查看“Soundcard configuration”的源代码

== Overview ==
本文介绍了如何在将ST音频外围设备以及分配给'''Linux® OS'''的外部音频组件以及 [[:Category:Getting_started_with_STM32MP1_boards|STM32MP1 boards]] 时进行配置。 在这种情况下，它们由ALSA框架控制。

在[[ALSA_overview|ALSA framework]]的ASoC层中，音频硬件组件被描述为[[ALSA_overview#Component_descriptions|CPU DAIs and codec]]，它们链接在一起以创建DAI链接。声卡是收集一组DAI链接的软件组件。
以下STM32 MPU板的每个部分都描述了一个或多个声卡。 
提供了每个声卡的示意图，以及其静态和动态配置的方式。

=== Sound card schematic ===

声卡原理图概述了构成声卡的硬件和软件组件及其关系。 

下面给出的示例声卡示意图强调了声卡和设备树部分之间的链接。

[[File:alsa_soundcard_config_overview.png.png|center|link=]]

=== Static configuration ===

* Device tree

设备树允许描述，配置和连接音频硬件组件以定义声卡。用户必须遵循音频图形卡绑定<ref name="Audio graph card bindings">{{CodeSource | Linux kernel | Documentation/devicetree/bindings/sound/audio-graph-card.txt}}</ref> 来配置声卡和设备图绑定<ref name="Device graph bindings">{{CodeSource | Linux kernel | Documentation/devicetree/bindings/graph.txt}}</ref> 来连接音频组件。 用户还必须参考音频组件（编解码器和CPU DAI）绑定，以正确配置这些组件。 音频组件的绑定可以在以下各节的设备树样本中以及[[Soundcard configuration#References|References chapter]]中找到。

STMicroelectronics组态工具 [[STM32CubeMX]], 允许生成CPU DAI设备树节点。 {{Warning|STM32CubeMX不允许配置声卡和编解码器节点，这取决于板。声卡节点和编解码器节点必须通过用户部分手动填充。}}

* asound.conf <ref name="asound.conf">[https://www.alsa-project.org/main/index.php/Asoundrc asound.conf]</ref>
 
可选的asound.conf<ref name="asound.conf"></ref> 系统全局自定义设置文件提供了额外的功能，例如路由和音频样本转换。可以在/ etc目录中找到它。
* 声卡配置文件<ref name="asound.conf"></ref>

alsa-lib层在 /usr/share/alsa/cards 目录中提供卡配置文件。 这些文件允许在标准设备（例如"front", "hdmi" 或 "iec958"设备）上映射ALSA硬件设备。声卡设备树节点中定义的标签定义了卡的名称。 根据 /usr/share/alsa/cards/aliases.conf 映射，从此卡名称中检索卡配置。

=== Dynamic configuration ===

编解码器和CPU DAI驱动程序还提供ALSA控件，允许动态配置声卡。 可以在运行时通过 [[ALSA_overview#How_to_use|amixer]]实用程序更改控件，以修改音频路径中的某些设置。 例如，此类控件可用于修改编解码器中某个块的音频音量或静音状态。

可以使用[[ALSA_overview#How_to_use|alsactl]]实用程序将这些控件的自定义配置保存在asound.state配置文件中。可以在启动时通过[[ALSA_overview#How_to_use|alsactl]]恢复此配置。STM32MPU声卡带有专用的 asound.state 配置文件，可提供相关的控制设置。

== STM32MP15 evaluation board sound card configuration ==

=== Sound card overview ===

{{
ImageMap|
Image:mp15_ev_main_soundcard.png {{!}} frame {{!}} center{{!}} STM32MP15 Evaluation board sound card
rect 187 154 257 202 [[SAI internal peripheral]]
rect 187 252 257 300 [[SAI internal peripheral]]
rect 187 350 257 398 [[SAI internal peripheral]]
rect 187 448 257 496 [[SPDIFRX internal peripheral]]
rect 265 160 386 196 [[SAI Linux driver]]
rect 265 258 386 294 [[SAI Linux driver]]
rect 265 356 386 392 [[SAI Linux driver]]
rect 265 454 386 490 [[SPDIFRX Linux driver]]
rect 448 153 518 201 [[Audio_codecs_hardware_components]]
rect 448 251 518 299 [[Audio_codecs_hardware_components]]
rect 187 546 247 594 [[DFSDM internal peripheral]]
rect 187 742 247 790 [[DFSDM internal peripheral]]
rect 187 840 247 888 [[DFSDM internal peripheral]]
rect 187 644 247 692 [[DFSDM internal peripheral]]
rect 252 552 384 588 [[DFSDM Linux driver]]
rect 252 650 384 686 [[DFSDM Linux driver]]
rect 252 748 384 784 [[DFSDM Linux driver]]
rect 252 847 384 883 [[DFSDM Linux driver]]
rect 448 545 523 593 [[Audio_codecs_hardware_components#ST_MP34DT01-M]]
rect 448 644 523 692 [[Audio_codecs_hardware_components#ST_MP34DT01-M]]
rect 448 741 523 789 [[Audio_codecs_hardware_components#ST_MP34DT01-M]]
rect 448 839 523 887 [[Audio_codecs_hardware_components#ST_MP34DT01-M]]
}}

=== Static configuration ===

以下摘录来自STM32MP15评估板设备树。这里仅显示与声卡关联的节点以及最相关的属性。例如，使用{{green|green}}字体强调链接节点以形成第一个DAI链接的属性。

 / * '''SOUNDCARD''' */
 	sound {
 		compatible = "audio-graph-card<ref name="Audio graph card bindings" />";
 		label = "STM32MP1-EV";			{{highlight|/* Sound card identified as STM32MP1EV in ALSA */}}
 		routing =
 			"AIF1CLK" , "MCLK1",
 			"AIF2CLK" , "MCLK1",
 			"IN1LN" , "MICBIAS2",
 			"DMIC2DAT" , "MICBIAS1",
 			"DMIC1DAT" , "MICBIAS1";
 		dais = <&sai2a_port &sai2b_port &sai4a_port &spdifrx_port
 			&dfsdm0_port &dfsdm1_port &dfsdm2_port &dfsdm3_port>;
 	};
 
 / * '''CODECS''' */
 	spdif_out: spdif-out {
 		compatible = "linux,spdif-dit<ref name="spdif-dit">{{CodeSource | Linux kernel | Documentation/devicetree/bindings/sound/spdif-transmitter.txt}}</ref>";
 
 		spdif_out_port: port@0 {
 			spdif_out_endpoint: endpoint {
 				remote-endpoint = <&sai4a_endpoint>;
 			};
 		};
 	};
 
 	spdif_in: spdif-in {
 		compatible = "linux,spdif-dir<ref name="spdif-dir">{{CodeSource | Linux kernel | Documentation/devicetree/bindings/sound/spdif-receiver.txt}}</ref>";
 		spdif_in_port: port@0 {
 			spdif_in_endpoint: endpoint {
 				remote-endpoint = <&spdifrx_endpoint>;
 			};
 		};
 	};
 
 	dmic0: dmic@0 {
 		compatible = "[[Audio_codecs_hardware_components#ST_MP34DT01-M|dmic-codec]]";
 		port {
 			dmic0_endpoint: endpoint {
 				remote-endpoint = <&dfsdm_endpoint0>;
 			};
 		};
 	};
 
 	dmic1: dmic@1 {
 		compatible = "[[Audio_codecs_hardware_components#ST_MP34DT01-M|dmic-codec]]";
 		port {
 			dmic1_endpoint: endpoint {
 				remote-endpoint = <&dfsdm_endpoint1>;
 			};
 		};
 	};
 
 	dmic2: dmic@2 {
 		compatible = "[[Audio_codecs_hardware_components#ST_MP34DT01-M|dmic-codec]]";
 		port {
 			dmic2_endpoint: endpoint {
 				remote-endpoint = <&dfsdm_endpoint2>;
 			};
 		};
 	};
 
 	dmic3: dmic@3 {
 		compatible = "[[Audio_codecs_hardware_components#ST_MP34DT01-M|dmic-codec]]";
 		port {
 			dmic3_endpoint: endpoint {
 				remote-endpoint = <&dfsdm_endpoint3>;
 			};
 		};
 	};
 };
 
 &i2c2 {
 	wm8994: wm8994@1b {
 		compatible = "[[Audio_codecs_hardware_components#Wolfson_wm8994|wlf,wm8994]]";
 		...
 		clocks = <&sai2a>;
 		clock-names = "MCLK1";
 
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
 
 			<span id="dt_mp15_ev_main_8994_tx_port">{{green|wm8994_tx_port}}</span>: port@0 {
 				wm8994_tx_endpoint: endpoint {
 					remote-endpoint = <&[[#dt_mp15_ev_main_sai2a_ep|{{green|sai2a_endpoint}}]]>;
 				};
 			};
 
 			wm8994_rx_port: port@1 {
 				wm8994_rx_endpoint: endpoint {
 					remote-endpoint = <&sai2b_endpoint>;
 				};
 			};
 		};
 	};
 };
 
 /* '''CPU DAIS''' */
 &sai2 {
 	clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL4_Q>;
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_a>;
 	pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_a>;
 	clock-names = "pclk", "x8k", "x11k";
 
 	sai2a: audio-controller@4400b004 {
 		compatible = "[[SAI device tree configuration|st,stm32-sai-sub-a]]";
 		dma-names = "{{highlight|tx}}";				{{highlight|/* SAI set as transmitter */}}
 		clocks = <&rcc SAI2_K>;
 		clock-names = "sai_ck";
 
 		<span id="dt_mp15_ev_main_sai2a_port">{{green|sai2a_port}}</span>: port@0 {
 			<span id="dt_mp15_ev_main_sai2a_ep">{{green|sai2a_endpoint}}: endpoint {
 				remote-endpoint = <&[[#dt_mp15_ev_main_8994_tx_port|{{green|wm8994_tx_endpoint}}]]>;
 				format = "i2s";
 				mclk-fs = {{highlight|<256>}};		{{highlight|/* SAI is master clock provider */}}
 			};
 		};
 	};
 
 	sai2b: audio-controller@4400b024 {
 		compatible = "[[SAI device tree configuration|st,stm32-sai-sub-b]]";
 		dma-names = "{{highlight|rx}}";				{{highlight|/* SAI set as receiver */}}
 		clocks = <&rcc SAI2_K>, <&sai2a>;
 		clock-names = "sai_ck", "MCLK";
 
 		sai2b_port: port@0 {
 			sai2b_endpoint: endpoint {
 				remote-endpoint = <&wm8994_rx_endpoint>;
 				format = "i2s";
 				mclk-fs = {{highlight|<256>}};		{{highlight|/* SAI is master clock provider */}}
 			};
 		};
 	};
 };
 
 &sai4 {
 	clocks = <&rcc SAI4>, <&rcc PLL3_Q>, <&rcc PLL4_Q>;
 	clock-names = "pclk", "x8k", "x11k";
 
 	sai4a: audio-controller@50027004 {
 		compatible = "[[SAI device tree configuration|st,stm32-sai-sub-a]]";
 		dma-names = "tx";
 		{{highlight|st,iec60958}};					{{highlight|/* SAI configured for S/PDIF protocol*/}}
 		pinctrl-names = "default", "sleep";
 		pinctrl-0 = <&sai4a_pins_a>;
 		pinctrl-1 = <&sai4a_sleep_pins_a>;
  		clocks = <&rcc SAI4_K>;
 		clock-names = "sai_ck";
 
 		sai4a_port: port@0 {
 			sai4a_endpoint: endpoint {
 				remote-endpoint = <&spdif_out_endpoint>;
 			};
 		};
 	};
 };
 
 &spdifrx {
  	compatible = "[[SPDIFRX device tree configuration|st,stm32h7-spdifrx]]";
  	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&spdifrx_pins_a>;
 	pinctrl-1 = <&spdifrx_sleep_pins_a>;
 
 	spdifrx_port: port@0 {
 		spdifrx_endpoint: endpoint {
 			remote-endpoint = <&spdif_in_endpoint>;
 		};
 	};
 
 &dfsdm {
 	compatible = "st,stm32mp1-dfsdm";
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&dfsdm_clkout_pins_a
 		     &dfsdm_data1_pins_a &dfsdm_data3_pins_a>;
 	pinctrl-1 = <&dfsdm_clkout_sleep_pins_a
 		     &dfsdm_data1_sleep_pins_a &dfsdm_data3_sleep_pins_a>;
 	spi-max-frequency = <2048000>;
 
 	clocks = <&rcc DFSDM_K>, <&rcc ADFSDM_K>;
 	clock-names = "dfsdm", "audio";
  
 	dfsdm0: filter@0 {
 		compatible = "[[DFSDM device tree configuration|st,stm32-dfsdm-dmic]]";
 		st,adc-channels = <{{highlight|3>}}; 	 	 	{{highlight|/* Use channel 3, shared with mic U3 */}}
 		st,adc-channel-names = "{{highlight|dmic_u1}}"; 	{{highlight|/* Left mic U1 associated with Right mic U3, for stereo */}}
 		st,adc-channel-types = "SPI_R"; 	{{highlight|/* Rising edge for left channel */}}
 		st,adc-channel-clk-src = "CLKOUT"; 	{{highlight|/* CKOUT clocks the microphones */}}
 		st,filter-order = <3>;
 
 		asoc_pdm0: dfsdm-dai {
 			compatible = "[[DFSDM device tree configuration|st,stm32h7-dfsdm-dai]]";
 			#sound-dai-cells = <0>;
 			io-channels = <&dfsdm0 0>;
 			cpu_port0: port {
 				dfsdm_endpoint0: endpoint {
 					remote-endpoint = <&dmic0_endpoint>;
 				};
 			};
 		};
 	};
 
 	dfsdm1: filter@1 {
 		compatible = "[[DFSDM device tree configuration|st,stm32-dfsdm-dmic]]";
 		st,adc-channels = <1>;
 		st,adc-channel-names = "dmic_u2";
 		st,adc-channel-types = "SPI_F";
 		st,adc-channel-clk-src = "CLKOUT";
 		st,filter-order = <3>;
 
 		asoc_pdm1: dfsdm-dai {
 			compatible = "[[DFSDM device tree configuration|st,stm32h7-dfsdm-dai]]";
 			#sound-dai-cells = <0>;
 			io-channels = <&dfsdm1 0>;
 			cpu_port1: port {
 				dfsdm_endpoint1: endpoint {
 					remote-endpoint = <&dmic1_endpoint>;
 				};
 			};
 		};
 	};
 
 	dfsdm2: filter@2 {
 		compatible = "[[DFSDM device tree configuration|st,stm32-dfsdm-dmic]]";
 		st,adc-channels = <{{highlight|3}}>; 	 	 	{{highlight|/* Use channel 3, shared with mic U1 */}}
 		st,adc-channel-names = "{{highlight|dmic_u3}}"; 	{{highlight|/* Right mic U3 associated with Left mic U1, for stereo */}}
 		st,adc-channel-types = "SPI_F"; 	{{highlight|/* Falling edge for Right channel */}}
 		st,adc-channel-clk-src = "CLKOUT";
 		st,filter-order = <3>;
 
 		asoc_pdm2: dfsdm-dai {
 			compatible = "[[DFSDM device tree configuration|st,stm32h7-dfsdm-dai]]";
 			#sound-dai-cells = <0>;
 			io-channels = <&dfsdm2 0>;
 			cpu_port2: port {
 				dfsdm_endpoint2: endpoint {
 					remote-endpoint = <&dmic2_endpoint>;
 				};
 			};
 		};
 	};
 
 	dfsdm3: filter@3 {
 		compatible = "[[DFSDM device tree configuration|st,stm32-dfsdm-dmic]]";
 		st,adc-channels = <1>;
 		st,adc-channel-names = "dmic_u4";
 		st,adc-channel-types = "SPI_R";
 		st,adc-channel-clk-src = "CLKOUT";
 		st,filter-order = <3>;
 
 		asoc_pdm3: dfsdm-dai {
 			compatible = "[[DFSDM device tree configuration|st,stm32h7-dfsdm-dai]]";
 			#sound-dai-cells = <0>;
 			io-channels = <&dfsdm3 0>;
 			cpu_port3: port {
 				dfsdm_endpoint3: endpoint {
 					remote-endpoint = <&dmic3_endpoint>;
 				};
 			};
 		};
 	};
 };

用于STMP32MP15评估板的特定于卡的alsa-lib配置文件为/usr/share/alsa/cards/STM32MP1EV.conf。

=== Dynamic configuration ===

The table below gives an overview of the controls allowing configuration of the STM32MPU evaluation board "sound" sound card.

{| class="st-table"
! audio device
! CPU DAI
! codec
|-
| playback_codec
| no controls available
| [[#Wolfson wm8994 output configuration|configure codec output path]]
|-
| record_codec
| no controls available
| [[#Wolfson wm8994 input configuration|configure codec input path]]
|-
| playback_spdif
| [[ALSA_overview#IEC_controls|configure iec958]]
| no controls available
|-
| record_spdif
| [[#SPDFIRX input configuration|configure SPDFIRX input path]]
| no controls available
|}

==== Wolfson wm8994 output configuration ====

:Control commands to configure aif1 interface to headset output (HPOUT1L/R) path, on wm8994 codec:

<div style="margin-left: 2em;">
 amixer -c STM32MP1EV cset name='AIF1DAC1 Volume' '96' '96'
 amixer -c STM32MP1EV cset name='Headphone Volume' '63' '63'
 amixer -c STM32MP1EV cset name='DAC1 Volume' '50' '50'
 amixer -c STM32MP1EV cset name='DAC1L Mixer AIF1.1 Switch' 'on'
 amixer -c STM32MP1EV cset name='DAC1R Mixer AIF1.1 Switch' 'on'
 amixer -c STM32MP1EV cset name='DAC1 Switch' 'on' 'on'
 amixer -c STM32MP1EV cset name='Left Output Mixer DAC Switch' 'on'
 amixer -c STM32MP1EV cset name='Right Output Mixer DAC Switch' 'on'
 amixer -c STM32MP1EV cset name='Headphone Switch' 'on' 'on'
</div>

:Control commands to configure aif1 interface to speaker output (SPKOUTL/RP) path, on wm8994 codec:

<div style="margin-left: 2em;">
 amixer -c STM32MP1EV cset name='AIF1DAC1 Volume' '96' '96'
 amixer -c STM32MP1EV cset name='DAC1L Mixer AIF1.1 Switch' 'on'
 amixer -c STM32MP1EV cset name='DAC1R Mixer AIF1.1 Switch' 'on'
 amixer -c STM32MP1EV cset name='DAC1 Switch' 'on','on'
 amixer -c STM32MP1EV cset name='DAC1 Volume' '96','96'
 amixer -c STM32MP1EV cset name='SPKL DAC1 Volume' '50' '50'
 amixer -c STM32MP1EV cset name='SPKR DAC1 Volume' '50' '50'
 amixer -c STM32MP1EV cset name='SPKL DAC1 Switch' 'on'
 amixer -c STM32MP1EV cset name='SPKR DAC1 Switch' 'on'
 amixer -c STM32MP1EV cset name='SPKL Output Switch' 'on'
 amixer -c STM32MP1EV cset name='SPKR Output Switch' 'on'
 amixer -c STM32MP1EV cset name='Speaker Mode' 'Class AB'
 amixer -c STM32MP1EV cset name='Speaker Volume' '50' '50'
 amixer -c STM32MP1EV cset name='Speaker Mixer Volume' 3
 amixer -c STM32MP1EV cset name='Speaker Reference' 0
 amixer -c STM32MP1EV cset name='Speaker Switch' 'on'
</div>

==== Wolfson wm8994 input configuration ====

:Control commands to configure headset microphone input (IN1LN) to aif2 interface, on wm8994 codec:

<div style="margin-left: 2em;">
 amixer -c STM32MP1EV cset name='IN1L PGA IN1LN Switch' 'on'
 amixer -c STM32MP1EV cset name='IN1L PGA IN1LP Switch' 'off'
 amixer -c STM32MP1EV cset name='IN1L Volume' '25'
 amixer -c STM32MP1EV cset name='IN1L Switch' 'on'
 amixer -c STM32MP1EV cset name='MIXINL IN1L Switch' 'on'
 amixer -c STM32MP1EV cset name='MIXINL IN1L Volume' '1'
 amixer -c STM32MP1EV cset name='MIXINL IN1LP Volume' '0'
 amixer -c STM32MP1EV cset name='AIF1ADCL Source' 'Left'
 amixer -c STM32MP1EV cset name='ADCL Mux' 'ADC'
 amixer -c STM32MP1EV cset name='DAC2 Left Sidetone Volume' '12'
 amixer -c STM32MP1EV cset name='DAC2 Right Sidetone Volume' '12'
 amixer -c STM32MP1EV cset name='AIF2DAC2L Mixer Left Sidetone Switch' 'on'
 amixer -c STM32MP1EV cset name='AIF2DAC2R Mixer Right Sidetone Switch' 'on'
 amixer -c STM32MP1EV cset name='DAC2 Volume' '96' '96'
 amixer -c STM32MP1EV cset name='DAC2 Switch' 'on' 'on'
 amixer -c STM32MP1EV cset name='AIF2ADC Volume' '96' '96'
 amixer -c STM32MP1EV cset name='AIF2ADC Mux' 'AIF2ADCDAT'
 amixer -c STM32MP1EV cset name='AIF2 Boost Volume' '1'
 amixer -c STM32MP1EV cset name='ADC OSR' 'Low Power'
</div>

==== SPDFIRX input configuration ====

:Control commands to configure rx1 input path on SPDFIRX:

<div style="margin-left: 2em;">
 amixer -c STM32MP1EV cset name='SPDIFRX input' 1
</div>

== STM32MP15 disco board sound card configuration ==

=== Sound card overview ===

{{
ImageMap|
Image:Mp15_dk_main_soundcard.png {{!}} frame {{!}} center{{!}} STM32MP15 Disco board sound card
rect 187 154 256 202 [[SAI internal peripheral]]
rect 187 252 256 300 [[SAI internal peripheral]]
rect 187 350 256 398 [[SPI internal peripheral]]
rect 265 160 386 195 [[SAI Linux driver]]
rect 265 258 385 293 [[SAI Linux driver]]
rect 265 356 385 391 [[I2S Linux driver]]
rect 448 153 517 201 [[Audio_codecs_hardware_components]]
rect 448 251 517 299 [[Audio_codecs_hardware_components]]
rect 448 350 517 398 [[Audio_codecs_hardware_components]]
}}

=== Static configuration ===
The extract below is from the STM32MP15 disco board device tree. Only the nodes associated to the sound card, and the most relevant properties are shown here. As an example, the properties linking nodes to form the first DAI link are emphasized with {{green|green}} font.

 / {
 / * '''SOUNDCARD''' */
 	sound {
 		compatible = "audio-graph-card";
 		label = "STM32MP1-DK";			{{highlight|/* Sound card identified as STM32MP1DK in ALSA */}}
 		routing =
 			"Playback" , "MCLK",
 			"Capture" , "MCLK",
 			"MICL" , "Mic Bias";
 		dais = <&[[#dt_mp15_dk_main_sai2a_port|{{green|sai2a_port}}]] &sai2b_port &i2s2_port>;
 		status = "okay";
 	};
 };
 
  / * '''CODECS''' */
 &i2c1 {
 	cs42l51: cs42l51@4a {
 		compatible = "[[Audio_codecs_hardware_components#Cirrus_cs42l51|cirrus,cs42l51]]";
 		...
 
 		clocks = <&sai2a>;
 		clock-names = "MCLK";
 
 		cs42l51_port: port {
 			#address-cells = <1>;
 			#size-cells = <0>;
 
 			<span id="dt_mp15_dk_main_cs42l51_tx_endpoint">{{green|cs42l51_tx_endpoint}}</span>: endpoint@0 {
 				reg = <0>;
 				remote-endpoint = <&[[#dt_mp15_dk_main_sai2a_ep|{{green|sai2a_endpoint}}]];
 				frame-master;				{{highlight|/* codec is master */}}
 				bitclock-master;
 			};
 
 			cs42l51_rx_endpoint: endpoint@1 {
 				reg = <1>;
 				remote-endpoint = <&sai2b_endpoint>;
 				frame-master;				{{highlight|/* codec is master */}}
 				bitclock-master;
 			};
 		};
 	};
 
 	hdmi-transmitter@39 {
 		compatible = "[[Audio_codecs_hardware_components#Silab_sil9022|sil,sii9022]]";
 		...
 
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
 
 			port@0 {
 				reg = <0>;
 				sii9022_in: endpoint {
 					remote-endpoint = <&ltdc_ep0_out>;
 				};
 			};
 
 			port@1 {
 				reg = <1>;
 				sii9022_tx_endpoint: endpoint {
 					remote-endpoint = <&i2s2_endpoint>;
 				};
 			};
 		};
 	};
 };
 
 
 
 /* '''CPU DAIS''' */
 &sai2 {
 	clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_Q>;
 	clock-names = "pclk", "x8k", "x11k";
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_b>;
 	pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_b>;
 	status = "okay";
 
 	sai2a: audio-controller@4400b004 {
 		compatible = "[[SAI device tree configuration|st,stm32-sai-sub-a]]";
 		#clock-cells = <0>;
 		dma-names = "{{highlight|tx}}";				{{highlight|/* SAI set as transmitter */}}
 		clocks = <&rcc SAI2_K>;
 		clock-names = "sai_ck";
 
 		<span id="dt_mp15_dk_main_sai2a_port">{{green|sai2a_port}}</span>: port {
 			<span id="dt_mp15_dk_main_sai2a_ep">{{green|sai2a_endpoint}}: endpoint {
 				remote-endpoint = <&[[#dt_mp15_dk_main_cs42l51_tx_endpoint|{{green|cs42l51_tx_endpoint}}]]>;
 				format = "i2s";
 				mclk-fs = <256>;
 				dai-tdm-slot-num = <2>;
 				dai-tdm-slot-width = <32>;
 			};
 		};
 	};
 
 	sai2b: audio-controller@4400b024 {
 		dma-names = "{{highlight|rx}}";				{{highlight|/* SAI set as receiver */}}
 		st,sync = {{highlight|<&sai2a 2>}};			{{highlight|/* SAI2B is slave of SAI2A */}}
 		clocks = <&rcc SAI2_K>, <&sai2a>;
 		clock-names = "sai_ck", "MCLK";
 
 		sai2b_port: port {
 			sai2b_endpoint: endpoint {
 				remote-endpoint = <&cs42l51_rx_endpoint>;
 				format = "i2s";
 				mclk-fs = <256>;
 				dai-tdm-slot-num = <2>;
 				dai-tdm-slot-width = <32>;
 			};
 		};
 	};
 };
 
 &i2s2 {
 	clocks = <&rcc SPI2>, <&rcc SPI2_K>, <&rcc PLL3_Q>, <&rcc PLL4_Q>;
 	clock-names = "pclk", "i2sclk", "x8k", "x11k";
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&i2s2_pins_a>;
 	pinctrl-1 = <&i2s2_pins_sleep_a>;
 	status = "okay";
 
 	i2s2_port: port {
 		i2s2_endpoint: endpoint {
 			remote-endpoint = <&sii9022_tx_endpoint>;
 			format = "i2s";
 			mclk-fs = <256>;
 		};
 	};
 };

The card-specific alsa-lib configuration file for STMP32MP15 Disco board is /usr/share/alsa/cards/STM32MP1DK.conf.

=== Dynamic configuration ===

The table below gives an overview of the controls allowing the configuration of the STM32MPU disco board sound card.

{| class="st-table"
! audio device
! CPU DAI
! codec
|-
| playback_codec
| no controls available
| [[#Cirrus cs42l51 output configuration|configure codec output path]]
|-
| record_codec
| no controls available
| [[#Cirrus cs42l51 input configuration|configure codec input path]]
|-
| playback_hdmi
| no controls available
| no controls available
|}

==== Cirrus cs42l51 output configuration ====

:Control commands to configure the aif interface to headset output (AOUTA/B) path, on the cs42l51 codec:

<div style="margin-left: 2em;">
 amixer -c STM32MP1DK cset name='PCM Playback Switch' 'on','on'
 amixer -c STM32MP1DK cset name='PCM Playback Volume' '63','63'
 amixer -c STM32MP1DK cset name='Analog Playback Volume' '204','204'
 amixer -c STM32MP1DK cset name='PCM channel mixer' 'L R'
</div>

==== Cirrus cs42l51 input configuration ====

:Control commands to configure headset microphone input (MICIN1/AIN3A) to the aif interface, on the cs42l51 codec:

<div style="margin-left: 2em;">
 amixer -c STM32MP1DK cset name='PGA-ADC Mux Left' '3'
 amixer -c STM32MP1DK cset name='Mic Boost Volume' '1','1'
</div>

== References ==
<references />