spi: move more spi_setup() functionality into core
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>
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 9f9ff3a..f5b3fdb 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -530,9 +530,6 @@
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 @@
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 @@
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;