Imx9 enable lpspi pcs manual control

arch/arm64/src/imx9/hardware/imx9_lpspi.h

@@ -284,16 +284,11 @@
 #define LPSPI_TCR_BYSW                 (1 << 22) /* Bit 22: Byte Swap (BYSW) */
 #define LPSPI_TCR_LSBF                 (1 << 23) /* Bit 23: LSB First (LSBF) */
 #  define LPSPI_TCR_MSBF               (0 << 23) /*         MSB First */
-#define LPSPI_TCR_PCS_SHIFT            (24)      /* Bits 24-26: Peripheral Chip Select (PCS) */
-#define LPSPI_TCR_PCS_MASK             (0x07 << LPSPI_TCR_PCS_SHIFT)
+#define LPSPI_TCR_PCS_SHIFT            (24)      /* Bits 24-25: Peripheral Chip Select (PCS) */
+#define LPSPI_TCR_PCS_MASK             (0x03 << LPSPI_TCR_PCS_SHIFT)
 #  define LPSPI_TCR_PCS_0              (0x00 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[0] */
 #  define LPSPI_TCR_PCS_1              (0x01 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[1] */
 #  define LPSPI_TCR_PCS_2              (0x02 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[2] */
-#  define LPSPI_TCR_PCS_3              (0x03 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[3] */
-#  define LPSPI_TCR_PCS_4              (0x04 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[4] */
-#  define LPSPI_TCR_PCS_5              (0x05 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[5] */
-#  define LPSPI_TCR_PCS_6              (0x06 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[6] */
-#  define LPSPI_TCR_PCS_7              (0x07 << LPSPI_TCR_PCS_SHIFT) /* Transfer using PCS[7] */
 
 #define LPSPI_TCR_PRESCALE_SHIFT       (27)      /* Bits 27-29: Prescaler Value (PRESCALE) */
 #define LPSPI_TCR_PRESCALE_MASK        (0x07 << LPSPI_TCR_PRESCALE_SHIFT)

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 */

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)
 }