boards: arm: twr_ke18f: add SPI support

Add SPI support to the NXP TWR-KE18F development board. There are no
onboard SPI devices, but both SPI busses are available on the primary
Tower System elevator connector.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>

boards/arm/twr_ke18f/Kconfig

@@ -12,4 +12,19 @@ config BOARD_TWR_KE18F_FLEXIO_CLKOUT
 	help
 	  Enable the CLKOUT signal on FlexIO header pin 7 (PTE10).
 
+config BOARD_TWR_KE18F_SPI_0_PCS2
+	bool "Use PTE6 as dedicated SPI_0 PCS2 chip select"
+	depends on SPI_0
+	default y
+
+config BOARD_TWR_KE18F_SPI_1_PCS0
+	bool "Use PTD3 as dedicated SPI_1 PCS0 chip select"
+	depends on SPI_1
+	default y
+
+config BOARD_TWR_KE18F_SPI_1_PCS2
+	bool "Use PTA16 as dedicated SPI_1 PCS2 chip select"
+	depends on SPI_1
+	default y
+
 endif #BOARD_TWR_KE18F

boards/arm/twr_ke18f/Kconfig.defconfig

@@ -27,6 +27,16 @@ config I2C_1
 
 endif # I2C
 
+if SPI_MCUX_LPSPI
+
+config SPI_0
+	default y
+
+config SPI_1
+	default y
+
+endif # SPI_MCUX_LPSPI
+
 if PINMUX_MCUX
 
 config PINMUX_MCUX_PORTA

boards/arm/twr_ke18f/doc/index.rst

@@ -74,7 +74,8 @@ features:
 |           |            | trigger supported with H/W mods     |
 |           |            | explained below;                    |
 +-----------+------------+-------------------------------------+
-
+| SPI(M)    | on-chip    | spi                                 |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 ``boards/arm/twr_ke18f/twr_ke18f_defconfig``.

boards/arm/twr_ke18f/pinmux.c

@@ -53,6 +53,32 @@ static int twr_ke18f_pinmux_init(struct device *dev)
 	pinmux_pin_set(portb, 1, PORT_PCR_MUX(kPORT_MuxAlt2));
 #endif
 
+#ifdef CONFIG_SPI_0
+	/* SPI0 SCK, SIN, SOUT */
+	pinmux_pin_set(porte, 0, PORT_PCR_MUX(kPORT_MuxAlt2));
+	pinmux_pin_set(porte, 1, PORT_PCR_MUX(kPORT_MuxAlt2));
+	pinmux_pin_set(porte, 2, PORT_PCR_MUX(kPORT_MuxAlt2));
+#endif
+#ifdef CONFIG_BOARD_TWR_KE18F_SPI_0_PCS2
+	/* SPI0 PCS2 */
+	pinmux_pin_set(porte, 6, PORT_PCR_MUX(kPORT_MuxAlt2));
+#endif
+
+#ifdef CONFIG_SPI_1
+	/* SPI1 SCK, SIN, SOUT */
+	pinmux_pin_set(portd, 0, PORT_PCR_MUX(kPORT_MuxAlt3));
+	pinmux_pin_set(portd, 1, PORT_PCR_MUX(kPORT_MuxAlt3));
+	pinmux_pin_set(portd, 2, PORT_PCR_MUX(kPORT_MuxAlt3));
+#endif
+#ifdef CONFIG_BOARD_TWR_KE18F_SPI_1_PCS0
+	/* SPI1 PCS0 */
+	pinmux_pin_set(portd, 3, PORT_PCR_MUX(kPORT_MuxAlt3));
+#endif
+#ifdef CONFIG_BOARD_TWR_KE18F_SPI_1_PCS2
+	/* SPI1 PCS2 */
+	pinmux_pin_set(porta, 16, PORT_PCR_MUX(kPORT_MuxAlt3));
+#endif
+
 #ifdef CONFIG_BOARD_TWR_KE18F_FLEXIO_CLKOUT
 	/* CLKOUT */
 	pinmux_pin_set(porte, 10, PORT_PCR_MUX(kPORT_MuxAlt2));

boards/arm/twr_ke18f/twr_ke18f.dts

@@ -133,6 +133,14 @@
 	status = "ok";
 };
 
+&spi0 {
+	status = "ok";
+};
+
+&spi1 {
+	status = "ok";
+};
+
 &flash0 {
 	/*
 	 * For more information, see:

boards/arm/twr_ke18f/twr_ke18f.yaml

@@ -13,3 +13,4 @@ supported:
   - counter
   - i2c
   - hwinfo
+  - spi