spi: rockchip: Support SPI_CS_HIGH

Only support the case cs-gpio

Change-Id: I899bce8d9418ee99c784726bb56534aaed27c00b
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

Author: Jon Lin

drivers/spi/spi-rockchip.c

@@ -804,7 +804,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 
 	master->auto_runtime_pm = true;
 	master->bus_num = pdev->id;
-	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST;
+	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST | SPI_CS_HIGH;
 	master->num_chipselect = 2;
 	master->dev.of_node = pdev->dev.of_node;
 	master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);