diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
index 99b94cfe1623..30a79da9c039 100644
--- a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
+++ b/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
@@ -19,11 +19,11 @@ Required properties:
 - pinctrl-0: pin control group to be used for this controller.
 - pinctrl-names: must contain a "default" entry.
 - spi-num-chipselects : the number of the chipselect signals.
-- bus-num : the slave chip chipselect signal number.
 
 Optional property:
 - big-endian: If present the dspi device's registers are implemented
   in big endian mode.
+- bus-num : the slave chip chipselect signal number.
 
 Optional SPI slave node properties:
 - fsl,spi-cs-sck-delay: a delay in nanoseconds between activating chip
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index c357c3247232..74dc0df518fa 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -1108,7 +1108,7 @@ static int dspi_probe(struct platform_device *pdev)
 	const struct regmap_config *regmap_config;
 	struct fsl_dspi_platform_data *pdata;
 	struct spi_controller *ctlr;
-	int ret, cs_num, bus_num;
+	int ret, cs_num, bus_num = -1;
 	struct fsl_dspi *dspi;
 	struct resource *res;
 	void __iomem *base;
@@ -1145,11 +1145,7 @@ static int dspi_probe(struct platform_device *pdev)
 		}
 		ctlr->num_chipselect = cs_num;
 
-		ret = of_property_read_u32(np, "bus-num", &bus_num);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "can't get bus-num\n");
-			goto out_ctlr_put;
-		}
+		of_property_read_u32(np, "bus-num", &bus_num);
 		ctlr->bus_num = bus_num;
 
 		if (of_property_read_bool(np, "spi-slave"))