spi: lpspi: Extract FIFO length query helpers to common header file

To remove code duplication.

Signed-off-by: Luis Ubieda <[email protected]>

Author: ubieda

drivers/spi/spi_nxp_lpspi/spi_nxp_lpspi.c

@@ -18,16 +18,6 @@ struct lpspi_driver_data {
 	uint8_t lpspi_op_mode;
 };
 
-static inline uint8_t rx_fifo_cur_len(LPSPI_Type *base)
-{
-	return (base->FSR & LPSPI_FSR_RXCOUNT_MASK) >> LPSPI_FSR_RXCOUNT_SHIFT;
-}
-
-static inline uint8_t tx_fifo_cur_len(LPSPI_Type *base)
-{
-	return (base->FSR & LPSPI_FSR_TXCOUNT_MASK) >> LPSPI_FSR_TXCOUNT_SHIFT;
-}
-
 /* Reads a word from the RX fifo and handles writing it into the RX spi buf */
 static inline void lpspi_rx_word_write_bytes(const struct device *dev, size_t offset)
 {

drivers/spi/spi_nxp_lpspi/spi_nxp_lpspi_priv.h

@@ -54,6 +54,19 @@ struct lpspi_data {
 	uint32_t clock_freq;
 };
 
+/* Common helper functions used to interact with LPSPI FIFOs (TX and RX) when dealing
+ * with cpu-based implementation.
+ */
+static inline uint8_t rx_fifo_cur_len(LPSPI_Type *base)
+{
+	return (base->FSR & LPSPI_FSR_RXCOUNT_MASK) >> LPSPI_FSR_RXCOUNT_SHIFT;
+}
+
+static inline uint8_t tx_fifo_cur_len(LPSPI_Type *base)
+{
+	return (base->FSR & LPSPI_FSR_TXCOUNT_MASK) >> LPSPI_FSR_TXCOUNT_SHIFT;
+}
+
 /* Verifies spi_cfg validity and set up configuration of hardware for xfer
  * Unsets interrupt and watermark options, specific implementation should configure that.
  * Sets bits in the TCR ONLY *directly* relating to what is in the spi_config struct.

drivers/spi/spi_nxp_lpspi/spi_nxp_lpspi_rtio.c

@@ -113,16 +113,6 @@ static inline bool lpspi_rtio_is_done_rx(const struct device *dev)
 
 static void lpspi_rtio_iodev_complete(const struct device *dev, int status);
 
-static inline uint8_t rx_fifo_cur_len(LPSPI_Type *base)
-{
-	return (base->FSR & LPSPI_FSR_RXCOUNT_MASK) >> LPSPI_FSR_RXCOUNT_SHIFT;
-}
-
-static inline uint8_t tx_fifo_cur_len(LPSPI_Type *base)
-{
-	return (base->FSR & LPSPI_FSR_TXCOUNT_MASK) >> LPSPI_FSR_TXCOUNT_SHIFT;
-}
-
 static inline void lpspi_rtio_fetch_rx_fifo(const struct device *dev, uint8_t *buf, size_t offset,
 					    size_t fetch_len)
 {