drivers: spi: Update unsupported bit width in SPI driver

Add condition to check the unsupported bit width for Renesas
RA spi and spi_b driver

Signed-off-by: Quy Tran <[email protected]>

Author: quytranpzz

drivers/spi/spi_b_renesas_ra8.c

@@ -86,6 +86,7 @@ static int ra_spi_b_configure(const struct device *dev, const struct spi_config
 {
 	struct ra_spi_data *data = dev->data;
 	fsp_err_t fsp_err;
+	uint8_t word_size = SPI_WORD_SIZE_GET(config->operation);
 
 	if (spi_context_configured(&data->ctx, config)) {
 		/* Nothing to do */
@@ -100,6 +101,11 @@ static int ra_spi_b_configure(const struct device *dev, const struct spi_config
 		return -ENOTSUP;
 	}
 
+	if (word_size < 4 || word_size > 32) {
+		LOG_ERR("Unsupported SPI word size: %u", word_size);
+		return -ENOTSUP;
+	}
+
 	if (config->operation & SPI_OP_MODE_SLAVE) {
 		data->fsp_config.operating_mode = SPI_MODE_SLAVE;
 	} else {

drivers/spi/spi_renesas_ra.c

@@ -82,6 +82,7 @@ static int ra_spi_configure(const struct device *dev, const struct spi_config *c
 {
 	struct ra_spi_data *data = dev->data;
 	fsp_err_t fsp_err;
+	uint8_t word_size = SPI_WORD_SIZE_GET(config->operation);
 
 	if (spi_context_configured(&data->ctx, config)) {
 		/* Nothing to do */
@@ -96,6 +97,12 @@ static int ra_spi_configure(const struct device *dev, const struct spi_config *c
 		return -ENOTSUP;
 	}
 
+	if (!((word_size >= 8 && word_size <= 16) || word_size == 20 || word_size == 24 ||
+	      word_size == 32)) {
+		LOG_ERR("Unsupported SPI word size: %u", word_size);
+		return -ENOTSUP;
+	}
+
 	if (config->operation & SPI_OP_MODE_SLAVE) {
 		data->fsp_config.operating_mode = SPI_MODE_SLAVE;
 	} else {