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>

diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c
index 23cc41273dd3edd161991f3c362eaf97e13a3f25..9e6101a38e8548d7562509b0cd32e279a4717ba9 100644 (file)
--- a/drivers/spi/spi-mxs.c
+++ b/drivers/spi/spi-mxs.c
@@ -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);