how to connect stm32mp157c-dk2 with WM8960 Audio HAT

[l_Homme]

Hello everyone, I would like to connect the stm32mp157c-dk2 card with the wm8960 audio codec,here is the device tree configuration I made.

/* sound card*/
 
 snd_i2s2: snd_i2s2 {
 
            compatible = "audio-graph-card";
            widgets =
                        "Microphone", "Mic Jack",
                        "Line", "Line In",
                        "Line", "Line Out",
                        "Speaker", "Speaker",
                        "Headphone", "Headphone Jack";
 
 
            routing =
                        "Headphone Jack", "HP_L",
                        "Headphone Jack", "HP_R",
                        "Speaker", "SPK_LP",
                        "Speaker", "SPK_LN",
                        "LINPUT1", "Mic Jack",
                        "LINPUT3", "Mic Jack",
                        "RINPUT1", "Mic Jack",
                        "RINPUT2", "Mic Jack";
 
                        
            dais = <&i2s3_port>;
            status = "okay";
    };
 
/* i2s3 pin definition */
 
&pinctrl {
 
		i2s3_pins_a: i2s3-0 {
		
			pins1 {
				pinmux = <STM32_PINMUX('E', 12, AF5)>, /* SCK */
					<STM32_PINMUX('E', 14, AF5)>; /* SDI */
					bias-disable;
					drive-push-pull;
					slew-rate = <1>;
				};
 
				pins2 {
					pinmux = <STM32_PINMUX('E', 13, AF5)>; /* SDO */
					bias-disable;
				};
		};
 
		i2s3_pins_sleep_a:i2s3-1{
			pins {
				pinmux = <STM32_PINMUX('E', 12, ANALOG)>, /* SCK */
					 <STM32_PINMUX('E', 13, ANALOG)>, /* SDI */
					<STM32_PINMUX('E', 14, ANALOG)>; /* SDO */
			};
		};
 
        
};
 
/* codec control using i2c5*/
 
&i2c5 {
		pinctrl-names = "default", "sleep";
		pinctrl-0 = <&i2c5_pins_a>;
		pinctrl-1 = <&i2c5_pins_sleep_a>;
		i2c-scl-rising-time-ns = <185>;
		i2c-scl-falling-time-ns = <20>;
		status = "okay";
		/delete-property/dmas;
		/delete-property/dma-names;
		 
		// Device tree node for Audio Codec
 
		wm8960: wm8960@1a { 
				compatible = "wlf,wm8960";
				reg = <0x1a>;
				AVDD-supply = <&v3v3>;
				clocks = <&rcc SPI3>;
				clock-names = "mclk";
				wlf,shared-lrclk;
				 
				codec_port: port@0 {
					codec_endpoint: endpoint {
						remote-endpoint = <&i2s3_endpoint>;
					};
				};
 
		};
 
};
 
 
 
 
/* audio dai */
 
&i2s3 {
		clocks = <&rcc SPI3>, <&rcc SPI3_K>, <&rcc PLL3_Q>, <&rcc PLL3_R>;
		clock-names = "pclk", "i2sclk", "x8k", "x11k";
		pinctrl-names = "default", "sleep";
		pinctrl-0 = <&i2s3_pins_a>;
		pinctrl-1 = <&i2s3_pins_sleep_a>;
		status = "okay";
		 
		i2s3_port: port {
			i2s3_endpoint: endpoint {
				remote-endpoint = <&codec_endpoint>;
				format = "i2s";
				mclk-fs = <256>;
			};
		};
};

I have the following error showing when I try to record audio.

arecord: pcm_read:2143: read error: input/output error

[   2.215178] st,stm32-i2s 4000c000.audio-controller: No cache defaults, reading back from HW

thank you in advance

[Christophe Guibout]

Hello @l_Homme​ ,

Could you please confirm that you reworked your board to be able to use IIS from Rpi connector ?

• SB1, SB2, SB3 and SB4 have to be unsoldered (in order to disconnect embedded audio codec)
• SB13, SB14, SB15 and SB16 have to be closed to connect IIS to SAI2.

The schematic available in the wiki : Link.

I'am not sure to understand the i2s3 entry in the DT, because I think that codec_endpoint needs to be connected to SAI.

	wm8960: wm8960{
	[...]
		ports {
			[...]
			wm8960_tx_endpoint: port@0 {
				reg = <0>;
				remote-endpoint = <&sai2a_endpoint>;
			};
 
			wm8960_rx_endpoint: port@1 {
				reg = <1>;
				remote-endpoint = <&sai2b_endpoint>;
			};
		};
	};

And connect them to SAI like the hereafter patch :

 		sai2a_port: port {
 			sai2a_endpoint: endpoint {
-				remote-endpoint = <&cs42l51_tx_endpoint>;
+				remote-endpoint = <&wm8960_tx_endpoint>;
 				format = "i2s";
 				mclk-fs = <256>;
 				dai-tdm-slot-num = <2>;
 				dai-tdm-slot-width = <32>;
 			};
 
 
 		sai2b_port: port {
 			sai2b_endpoint: endpoint {
-				remote-endpoint = <&cs42l51_rx_endpoint>;
+				remote-endpoint = <&wm8960_rx_endpoint>;
 				format = "i2s";
 				mclk-fs = <256>;
 				dai-tdm-slot-num = <2>;
 				dai-tdm-slot-width = <32>;
 			};
 		};

BR,

Christophe

[l_Homme]

thanks for your answer,

however i want to use both codecs, that of the stm32mp1 card (CS42L51) and my new external codec.

so replace the remote-endpoint = <& cs42l51_rx_endpoint>; by remote-endpoint = <& wm8960_rx_endpoint>; don't bother me. you offer me what solution? thank you

[User.44]

hello，

Have you solved the problem？ I have the same problem as you。

   sound: sound {
        compatible = "audio-graph-card";
        label = "STM32MP1-DK";
 
        widgets =
            "Microphone", "Mic Jack",
            "Line", "Line In",
            "Line", "Line Out",
            "Speaker", "Speaker",
            "Headphone", "Headphone Jack";
 
        routing =
            "Headphone Jack", "HP_L",
            "Headphone Jack", "HP_R",
            "Speaker", "SPK_LP",
            "Speaker", "SPK_LN",
            "Speaker", "SPK_RP",
            "Speaker", "SPK_RN",
            "LINPUT1", "Mic Jack",
            "LINPUT3", "Mic Jack",
            "RINPUT1", "Mic Jack",
            "RINPUT2", "Mic Jack";
 
        dais = <&sai2a_port &sai2b_port  &sai4a_port &spdifrx_port &i2s2_port>;
        status = "okay";
    };
 
&sai2 {
    clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_R>;
    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 {
        #clock-cells = <0>;
        dma-names = "tx";
        clocks = <&rcc SAI2_K>;
        clock-names = "sai_ck";
        status = "okay";
 
        sai2a_port: port {
            sai2a_endpoint: endpoint {
                remote-endpoint = <&wm8960_tx_endpoint>;
                format = "i2s";
                mclk-fs = <256>;
                dai-tdm-slot-num = <2>;
                dai-tdm-slot-width = <32>;
            };
        };
    };
   sai2b: audio-controller@4400b024 {
        dma-names = "rx";
        st,sync = <&sai2a 2>;
        clocks = <&rcc SAI2_K>, <&sai2a>;
        clock-names = "sai_ck", "MCLK";
        status = "okay";
 
        sai2b_port: port {
            sai2b_endpoint: endpoint {
                remote-endpoint = <&wm8960_rx_endpoint>;
                format = "i2s";
                mclk-fs = <256>;
                dai-tdm-slot-num = <2>;
                dai-tdm-slot-width = <32>;
            };
        };
    };
};
    wm8960: wm8960@1a {
        compatible = "wlf,wm8960";
        reg = <0x1a>;
        #sound-dai-cells = <0>;
        status = "okay";
        //wlf,shared-lrclk;
        wlf,capless;
        clocks = <&sai2a>;
        clock-names = "MCLK1";
 
        ports {
            #address-cells = <1>;
            #size-cells = <0>;
 
            wm8960_tx_port: port@0 {
                reg = <0>;
                wm8960_tx_endpoint: endpoint {
                    remote-endpoint = <&sai2a_endpoint>;
                };
            };
 
            wm8960_rx_port: port@1 {
                reg = <1>;
                wm8960_rx_endpoint: endpoint {
                    remote-endpoint = <&sai2b_endpoint>;
                };
            };
        };

I have the following error showing when I try to record audio.

arecord: pcm_read:2143: read error: input/output error

[  4.369396] st,stm32-i2s 4000b000.audio-controller: No cache defaults, reading back from HW

[Christophe Guibout]

Hello @l_Homme​ ,

It's not possible to use the 2 channels of both codecs on Disco board because both codecs share same wires / SAI.

BTY, do you plan to use tx and rx for each codec ?

BR,

Christophe

[l_Homme]

Hello @Christophe Guibout​ ,

no no I would like to use only the RX for each codec

[Christophe Guibout]

Hello @l_Homme​ ,

In that case, I would recommend to connect sai2a_endpoint to wm8960_rx_endpoint and sai2b_endpoint to cs42l51_rx_endpoint.

You also need to open/close SB1~SB4 and SB13~SB16 accordingly.

BR,

Christophe