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spi: spi-mxs: Clean up setup_transfer function 

It can't be called with a NULL transfer anymore so it can be simplified
to not check for that.

Fix indention of line-wrapped code to Linux standard.

The transfer pointer can be const.

It's not necessary to check if the spi_transfer's speed_hz is zero, as
the spi core also fills it in from the spi_device.  However, the spi
core does not check if spi_device's speed is zero so we have to do
that still.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Trent Piepho 2013-10-01 13:15:40 -07:00 committed by Mark Brown
parent d426eadb1e
commit aa9e0c6feb
1 changed files with 8 additions and 11 deletions
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19
drivers/spi/spi-mxs.c
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@ -70,17 +70,14 @@ struct mxs_spi {
};
static int mxs_spi_setup_transfer(struct spi_device *dev,
struct spi_transfer *t)
const struct spi_transfer *t)
{
struct mxs_spi *spi = spi_master_get_devdata(dev->master);
struct mxs_ssp *ssp = &spi->ssp;
uint32_t hz = 0;
const unsigned int hz = min(dev->max_speed_hz, t->speed_hz);
hz = dev->max_speed_hz;
if (t && t->speed_hz)
hz = min(hz, t->speed_hz);
if (hz == 0) {
dev_err(&dev->dev, "Cannot continue with zero clock\n");
dev_err(&dev->dev, "SPI clock rate of zero not allowed\n");
return -EINVAL;
}
@ -88,12 +85,12 @@ static int mxs_spi_setup_transfer(struct spi_device *dev,
writel(BM_SSP_CTRL0_LOCK_CS,
ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);
writel(BF_SSP_CTRL1_SSP_MODE(BV_SSP_CTRL1_SSP_MODE__SPI) |
BF_SSP_CTRL1_WORD_LENGTH
(BV_SSP_CTRL1_WORD_LENGTH__EIGHT_BITS) |
((dev->mode & SPI_CPOL) ? BM_SSP_CTRL1_POLARITY : 0) |
((dev->mode & SPI_CPHA) ? BM_SSP_CTRL1_PHASE : 0),
ssp->base + HW_SSP_CTRL1(ssp));
BF_SSP_CTRL1_WORD_LENGTH(BV_SSP_CTRL1_WORD_LENGTH__EIGHT_BITS) |
((dev->mode & SPI_CPOL) ? BM_SSP_CTRL1_POLARITY : 0) |
((dev->mode & SPI_CPHA) ? BM_SSP_CTRL1_PHASE : 0),
ssp->base + HW_SSP_CTRL1(ssp));
writel(0x0, ssp->base + HW_SSP_CMD0);
writel(0x0, ssp->base + HW_SSP_CMD1);