samples: i2s_codec: Enable nxp micfil sample

Enable nxp micfil sample with 'CONFIG_USE_DMIC=y',
you can hear the voice played from the on-board micphone.

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

Author: ZhaoxiangJin

samples/drivers/i2s/i2s_codec/boards/frdm_mcxn236.conf

@@ -0,0 +1,14 @@
+# Copyright 2025 NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+CONFIG_DMA_TCD_QUEUE_SIZE=4
+CONFIG_AUDIO_CODEC_DA7212=y
+CONFIG_SAMPLE_FREQ=16000
+CONFIG_I2S_INIT_BUFFERS=1
+CONFIG_USE_CODEC_CLOCK=y
+CONFIG_USE_DMIC=n
+CONFIG_USE_DMIC=y
+CONFIG_DMIC_CHANNELS=1
+CONFIG_EXTRA_BLOCKS=10
+CONFIG_SAMPLE_WIDTH=32
+CONFIG_BYTES_PER_SAMPLE=4

samples/drivers/i2s/i2s_codec/boards/frdm_mcxn236.overlay

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		i2s-codec-tx = &sai1;
+		i2s-tx = &sai1;
+	};
+};
+
+&sai1 {
+	mclk-output;
+};
+
+dmic_dev: &micfil {
+	channel0: micfil-channel@0 {
+		status = "okay";
+	};
+
+	channel1: micfil-channel@1 {
+		status = "okay";
+	};
+};

samples/drivers/i2s/i2s_codec/sample.yaml

@@ -10,6 +10,7 @@ tests:
       - mimxrt1060_evk/mimxrt1062/qspi
       - mimxrt1180_evk/mimxrt1189/cm33
       - mimxrt1180_evk/mimxrt1189/cm7
+      - frdm_mcxn236
     harness: console
     harness_config:
       type: one_line