When building with clang, the compiler compains with
drivers/spi/spi-synquacer.c:212:11: warning: variable 'bus_width' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] else if (priv->mode & SPI_TX_OCTAL) ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/spi/spi-synquacer.c:276:11: note: uninitialized use occurs here val |= ((bus_width >> 1) << BUS_WIDTH); ^~~~~~~~~ drivers/spi/spi-synquacer.c:212:7: note: remove the 'if' if its condition is always true else if (priv->mode & SPI_TX_OCTAL) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/spi/spi-synquacer.c:189:25: note: initialize the variable 'bus_width' to silence this warning
So initialize bus_width to 1 and add a warning if none of the configured modes matches
Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- drivers/spi/spi-synquacer.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c index 0cae3dfc778f..0f5d0a30c39d 100644 --- a/drivers/spi/spi-synquacer.c +++ b/drivers/spi/spi-synquacer.c @@ -186,7 +186,7 @@ static void synquacer_spi_config(struct udevice *dev, void *rx, const void *tx) struct udevice *bus = dev->parent; struct synquacer_spi_priv *priv = dev_get_priv(bus); struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev); - u32 val, div, bus_width; + u32 val, div, bus_width = 1; int rwflag;
rwflag = (rx ? 1 : 0) | (tx ? 2 : 0); @@ -211,6 +211,8 @@ static void synquacer_spi_config(struct udevice *dev, void *rx, const void *tx) bus_width = 4; else if (priv->mode & SPI_TX_OCTAL) bus_width = 8; + else + log_warning("SPI mode not configured, setting to byte mode\n");
div = DIV_ROUND_UP(125000000, priv->speed);