[PATCH v2 0/3] Add audio support on i.MX91 9x9 QSB

[PATCH v2 0/3] Add audio support on i.MX91 9x9 QSB

[Chancel Liu]

From: Chancel Liu <chancel.liu@nxp.com>

The board routes audio related signals through on-board muxes controlled
by a GPIO expander. Add the mux states required by SAI1 playback and PDM
capture. Add support for WM8524 and PDM microphone sound cards in DT.

Changes in v2:
- Bindings have been applied, remove from this series
- Reorder pinctrl-gpiomux children alphabetically
- Move compatible to be the first property in the wm8524 codec node
- Move vendor property fsl,sai-mclk-direction-output after clock-names
  and before status in the sai1 node
Link to v1: https://lore.kernel.org/imx/20260707065725.312450-1-chancel.liu@oss.nxp.com/

Chancel Liu (3):
  arm64: dts: imx91-9x9-qsb: Add audio-related board muxes
  arm64: dts: imx91-9x9-qsb: Add WM8524 sound card support
  arm64: dts: imx91-9x9-qsb: Add PDM microphone sound card support

 .../boot/dts/freescale/imx91-9x9-qsb.dts      | 160 ++++++++++++++++++
 1 file changed, 160 insertions(+)

--
2.50.1

[PATCH v2 1/3] arm64: dts: imx91-9x9-qsb: Add audio-related board muxes

[Chancel Liu]

From: Chancel Liu <chancel.liu@nxp.com>

The board uses GPIO-controlled muxes to route shared signals between
different functions.

Add the audio-related mux states for:
- selecting PDM or CAN1
- selecting SAI1 or M.2
- enabling the SAI1 audio path or not

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
---
 .../boot/dts/freescale/imx91-9x9-qsb.dts      | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
index ea8cf14e0bc6..4821ac312ab2 100644
--- a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
+++ b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
@@ -30,6 +30,55 @@ chosen {
 		stdout-path = &lpuart1;
 	};
 
+	can_mux: mux-controller-0 {
+		compatible = "gpio-mux";
+		#mux-control-cells = <0>;
+		#mux-state-cells = <1>;
+		mux-gpios = <&pcal6524 17 GPIO_ACTIVE_HIGH>;
+	};
+
+	sai1_mux: mux-controller-1 {
+		compatible = "gpio-mux";
+		#mux-control-cells = <0>;
+		#mux-state-cells = <1>;
+		mux-gpios = <&pcal6524 18 GPIO_ACTIVE_HIGH>;
+	};
+
+	sai1_en_mux: mux-controller-2 {
+		compatible = "gpio-mux";
+		#mux-control-cells = <0>;
+		#mux-state-cells = <1>;
+		mux-gpios = <&pcal6524 9 GPIO_ACTIVE_HIGH>;
+	};
+
+	pinctrl-gpiomux {
+		compatible = "pinctrl-multiplexer";
+
+		can_fun: can-grp {
+			mux-states = <&can_mux 1>;
+		};
+
+		m2_fun: m2-grp {
+			mux-states = <&sai1_mux 1>;
+		};
+
+		pdm_fun: pdm-grp {
+			mux-states = <&can_mux 0>;
+		};
+
+		sai1_disable: sai1-disable-grp {
+			mux-states = <&sai1_en_mux 1>;
+		};
+
+		sai1_enable: sai1-enable-grp {
+			mux-states = <&sai1_en_mux 0>;
+		};
+
+		sai1_fun: sai1-grp {
+			mux-states = <&sai1_mux 0>;
+		};
+	};
+
 	reg_vref_1v8: regulator-adc-vref {
 		compatible = "regulator-fixed";
 		regulator-name = "vref_1v8";
-- 
2.50.1

[PATCH v2 2/3] arm64: dts: imx91-9x9-qsb: Add WM8524 sound card support

[Chancel Liu]

From: Chancel Liu <chancel.liu@nxp.com>

Add WM8524 sound card support which connects to SAI1.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
---
 .../boot/dts/freescale/imx91-9x9-qsb.dts      | 67 +++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
index 4821ac312ab2..e5983bb083ea 100644
--- a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
+++ b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
@@ -110,6 +110,28 @@ linux,cma {
 			linux,cma-default;
 		};
 	};
+
+	sound-wm8524 {
+		compatible = "audio-graph-card2";
+		label = "wm8524-audio";
+		links = <&sai1_port1>;
+		widgets = "Line", "Line Out Jack";
+		routing =
+			"Line Out Jack", "LINEVOUTL",
+			"Line Out Jack", "LINEVOUTR";
+	};
+
+	wm8524: audio-codec {
+		compatible = "wlf,wm8524";
+		#sound-dai-cells = <0>;
+		wlf,mute-gpios = <&pcal6524 2 GPIO_ACTIVE_LOW>;
+
+		port {
+			codec_ep: endpoint {
+				remote-endpoint = <&sai1_ep1>;
+			};
+		};
+	};
 };
 
 &adc1 {
@@ -186,6 +208,15 @@ MX91_PAD_SD2_RESET_B__GPIO3_IO7                         0x31e
 		>;
 	};
 
+	pinctrl_sai1: sai1grp {
+		fsl,pins = <
+			MX91_PAD_SAI1_TXC__SAI1_TX_BCLK				0x31e
+			MX91_PAD_SAI1_TXFS__SAI1_TX_SYNC			0x31e
+			MX91_PAD_SAI1_TXD0__SAI1_TX_DATA0			0x31e
+			MX91_PAD_SAI1_RXD0__SAI1_MCLK				0x31e
+		>;
+	};
+
 	pinctrl_uart1: uart1grp {
 		fsl,pins = <
 			MX91_PAD_UART1_RXD__LPUART1_RX                          0x31e
@@ -433,6 +464,42 @@ &lpuart1 {
 	status = "okay";
 };
 
+&sai1 {
+	#sound-dai-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai1>, <&sai1_fun>, <&sai1_enable>;
+	assigned-clocks = <&clk IMX93_CLK_SAI1>;
+	assigned-clock-parents = <&clk IMX93_CLK_AUDIO_PLL>;
+	assigned-clock-rates = <24576000>;
+	clocks = <&clk IMX93_CLK_SAI1_IPG>, <&clk IMX93_CLK_DUMMY>,
+		 <&clk IMX93_CLK_SAI1_GATE>, <&clk IMX93_CLK_DUMMY>,
+		 <&clk IMX93_CLK_DUMMY>, <&clk IMX93_CLK_AUDIO_PLL>;
+	clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3", "pll8k";
+	fsl,sai-mclk-direction-output;
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		sai1_port1: port@1 {
+			reg = <1>;
+			playback-only;
+
+			sai1_ep1: endpoint {
+				dai-format = "i2s";
+				dai-tdm-slot-num = <2>;
+				dai-tdm-slot-width = <32>;
+				bitclock-master;
+				frame-master;
+				mclk-fs = <256>;
+				system-clock-direction-out;
+				remote-endpoint = <&codec_ep>;
+			};
+		};
+	};
+};
+
 &usbotg1 {
 	adp-disable;
 	disable-over-current;
-- 
2.50.1

[PATCH v2 3/3] arm64: dts: imx91-9x9-qsb: Add PDM microphone sound card support

[Chancel Liu]

From: Chancel Liu <chancel.liu@nxp.com>

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>
---
 .../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 e5983bb083ea..2f663b1f7c56 100644
--- a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
+++ b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
@@ -79,6 +79,18 @@ sai1_fun: sai1-grp {
 		};
 	};
 
+	dmic: dmic {
+		compatible = "dmic-codec";
+		#sound-dai-cells = <0>;
+		num-channels = <4>;
+
+		port {
+			dmic_ep: endpoint {
+				remote-endpoint = <&micfil_ep>;
+			};
+		};
+	};
+
 	reg_vref_1v8: regulator-adc-vref {
 		compatible = "regulator-fixed";
 		regulator-name = "vref_1v8";
@@ -111,6 +123,12 @@ 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";
-- 
2.50.1

Re: [PATCH v2 3/3] arm64: dts: imx91-9x9-qsb: Add PDM microphone sound card support

[Frank Li]

On Fri, Jul 10, 2026 at 11:42:04AM +0900, Chancel Liu wrote:
> From: Chancel Liu <chancel.liu@nxp.com>
>
> 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>
> ---
>  .../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 e5983bb083ea..2f663b1f7c56 100644
> --- a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
> +++ b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
> @@ -79,6 +79,18 @@ sai1_fun: sai1-grp {
>  		};
>  	};
>
> +	dmic: dmic {


Is it order? look like it is after pinctrl-gpiomux, can you try best to
keep nodename orderred.

Frank


> +		compatible = "dmic-codec";
> +		#sound-dai-cells = <0>;
> +		num-channels = <4>;
> +
> +		port {
> +			dmic_ep: endpoint {
> +				remote-endpoint = <&micfil_ep>;
> +			};
> +		};
> +	};
> +
>  	reg_vref_1v8: regulator-adc-vref {
>  		compatible = "regulator-fixed";
>  		regulator-name = "vref_1v8";
> @@ -111,6 +123,12 @@ 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";
> --
> 2.50.1
>
>