boards: arm: lpcxpresso55s16: enable I2C support

Enable I2C support for the NXP LPCXpresso55S16 EVK development board.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

boards/arm/lpcxpresso55s16/Kconfig.defconfig

@@ -28,4 +28,8 @@ config GPIO_MCUX_LPC_PORT1
 
 endif # GPIO_MCUX_LPC
 
+config FXOS8700_DRDY_INT1
+	default y
+	depends on FXOS8700_TRIGGER
+
 endif # BOARD_LPCXPRESSO55S16

boards/arm/lpcxpresso55s16/doc/index.rst

@@ -63,8 +63,12 @@ hardware features:
 +-----------+------------+-------------------------------------+
 | GPIO      | on-chip    | gpio                                |
 +-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
 | USART     | on-chip    | serial port                         |
 +-----------+------------+-------------------------------------+
+| SENSOR    | off-chip   | fxos8700 trigger                    |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not currently enabled.
 
@@ -97,6 +101,12 @@ the functionality of a pin.
 +---------+-----------------+----------------------------+
 | PIO1_18 | GPIO            | Wakeup SW1                 |
 +---------+-----------------+----------------------------+
+| PIO1_20 | I2C             | I2C SCL                    |
++---------+-----------------+----------------------------+
+| PIO1_21 | I2C             | I2C SDA                    |
++---------+-----------------+----------------------------+
+| PIO1_26 | GPIO            | FXOS8700 INT1              |
++---------+-----------------+----------------------------+
 
 System Clock
 ============
@@ -109,8 +119,8 @@ Serial Port
 ===========
 
 The LPC55S16 SoC has 8 FLEXCOMM interfaces for serial
-communication. One is configured as USART for the console and the
+communication. One is configured as USART for the console, one is
-remaining are not used.
+configured for I2C, and the remaining are not used.
 
 Programming and Debugging
 *************************

boards/arm/lpcxpresso55s16/lpcxpresso55s16_common.dtsi

@@ -61,3 +61,18 @@
 	compatible = "nxp,lpc-usart";
 	current-speed = <115200>;
 };
+
+arduino_i2c: &flexcomm4 {
+	status = "okay";
+	compatible = "nxp,lpc-i2c";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	fxos8700@1e {
+		compatible = "nxp,fxos8700";
+		reg = <0x1e>;
+		label = "FXOS8700";
+		int1-gpios = <&gpio1 26 GPIO_ACTIVE_LOW>;
+	};
+};

boards/arm/lpcxpresso55s16/lpcxpresso55s16_ns.yaml

@@ -15,4 +15,6 @@ toolchain:
   - gnuarmemb
   - xtools
 supported:
+  - arduino_i2c
   - gpio
+  - i2c

boards/arm/lpcxpresso55s16/pinmux.c

@@ -118,6 +118,35 @@ static int lpcxpresso_55s16_pinmux_init(struct device *dev)
 	pinmux_pin_set(port0, 30, port0_pin30_config);
 #endif
 
+#if DT_HAS_NODE(DT_NODELABEL(flexcomm4)) && \
+    DT_NODE_HAS_COMPAT(DT_NODELABEL(flexcomm4), nxp_lpc_i2c)
+	/* PORT1 PIN20 is configured as FC4_TXD_SCL_MISO_WS */
+	pinmux_pin_set(port1, 20, IOCON_PIO_FUNC5  |
+				  IOCON_PIO_MODE_INACT |
+				  IOCON_PIO_SLEW_STANDARD |
+				  IOCON_PIO_INV_DI |
+				  IOCON_PIO_DIGITAL_EN |
+				  IOCON_PIO_OPENDRAIN_DI);
+
+	/* PORT1 PIN21 is configured as FC4_RXD_SDA_MOSI_DATA */
+	pinmux_pin_set(port1, 21, IOCON_PIO_FUNC5  |
+				  IOCON_PIO_MODE_INACT |
+				  IOCON_PIO_SLEW_STANDARD |
+				  IOCON_PIO_INV_DI |
+				  IOCON_PIO_DIGITAL_EN |
+				  IOCON_PIO_OPENDRAIN_DI);
+#endif
+
+#ifdef CONFIG_FXOS8700_TRIGGER
+	pinmux_pin_set(port1, 26, IOCON_PIO_FUNC0 |
+				  IOCON_PIO_MODE_PULLUP |
+				  IOCON_PIO_INV_DI |
+				  IOCON_PIO_DIGITAL_EN |
+				  IOCON_PIO_INPFILT_OFF |
+				  IOCON_PIO_SLEW_STANDARD |
+				  IOCON_PIO_OPENDRAIN_DI);
+#endif
+
 	return 0;
 }