boards: lpcxpresso55s69: Enable i2c instance 4

Enables i2c instance 4 on the lpcxpresso55s69 board. Configures pinmuxes
and clocks, and updates board documentation accordingly.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>

boards/arm/lpcxpresso55s69/Kconfig.defconfig

@@ -33,8 +33,16 @@ config GPIO_MCUX_LPC_PORT1
 
 endif # GPIO_MCUX_LPC
 
+config I2C_4
+	default y
+	depends on I2C
+
 config SPI_8
 	default y
 	depends on SPI
 
+config FXOS8700_DRDY_INT1
+	default y
+	depends on FXOS8700_TRIGGER
+
 endif # BOARD_LPCXPRESSO55S69_CPU0 || BOARD_LPCXPRESSO55S69_CPU1

boards/arm/lpcxpresso55s69/doc/index.rst

@@ -62,6 +62,8 @@ features:
 +-----------+------------+-------------------------------------+
 | GPIO      | on-chip    | gpio                                |
 +-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
 | SPI       | on-chip    | spi                                 |
 +-----------+------------+-------------------------------------+
 | USART     | on-chip    | serial port-polling                 |
@@ -108,6 +110,10 @@ functionality of a pin.
 +---------+-----------------+----------------------------+
 | PIO1_7  | GPIO            | GREEN LED                  |
 +---------+-----------------+----------------------------+
+| PIO1_20 | I2C             | I2C SCL                    |
++---------+-----------------+----------------------------+
+| PIO1_21 | I2C             | I2C SDA                    |
++---------+-----------------+----------------------------+
 
 System Clock
 ============

boards/arm/lpcxpresso55s69/lpcxpresso55s69.dtsi

@@ -31,4 +31,13 @@
 	};
 };
 
+arduino_i2c: &i2c4 {
+	mma8652fc@1d {
+		compatible = "nxp,fxos8700","nxp,mma8652fc";
+		reg = <0x1d>;
+		label = "MMA8652FC";
+		int1-gpios = <&gpio1 19 GPIO_ACTIVE_LOW>;
+	};
+};
+
 arduino_spi: &spi8 {};

boards/arm/lpcxpresso55s69/lpcxpresso55s69_cpu0.dts

@@ -69,6 +69,10 @@
 	status = "okay";
 };
 
+&i2c4 {
+	status = "okay";
+};
+
 &spi8 {
 	status = "okay";
 };

boards/arm/lpcxpresso55s69/lpcxpresso55s69_cpu0.yaml

@@ -15,6 +15,8 @@ toolchain:
   - gnuarmemb
   - xtools
 supported:
+  - arduino_i2c
   - arduino_spi
   - gpio
+  - i2c
   - spi

boards/arm/lpcxpresso55s69/pinmux.c

@@ -87,6 +87,34 @@ static int lpcxpresso_55s69_pinmux_init(struct device *dev)
 	pinmux_pin_set(port1, DT_ALIAS_SW2_GPIOS_PIN, sw2_config);
 #endif
 
+#ifdef CONFIG_I2C_4
+	/* 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 /* CONFIG_I2C_4 */
+
+#ifdef CONFIG_FXOS8700_TRIGGER
+	pinmux_pin_set(port1, 19, 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
+
 #ifdef CONFIG_SPI_8
 	/* PORT0 PIN26 is configured as HS_SPI_MOSI */
 	pinmux_pin_set(port0, 26, IOCON_PIO_FUNC9 |

soc/arm/nxp_lpc/lpc55xxx/soc.c

@@ -61,6 +61,14 @@ static ALWAYS_INLINE void clock_init(void)
 	/* Enables the clock for the I/O controller.: Enable Clock. */
     CLOCK_EnableClock(kCLOCK_Iocon);
 
+#ifdef CONFIG_I2C_4
+	/* attach 12 MHz clock to FLEXCOMM4 */
+	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
+
+	/* reset FLEXCOMM for I2C */
+	RESET_PeripheralReset(kFC4_RST_SHIFT_RSTn);
+#endif /* CONFIG_I2C_4 */
+
 #ifdef CONFIG_SPI_8
 	/* Attach 12 MHz clock to FLEXCOMM8 */
 	CLOCK_AttachClk(kFRO12M_to_HSLSPI);