linux-kernel - [PATCH v2 6/6] arm64: dts: imx943-evk: Add PDM microphone sound card support

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Message-Id: <20250528015837.488376-7-shengjiu.wang@nxp.com>
Date: Wed, 28 May 2025 09:58:37 +0800
From: Shengjiu Wang <shengjiu.wang@....com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	shengjiu.wang@...il.com,
	carlos.song@....com
Subject: [PATCH v2 6/6] arm64: dts: imx943-evk: Add PDM microphone sound card support

Add PDM micphone 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: Shengjiu Wang <shengjiu.wang@....com>
Reviewed-by: Frank Li <Frank.Li@....com>
---
 arch/arm64/boot/dts/freescale/imx943-evk.dts | 60 ++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx943-evk.dts b/arch/arm64/boot/dts/freescale/imx943-evk.dts
index 85cec644dd92..c8c3eff9df1a 100644
--- a/arch/arm64/boot/dts/freescale/imx943-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx943-evk.dts
@@ -29,6 +29,11 @@ chosen {
 		stdout-path = &lpuart1;
 	};
 
+	dmic: dmic {
+		compatible = "dmic-codec";
+		#sound-dai-cells = <0>;
+	};
+
 	reg_usdhc2_vmmc: regulator-usdhc2 {
 		compatible = "regulator-fixed";
 		off-on-delay-us = <12000>;
@@ -83,6 +88,24 @@ btcpu: simple-audio-card,cpu {
 		};
 	};
 
+	sound-micfil {
+		compatible = "fsl,imx-audio-card";
+		model = "micfil-audio";
+
+		pri-dai-link {
+			format = "i2s";
+			link-name = "micfil hifi";
+
+			codec {
+				sound-dai = <&dmic>;
+			};
+
+			cpu {
+				sound-dai = <&micfil>;
+			};
+		};
+	};
+
 	sound-wm8962 {
 		compatible = "fsl,imx-audio-wm8962";
 		audio-codec = <&wm8962>;
@@ -204,6 +227,12 @@ audio-pwren-hog {
 					gpio-hog;
 					output-high;
 				};
+
+				mqs-mic-sel-hog {
+					gpios = <11 GPIO_ACTIVE_HIGH>;
+					gpio-hog;
+					output-low;
+				};
 			};
 		};
 
@@ -314,6 +343,13 @@ pcal6416_i2c6_u44: gpio@20 {
 				#gpio-cells = <2>;
 				gpio-controller;
 
+				/* pdm selection */
+				can-pdm-sel-hog {
+					gpios = <12 GPIO_ACTIVE_HIGH>;
+					gpio-hog;
+					output-low;
+				};
+
 				sai3-sel-hog {
 					gpios = <11 GPIO_ACTIVE_HIGH>;
 					gpio-hog;
@@ -344,6 +380,22 @@ &lpuart1 {
 	status = "okay";
 };
 
+&micfil {
+	assigned-clocks = <&scmi_clk IMX94_CLK_AUDIOPLL1_VCO>,
+			  <&scmi_clk IMX94_CLK_AUDIOPLL2_VCO>,
+			  <&scmi_clk IMX94_CLK_AUDIOPLL1>,
+			  <&scmi_clk IMX94_CLK_AUDIOPLL2>,
+			  <&scmi_clk IMX94_CLK_PDM>;
+	assigned-clock-parents = <0>, <0>, <0>, <0>,
+				 <&scmi_clk IMX94_CLK_AUDIOPLL1>;
+	assigned-clock-rates = <3932160000>,
+			       <3612672000>, <393216000>,
+			       <361267200>, <49152000>;
+	pinctrl-0 = <&pinctrl_pdm>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
 &sai1 {
 	assigned-clocks = <&scmi_clk IMX94_CLK_AUDIOPLL1_VCO>,
 			  <&scmi_clk IMX94_CLK_AUDIOPLL2_VCO>,
@@ -413,6 +465,14 @@ IMX94_PAD_GPIO_IO28__LPI2C6_SCL		0x40000b9e
 		>;
 	};
 
+	pinctrl_pdm: pdmgrp {
+		fsl,pins = <
+			IMX94_PAD_PDM_CLK__PDM_CLK			0x31e
+			IMX94_PAD_PDM_BIT_STREAM0__PDM_BIT_STREAM0	0x31e
+			IMX94_PAD_PDM_BIT_STREAM1__PDM_BIT_STREAM1	0x31e
+		>;
+	};
+
 	pinctrl_sai1: sai1grp {
 		fsl,pins = <
 			IMX94_PAD_SAI1_TXFS__SAI1_TX_SYNC	0x31e
-- 
2.34.1