From 25f7d6026e2549a73e529bef85c80579528ebb33 Mon Sep 17 00:00:00 2001
From: Chancel Liu <chancel.liu@nxp.com>
Date: Mon, 13 Jul 2026 11:22:48 +0900
Subject: [PATCH] arm64: dts: imx91-9x9-qsb: Add PDM microphone sound card
 support

Add PDM microphone sound card support, configure the pinmux.

This sound card supports recording sound from PDM microphone and
convert the PDM format data to PCM data.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 .../boot/dts/freescale/imx91-9x9-qsb.dts      | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
index 089d999196d6..044b37fcc0ba 100644
--- a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
+++ b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
@@ -42,6 +42,18 @@ codec_ep: endpoint {
 		};
 	};
 
+	dmic: dmic {
+		compatible = "dmic-codec";
+		#sound-dai-cells = <0>;
+		num-channels = <4>;
+
+		port {
+			dmic_ep: endpoint {
+				remote-endpoint = <&micfil_ep>;
+			};
+		};
+	};
+
 	can_mux: mux-controller-0 {
 		compatible = "gpio-mux";
 		#mux-control-cells = <0>;
@@ -123,6 +135,12 @@ linux,cma {
 		};
 	};
 
+	sound-micfil {
+		compatible = "audio-graph-card2";
+		label = "micfil-audio";
+		links = <&micfil_port>;
+	};
+
 	sound-wm8524 {
 		compatible = "audio-graph-card2";
 		label = "wm8524-audio";
@@ -202,6 +220,14 @@ MX91_PAD_CCM_CLKO1__GPIO3_IO26                          0x31e
 		>;
 	};
 
+	pinctrl_pdm: pdmgrp {
+		fsl,pins = <
+			MX91_PAD_PDM_CLK__PDM_CLK				0x31e
+			MX91_PAD_PDM_BIT_STREAM0__PDM_BIT_STREAM0		0x31e
+			MX91_PAD_PDM_BIT_STREAM1__PDM_BIT_STREAM1		0x31e
+		>;
+	};
+
 	pinctrl_reg_usdhc2_vmmc: regusdhc2vmmcgrp {
 		fsl,pins = <
 			MX91_PAD_SD2_RESET_B__GPIO3_IO7                         0x31e
@@ -464,6 +490,24 @@ &lpuart1 {
 	status = "okay";
 };
 
+&micfil {
+	#sound-dai-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pdm>, <&pdm_fun>;
+	assigned-clocks = <&clk IMX93_CLK_PDM>;
+	assigned-clock-parents = <&clk IMX93_CLK_AUDIO_PLL>;
+	assigned-clock-rates = <49152000>;
+	status = "okay";
+
+	micfil_port: port {
+		capture-only;
+
+		micfil_ep: endpoint {
+			remote-endpoint = <&dmic_ep>;
+		};
+	};
+};
+
 &sai1 {
 	#sound-dai-cells = <0>;
 	pinctrl-names = "default";