linux-kernel - Re: [PATCH 1/2] spi: new SPI bus lock/unlock functions

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Date:	Tue, 22 Sep 2009 10:15:37 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Yi Li <yi.li@...log.com>
Cc:	spi-devel-general@...ts.sourceforge.net,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Bryan Wu <cooloney@...nel.org>
Subject: Re: [PATCH 1/2] spi: new SPI bus lock/unlock functions

On Thu, Sep 17, 2009 at 18:03, Mike Frysinger wrote:
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -653,6 +653,54 @@ static void spi_complete(void *arg)
> +int spi_lock_bus(struct spi_device *spi)
> +{
> +       if (spi->master->lock_bus)
> +               return spi->master->lock_bus(spi);
> +       else
> +               return 0;
> +}
> +EXPORT_SYMBOL_GPL(spi_lock_bus);
> +
> +int spi_unlock_bus(struct spi_device *spi)
> +{
> +       if (spi->master->unlock_bus)
> +               return spi->master->unlock_bus(spi);
> +       else
> +               return 0;
> +}
> +EXPORT_SYMBOL_GPL(spi_unlock_bus);

there's nothing Blackfin-specific in the implementation of these
functions.  i think the way we should be handling these is by doing:
 - remove {lock,unlock}_bus functions from spi_master
 - move the {lock,unlock}_bus code from spi_bfin5xx.c to spi.c
 - drop the SPI_BFIN_LOCK Kconfig
 - add a new spi_master flag to spi.h like SPI_MASTER_HALF_DUPLEX --
SPI_MASTER_LOCK_BUS
 - have spi_bfin5xx.c/bfin_sport_spi.c add that flag to its master setup
 - have the common spi code key off of that flag to return ENOSYS
 - have the mmc_spi code check that bit in the master before falling
back to its hack
-mike
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