spi: spi-axi-spi-engine: Add support for MOSI idle configuration

Implement MOSI idle low and MOSI idle high to better support peripherals
that request specific MOSI behavior.

Acked-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>

Author: machschmitt

drivers/spi/spi-axi-spi-engine-ex.c

@@ -50,6 +50,7 @@
 #define SPI_ENGINE_CONFIG_CPHA			BIT(0)
 #define SPI_ENGINE_CONFIG_CPOL			BIT(1)
 #define SPI_ENGINE_CONFIG_3WIRE			BIT(2)
+#define SPI_ENGINE_CONFIG_SDO_IDLE_HIGH		BIT(3)
 
 #define SPI_ENGINE_INST_TRANSFER		0x0
 #define SPI_ENGINE_INST_ASSERT			0x1
@@ -146,6 +147,10 @@ static unsigned int spi_engine_get_config(struct spi_device *spi)
 		config |= SPI_ENGINE_CONFIG_CPHA;
 	if (spi->mode & SPI_3WIRE)
 		config |= SPI_ENGINE_CONFIG_3WIRE;
+	if (spi->mode & SPI_MOSI_IDLE_HIGH)
+		config |= SPI_ENGINE_CONFIG_SDO_IDLE_HIGH;
+	if (spi->mode & SPI_MOSI_IDLE_LOW)
+		config &= ~SPI_ENGINE_CONFIG_SDO_IDLE_HIGH;
 
 	return config;
 }
@@ -785,9 +790,13 @@ static int spi_engine_probe(struct platform_device *pdev)
 	host->num_chipselect = 8;
 
 	/* Some features depend of the IP core version. */
-	if (ADI_AXI_PCORE_VER_MINOR(version) >= 2) {
-		host->mode_bits |= SPI_CS_HIGH;
-		host->setup = spi_engine_setup;
+	if (ADI_AXI_PCORE_VER_MAJOR(version) >= 1) {
+		if (ADI_AXI_PCORE_VER_MINOR(version) >= 2) {
+			host->mode_bits |= SPI_CS_HIGH;
+			host->setup = spi_engine_setup;
+		}
+		if (ADI_AXI_PCORE_VER_MINOR(version) >= 3)
+			host->mode_bits |= SPI_MOSI_IDLE_LOW | SPI_MOSI_IDLE_HIGH;
 	}
 
 	if (host->max_speed_hz == 0)