boards: frdm_mcxc444: Add i2c support

Enable i2c and configure it to read accelerometer sensor on the board.
Test it using sample.sensor.accel_polling.

Signed-off-by: Neil Chen <[email protected]>

Author: NeilChen93

boards/nxp/frdm_mcxc444/doc/index.rst

@@ -55,6 +55,8 @@ The ``frdm_mcxc444`` board target supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | FLASH     | on-chip    | soc flash                           |
 +-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
 | LPTMR     | on-chip    | counter                             |
 +-----------+------------+-------------------------------------+
 | PIT       | on-chip    | counter                             |

boards/nxp/frdm_mcxc444/frdm_mcxc444-pinctrl.dtsi

@@ -8,6 +8,15 @@
 #include <nxp/mcx/MCXC444VLH-pinctrl.h>
 
 &pinctrl {
+	pinmux_i2c0: pinmux_i2c0 {
+		group0 {
+			pinmux = <I2C0_SCL_PTE24>,
+				<I2C0_SDA_PTE25>;
+			drive-strength = "low";
+			drive-open-drain;
+			slew-rate = "fast";
+		};
+	};
 	pinmux_lpuart0: pinmux_lpuart0 {
 		group0 {
 			pinmux = <LPUART0_RX_PTA1>,

boards/nxp/frdm_mcxc444/frdm_mcxc444.dts

@@ -20,6 +20,7 @@
 		led2 = &red_led;
 		sw0 = &user_button_2;
 		sw1 = &user_button_3;
+		accel0 = &fxls8974;
 	};
 
 	chosen {
@@ -90,6 +91,19 @@
 	status = "okay";
 };
 
+i2c0: &i2c0 {
+	status = "okay";
+	pinctrl-0 = <&pinmux_i2c0>;
+	pinctrl-names = "default";
+
+	fxls8974: fxls8974@18 {
+		status = "okay";
+		compatible = "nxp,fxls8974";
+		reg = <0x18>;
+		int1-gpios = <&gpiod 1 GPIO_ACTIVE_LOW>;
+	};
+};
+
 &lpuart0 {
 	status = "okay";
 	current-speed = <115200>;

boards/nxp/frdm_mcxc444/frdm_mcxc444.yaml

@@ -18,6 +18,7 @@ supported:
   - counter
   - flash
   - gpio
+  - i2c
   - uart
 testing:
   ignore_tags: