SPI driver: Use SPI device name to do gpio peripheral request

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Date:	Thu, 31 Jan 2008 11:12:26 +0800
From:	"Bryan Wu" <cooloney.lkml@...il.com>
To:	"David Brownell" <david-b@...bell.net>
Cc:	"Bryan Wu" <bryan.wu@...log.com>,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [spi-devel-general] [PATCH 2/6] [Blackfin] SPI driver: Use SPI device name to do gpio peripheral request

On Jan 31, 2008 5:48 AM, David Brownell <david-b@...bell.net> wrote:
> On Wednesday 30 January 2008, Bryan Wu wrote:
> > When got some gpio conflict, it is easy to know which SPI device driver not just got "bfin-spi"
> >
> > Signed-off-by: Bryan Wu <bryan.wu@...log.com>
> > ---
> >  drivers/spi/spi_bfin5xx.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
> > index 8fd1365..c3f9ed4 100644
> > --- a/drivers/spi/spi_bfin5xx.c
> > +++ b/drivers/spi/spi_bfin5xx.c
> > @@ -1176,7 +1176,7 @@ static int setup(struct spi_device *spi)
> >       if ((chip->chip_select_num > 0)
> >               && (chip->chip_select_num <= spi->master->num_chipselect))
> >               peripheral_request(ssel[spi->master->bus_num]
> > -                     [chip->chip_select_num-1], DRV_NAME);
> > +                     [chip->chip_select_num-1], spi->modalias);
>
> Better:  spi->dev.bus_id (always unique) not spi->modalias (isn't) ...
>

spi->dev.bus_id is just  number, while spi->modalias usually is a
string name which it is more meaningful.
In most time, modalias is easier for us to locate the gpio conflict.

Thanks
-Bryan Wu
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