boards: frdm_mcxn947: Add support for I2C

Add support for I2C

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

boards/nxp/frdm_mcxn947/board.c

@@ -99,6 +99,11 @@ static int frdm_mcxn947_init(void)
 	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1);
 #endif
 
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(flexcomm2), okay)
+	CLOCK_SetClkDiv(kCLOCK_DivFlexcom2Clk, 1u);
+	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM2);
+#endif
+
 #if DT_NODE_HAS_STATUS(DT_NODELABEL(flexcomm4), okay)
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom4Clk, 1u);
 	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);

boards/nxp/frdm_mcxn947/doc/index.rst

@@ -64,6 +64,8 @@ The FRDM-MCXN947 board configuration supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | DMA       | on-chip    | dma                                 |
 +-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
 | CLOCK     | on-chip    | clock_control                       |
 +-----------+------------+-------------------------------------+
 | FLASH     | on-chip    | soc flash                           |

boards/nxp/frdm_mcxn947/frdm_mcxn947-pinctrl.dtsi

@@ -19,6 +19,18 @@
 		};
 	};
 
+	pinmux_flexcomm2_lpi2c: pinmux_flexcomm2_lpi2c {
+		group0 {
+			pinmux = <FC2_P0_PIO4_0>,
+				<FC2_P1_PIO4_1>;
+			slew-rate = "fast";
+			drive-strength = "low";
+			input-enable;
+			bias-pull-up;
+			drive-open-drain;
+		};
+	};
+
 	pinmux_flexcomm4_lpuart: pinmux_flexcomm4_lpuart {
 		group0 {
 			pinmux = <FC4_P0_PIO1_8>,

boards/nxp/frdm_mcxn947/frdm_mcxn947.dtsi

@@ -5,6 +5,7 @@
  */
 
 #include "frdm_mcxn947-pinctrl.dtsi"
+#include <zephyr/dt-bindings/i2c/i2c.h>
 
 / {
 	aliases{
@@ -54,6 +55,12 @@
 	pinctrl-names = "default";
 };
 
+&flexcomm2_lpi2c2 {
+	pinctrl-0 = <&pinmux_flexcomm2_lpi2c>;
+	pinctrl-names = "default";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+};
+
 &flexcomm4_lpuart4 {
 	current-speed = <115200>;
 	pinctrl-0 = <&pinmux_flexcomm4_lpuart>;

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.dts

@@ -77,6 +77,14 @@
 	status = "okay";
 };
 
+&flexcomm2 {
+	status = "okay";
+};
+
+&flexcomm2_lpi2c2 {
+	status = "okay";
+};
+
 &flexcomm4 {
 	status = "okay";
 };

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.yaml

@@ -19,4 +19,5 @@ supported:
   - gpio
   - spi
   - dac
+  - i2c
 vendor: nxp