spi: lpspi: run transfer speed_hz sanity check

Avoid config.speed_hz is 0 when it is a divisor.

Signed-off-by: Han Xu <han.xu@nxp.com
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com
Link: https://lore.kernel.org/r/20230505064159.3964473-1-xiaoning.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org

drivers/spi/spi-fsl-lpspi.c

@@ -303,6 +303,12 @@ static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi)
 
 	perclk_rate = clk_get_rate(fsl_lpspi->clk_per);
 
+	if (!config.speed_hz) {
+		dev_err(fsl_lpspi->dev,
+			"error: the transmission speed provided is 0!\n");
+		return -EINVAL;
+	}
+
 	if (config.speed_hz > perclk_rate / 2) {
 		dev_err(fsl_lpspi->dev,
 		      "per-clk should be at least two times of transfer speed");