diff --git a/arch/arm64/src/imx9/imx9_lpspi.c b/arch/arm64/src/imx9/imx9_lpspi.c
index b6caa7d4d11..5f665334d63 100644
--- a/arch/arm64/src/imx9/imx9_lpspi.c
+++ b/arch/arm64/src/imx9/imx9_lpspi.c
@@ -2094,4 +2094,38 @@ void imx9_lpspi_uninitialize(struct spi_dev_s *dev)
     }
 }
 
+/****************************************************************************
+ * Name: imx9_lpspi_select_cs
+ *
+ * Description:
+ *   Assert or de-assert internal PCS0 or PCS1 line. Can be called by
+ *   board-specific chip-select logic. Assertion of the CS is done at the
+ *   start of the next transfer and de-assertion after this function is
+ *   called again to de-assert the cs and the transfer has ended.
+ *
+ * Input Parameters:
+ *   dev    - Device-specific state data
+ *   cs     - Chip select 0 or 1
+ *   select - true: assert CS, false: de-assert CS
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void imx9_lpspi_select_cs(struct spi_dev_s *dev, int cs, bool select)
+{
+  struct imx9_lpspidev_s  *priv = (struct imx9_lpspidev_s *)dev;
+
+  if (select)
+    {
+      uint32_t pcs = (cs << LPSPI_TCR_PCS_SHIFT) & LPSPI_TCR_PCS_MASK;
+      imx9_lpspi_modifytcr(priv, LPSPI_TCR_PCS_MASK, pcs | LPSPI_TCR_CONT);
+    }
+  else
+    {
+      imx9_lpspi_modifytcr(priv, LPSPI_TCR_CONT, 0);
+    }
+}
+
 #endif /* CONFIG_IMX9_LPSPI */
diff --git a/arch/arm64/src/imx9/imx9_lpspi.h b/arch/arm64/src/imx9/imx9_lpspi.h
index 0e39c31f696..280474712ef 100644
--- a/arch/arm64/src/imx9/imx9_lpspi.h
+++ b/arch/arm64/src/imx9/imx9_lpspi.h
@@ -148,6 +148,27 @@ int imx9_lpspi_register(struct spi_dev_s *dev,
                         void *arg);
 #endif
 
+/****************************************************************************
+ * Name: imx9_lpspi_select_cs
+ *
+ * Description:
+ *   Assert or de-assert internal PCS0 or PCS1 line. Can be called by
+ *   board-specific chip-select logic. Assertion of the CS is done at the
+ *   start of the next transfer and de-assertion after this function is
+ *   called again to de-assert the cs and the transfer has ended.
+ *
+ * Input Parameters:
+ *   dev    - Device-specific state data
+ *   cs     - Chip select 0 or 1
+ *   select - true: assert CS, false: de-assert CS
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void imx9_lpspi_select_cs(struct spi_dev_s *dev, int cs, bool select);
+
 #undef EXTERN
 #if defined(__cplusplus)
 }