board: frdm_mcxn236: Enable PDM on frdm_mcxn236

Enable PDM on frdm_mcxn236 board.

Signed-off-by: Zhaoxiang Jin <[email protected]>

Author: ZhaoxiangJin

boards/nxp/frdm_mcxn236/board.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2024  NXP
+ * Copyright 2024-2025 NXP
  * SPDX-License-Identifier: Apache-2.0
  */
 #include <zephyr/init.h>
@@ -103,15 +103,18 @@ void board_early_init_hook(void)
 
 	CLOCK_SetupExtClocking(BOARD_XTAL0_CLK_HZ);
 
-#if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(sai0)) || DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(sai1))
+#if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(sai0)) || \
+	DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(sai1)) || \
+	DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(pdm))
 	/* < Set up PLL1 */
 	const pll_setup_t pll1_Setup = {
 		.pllctrl = SCG_SPLLCTRL_SOURCE(1U) | SCG_SPLLCTRL_SELI(3U) |
 				 SCG_SPLLCTRL_SELP(1U),
 		.pllndiv = SCG_SPLLNDIV_NDIV(25U),
 		.pllpdiv = SCG_SPLLPDIV_PDIV(10U),
 		.pllmdiv = SCG_SPLLMDIV_MDIV(256U),
-		.pllRate = 24576000U};
+		.pllRate = 24576000U
+	};
 
 	/* Configure PLL1 to the desired values */
 	CLOCK_SetPLL1Freq(&pll1_Setup);
@@ -339,6 +342,11 @@ void board_early_init_hook(void)
 	CLOCK_EnableClock(kCLOCK_Sai1);
 #endif
 
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(pdm), okay)
+	CLOCK_SetClkDiv(kCLOCK_DivMicfilFClk, 1U);
+	CLOCK_AttachClk(kPLL1_CLK0_to_MICFILF);
+#endif
+
 	/* Set SystemCoreClock variable. */
 	SystemCoreClock = CLOCK_INIT_CORE_CLOCK;
 }

boards/nxp/frdm_mcxn236/frdm_mcxn236-pinctrl.dtsi

@@ -233,4 +233,14 @@
 			input-enable;
 		};
 	};
+
+	pinmux_pdm: pinmux_pdm {
+		group0 {
+			pinmux = <PDM0_CLK_PIO0_16>,
+				 <PDM0_DATA0_PIO0_17>;
+			drive-strength = "high";
+			slew-rate = "fast";
+			input-enable;
+		};
+	};
 };

boards/nxp/frdm_mcxn236/frdm_mcxn236.dts

@@ -427,3 +427,8 @@ dvp_20pin_interface: &video_sdma {};
 	pinctrl-0 = <&pinmux_sai1>;
 	pinctrl-names = "default";
 };
+
+&pdm {
+	pinctrl-0 = <&pinmux_pdm>;
+	pinctrl-names = "default";
+};

dts/arm/nxp/nxp_mcxn23x_common.dtsi

@@ -985,6 +985,48 @@
 		nxp,rx-dma-channel = <3>;
 		status = "disabled";
 	};
+
+	pdm: pdm@10c000 {
+		compatible = "nxp,pdm";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <48 0>;
+		reg = <0x10c000 0x1000>;
+		clocks = <&syscon MCUX_PDM_CLK>;
+		status = "disabled";
+		quality-mode = <1>;
+		cic-decimation-rate = <0>;
+		fifo-watermark = <4>;
+		sample-rate = <16000>;
+
+		channel0: pdm-channel@0 {
+			reg = <0>;
+			status = "disabled";
+			dc-remover-cutoff-freq = <2>;
+			decimation-filter-gain = <5>;
+		};
+
+		channel1: pdm-channel@1 {
+			reg = <1>;
+			status = "disabled";
+			dc-remover-cutoff-freq = <2>;
+			decimation-filter-gain = <5>;
+		};
+
+		channel2: pdm-channel@2 {
+			reg = <2>;
+			status = "disabled";
+			dc-remover-cutoff-freq = <2>;
+			decimation-filter-gain = <5>;
+		};
+
+		channel3: pdm-channel@3 {
+			reg = <3>;
+			status = "disabled";
+			dc-remover-cutoff-freq = <2>;
+			decimation-filter-gain = <5>;
+		};
+	};
 };
 
 &systick {