diff --git a/boards/arm/b_l4s5i_iot01a/b_l4s5i_iot01a.dts b/boards/arm/b_l4s5i_iot01a/b_l4s5i_iot01a.dts
index 7990c48c32..812687bdbb 100644
--- a/boards/arm/b_l4s5i_iot01a/b_l4s5i_iot01a.dts
+++ b/boards/arm/b_l4s5i_iot01a/b_l4s5i_iot01a.dts
@@ -124,6 +124,7 @@
 
 &spi1 {
 	pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pa7>;
+	cs-gpios = <&gpioa 2 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
 	status = "okay";
 };
 
diff --git a/boards/arm/b_l4s5i_iot01a/doc/index.rst b/boards/arm/b_l4s5i_iot01a/doc/index.rst
index fb4f9e0410..c61d0646bf 100644
--- a/boards/arm/b_l4s5i_iot01a/doc/index.rst
+++ b/boards/arm/b_l4s5i_iot01a/doc/index.rst
@@ -155,7 +155,7 @@ Default Zephyr Peripheral Mapping:
 - UART_4 TX/RX : PA0/PA1 (Arduino Serial)
 - I2C1 SCL/SDA : PB8/PB9 (Arduino I2C)
 - I2C2 SCL/SDA : PB10/PB11 (Sensor I2C bus)
-- SPI1 SCK/MISO/MOSI : PA5/PA6/PA7 (Arduino SPI)
+- SPI1 NSS/SCK/MISO/MOSI : PA2/PA5/PA6/PA7 (Arduino SPI)
 - SPI3 SCK/MISO/MOSI : PC10/PC11/PC12 (BT SPI bus)
 - PWM_2_CH1 : PA15
 - LD1 : PA5