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spi: move more spi_setup() functionality into core

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Move some common spi_setup() error checks into the SPI framework from the
spi_master controller drivers:

 - Add a new "mode_bits" field to spi_master

 - Use that in spi_setup to validate the spi->mode value being
   requested.  Setting this new field is now mandatory for any
   controller supporting more than vanilla SPI_MODE_0.

 - Update all spi_master drivers to:

     * Initialize that field
     * Remove current spi_setup() checks using that value.

This is a net minor code shrink.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Brownell
2009-06-17 16:26:04 -07:00
committed by Linus Torvalds
parent 7d0771970c
commit e7db06b5d5
16 changed files with 57 additions and 115 deletions
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12
drivers/spi/atmel_spi.c
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@@ -530,9 +530,6 @@ atmel_spi_interrupt(int irq, void *dev_id)
return ret;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int atmel_spi_setup(struct spi_device *spi)
{
struct atmel_spi *as;
@@ -562,12 +559,6 @@ static int atmel_spi_setup(struct spi_device *spi)
return -EINVAL;
}
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
/* see notes above re chipselect */
if (!atmel_spi_is_v2()
&& spi->chip_select == 0
@@ -773,6 +764,9 @@ static int __init atmel_spi_probe(struct platform_device *pdev)
if (!master)
goto out_free;
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->bus_num = pdev->id;
master->num_chipselect = 4;
master->setup = atmel_spi_setup;