boards: nxp/frdm_mcxn236: Support LPCMP for NXP frdm_mcxn236 board

Support LPCMP for NXP frdm_mcxn236 board

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

Author: NeilChen93

boards/nxp/frdm_mcxn236/board.c

@@ -180,6 +180,12 @@ static int frdm_mcxn236_init(void)
 	CLOCK_AttachClk(kFRO_HF_to_ADC0);
 #endif
 
+#if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(lpcmp0))
+	CLOCK_SetClkDiv(kCLOCK_DivCmp0FClk, 1U);
+	CLOCK_AttachClk(kFRO12M_to_CMP0F);
+	SPC_EnableActiveModeAnalogModules(SPC0, (kSPC_controlCmp0 | kSPC_controlCmp0Dac));
+#endif
+
 	/* Set SystemCoreClock variable. */
 	SystemCoreClock = CLOCK_INIT_CORE_CLOCK;
 

boards/nxp/frdm_mcxn236/doc/index.rst

@@ -72,6 +72,8 @@ The FRDM-MCXN236 board configuration supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | ADC       | on-chip    | adc                                 |
 +-----------+------------+-------------------------------------+
+| LPCMP     | on-chip    | sensor(comparator)                  |
++-----------+------------+-------------------------------------+
 
 Targets available
 ==================

boards/nxp/frdm_mcxn236/frdm_mcxn236-pinctrl.dtsi

@@ -100,4 +100,13 @@
 			drive-strength = "low";
 		};
 	};
+
+	pinmux_lpcmp0: pinmux_lpcmp0 {
+		group0 {
+			pinmux = <CMP0_IN0_PIO1_0>;
+			drive-strength = "low";
+			slew-rate = "fast";
+			bias-pull-up;
+		};
+	};
 };

boards/nxp/frdm_mcxn236/frdm_mcxn236.dts

@@ -121,3 +121,7 @@
 &lpadc0 {
 	status = "okay";
 };
+
+&lpcmp0 {
+	status = "okay";
+};

boards/nxp/frdm_mcxn236/frdm_mcxn236.dtsi

@@ -123,3 +123,8 @@
 	pinctrl-0 = <&pinmux_lpadc0>;
 	pinctrl-names = "default";
 };
+
+&lpcmp0 {
+	pinctrl-0 = <&pinmux_lpcmp0>;
+	pinctrl-names = "default";
+};