drivers: spi: dw: read ssi component version

Read the Synopsys SSI component version to extend supported capability
based on the version.

Signed-off-by: Younghyun Park <younghyunpark@google.com>

Author: myguitar

drivers/spi/spi_dw.c

@@ -575,6 +575,12 @@ int spi_dw_init(const struct device *dev)
 	write_imr(dev, DW_SPI_IMR_MASK);
 	clear_bit_ssienr(dev);
 
+	/* SSI component version */
+	spi->version = read_ssi_comp_version(dev);
+	LOG_DBG("Version: %c.%c%c%c", (spi->version >> 24) & 0xff,
+		(spi->version >> 16) & 0xff, (spi->version >> 8) & 0xff,
+		spi->version & 0xff);
+
 	LOG_DBG("Designware SPI driver initialized on device: %p", dev);
 
 	err = spi_context_cs_configure_all(&spi->ctx);

drivers/spi/spi_dw.h

@@ -49,6 +49,7 @@ struct spi_dw_config {
 struct spi_dw_data {
 	DEVICE_MMIO_RAM;
 	struct spi_context ctx;
+	uint32_t version;	/* ssi comp version */
 	uint8_t dfs;	/* dfs in bytes: 1,2 or 4 */
 	uint8_t fifo_diff;	/* cannot be bigger than FIFO depth */
 };