diff --git a/arch/arm/src/s32k1xx/s32k1xx_lpspi.c b/arch/arm/src/s32k1xx/s32k1xx_lpspi.c
index 6b02673bd8..a80636d368 100644
--- a/arch/arm/src/s32k1xx/s32k1xx_lpspi.c
+++ b/arch/arm/src/s32k1xx/s32k1xx_lpspi.c
@@ -380,47 +380,6 @@ static  struct pm_callback_s g_spi1_pmcb =
  * Private Functions
  ****************************************************************************/
 
-/****************************************************************************
- * Name: s32k1xx_lpspi_getreg8
- *
- * Description:
- *   Get the contents of the SPI register at offset
- *
- * Input Parameters:
- *   priv   - private SPI device structure
- *   offset - offset to the register of interest
- *
- * Returned Value:
- *   The contents of the 8-bit register
- *
- ****************************************************************************/
-
-static inline
-uint8_t s32k1xx_lpspi_getreg8(struct s32k1xx_lpspidev_s *priv,
-                              uint8_t offset)
-{
-  return getreg8(priv->spibase + offset);
-}
-
-/****************************************************************************
- * Name: s32k1xx_lpspi_putreg8
- *
- * Description:
- *   Write a 8-bit value to the SPI register at offset
- *
- * Input Parameters:
- *   priv   - private SPI device structure
- *   offset - offset to the register of interest
- *   value  - the 8-bit value to be written
- *
- ****************************************************************************/
-
-static inline void s32k1xx_lpspi_putreg8(struct s32k1xx_lpspidev_s *priv,
-                                         uint8_t offset, uint8_t value)
-{
-  putreg8(value, priv->spibase + offset);
-}
-
 /****************************************************************************
  * Name: s32k1xx_lpspi_getreg
  *
@@ -563,66 +522,6 @@ static inline void s32k1xx_lpspi_write_dword(struct s32k1xx_lpspidev_s
 
 #endif
 
-/****************************************************************************
- * Name: s32k1xx_lpspi_readbyte
- *
- * Description:
- *   Read one byte from SPI
- *
- * Input Parameters:
- *   priv - Device-specific state data
- *
- * Returned Value:
- *   Byte as read
- *
- ****************************************************************************/
-
-static inline
-uint8_t s32k1xx_lpspi_readbyte(struct s32k1xx_lpspidev_s *priv)
-{
-  /* Wait until the receive buffer is not empty */
-
-  while ((s32k1xx_lpspi_getreg32(priv, S32K1XX_LPSPI_SR_OFFSET) &
-          LPSPI_SR_RDF) == 0)
-    {
-    }
-
-  /* Then return the received byte */
-
-  return s32k1xx_lpspi_getreg8(priv, S32K1XX_LPSPI_RDR_OFFSET);
-}
-
-/****************************************************************************
- * Name: s32k1xx_lpspi_writebyte
- *
- * Description:
- *   Write one 8-bit frame to the SPI FIFO
- *
- * Input Parameters:
- *   priv - Device-specific state data
- *   byte - Byte to send
- *
- * Returned Value:
- *   None
- *
- ****************************************************************************/
-
-static inline
-void s32k1xx_lpspi_writebyte(struct s32k1xx_lpspidev_s *priv,
-                             uint8_t byte)
-{
-  /* Wait until the transmit buffer is empty */
-
-  while ((s32k1xx_lpspi_getreg32(priv, S32K1XX_LPSPI_SR_OFFSET) &
-          LPSPI_SR_TDF) == 0)
-    {
-    }
-
-  /* Then send the byte */
-
-  s32k1xx_lpspi_putreg8(priv, S32K1XX_LPSPI_TDR_OFFSET, byte);
-}
-
 /****************************************************************************
  * Name: s32k1xx_lpspi_9to16bitmode
  *