ES8388 codec and STM32MP1 audio routing

[DGami.1]

Hi All,

i want to use ES8388 audio coec with STM32MP157.

All hardware connections are tested, ad i can see MCLK on scope, also codec is visible on I2C bus.

But i'm facing dificulties with Device Tree configuration.

snippet from my dts file :

sound {
                compatible = "audio-graph-card";
		widgets =
			"Headphone", "Headphone Jack";
                routing =
		        "Headphone Jack", "LOUT1",
			"Headphone Jack", "ROUT1";  
                dais = <&sai2a_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 = <&es8388_tx_endpoint>;
                                format = "i2s";
                                mclk-fs = <272>;
                               // dai-tdm-slot-num = <2>;
                               // dai-tdm-slot-width = <32>;
                        };
                };
        };
};
..................
&i2c1 {
        pinctrl-names = "default", "sleep";
        pinctrl-0 = <&i2c1_pins_a>;
        pinctrl-1 = <&i2c1_sleep_pins_a>;
        i2c-scl-rising-time-ns = <100>;
        i2c-scl-falling-time-ns = <7>;
        status = "okay";
        /delete-property/dmas;
        /delete-property/dma-names;
	
	es8388: es8388@20 {
                compatible = "everest,es8388", "everest,es8328";
                reg = <0x20>;
                AVDD-supply = <&vdd_sd3v3>;
                DVDD-supply = <&vdd_sd3v3>;
                HPVDD-supply = <&vdd_sd3v3>;
                PVDD-supply = <&vdd_sd3v3>;
                clocks = <&sai2a>; 
                clock-names = "MCLK";
                es8388_port: port@0 {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        es8388_tx_endpoint: endpoint@0 {
                                reg = <0>;	  
			        remote-endpoint = <&sai2a_endpoint>;
				frame-master;
                                bitclock-master;
 
                        };
	};

Codec is connected on sai2 port. Audio device is visible through aplay -l.

Best regards,

Dimitar

[Christophe Guibout]

Hi @DGami.1​ ,

In the codec node, I see a potential problem :

clocks = <&sai2a>; 
clock-names = "MCLK";

which means that the clock is provided by SAI.

frame-master;
bitclock-master;

which means that the clock is provided by codec.

Please have a look into SAI device tree configuration wiki page which could help.

BR,

Christophe

EDIT : my comment is not clear enough because of "clock" naming, and this is not an issue.

The configuration means that CODEC is clocked by MCLK provided by SAI, and frame-master and bitlock-master mean that these signals are managed by CODEC instead of SAI.

So, you DT looks good.

Sorry for the inconvenience.