Audio issue with IMX6 board (max98357a)

[vladzouth]

Hello NXP Community,

I'am working on a custom board based on IMX6 Solo processor and TX6S-8035 module, trying to play audio with MAX98357a codec. I just start leaning how works the device-tree I implement a simple-audio-card on the 4.1.15 linux kernel and use the following DTS as suggested in i.MX6 and MA98357a with simple-audio-card:

    codec: max98357a@0 {

        compatible = "maxim,max98357a";

        #sound-dai-cells = <0>;

    };

    sound {

        compatible = "simple-audio-card";

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_ssi1>;

        simple-audio-card,name = "TI3 Audio";

        simple-audio-card,format = "i2s";

        simple-audio-card,widgets = "Speaker", "Speakers";

        simple-audio-card,routing = "Speakers", "Speaker";

        simple-audio-card,bitclock-master = <&cpu_dai>;

        simple-audio-card,frame-master = <&cpu_dai>;

        cpu_dai: simple-audio-card,cpu {

            sound-dai = <&ssi1>;

            system-clock-frequency = <883200>;

            dai-tdm-slot-num = <2>;

            dai-tdm-slot-width = <16>;

        };

        codec_dai: simple-audio-card,codec {

            sound-dai = <&codec>;

        };

    };

&audmux {

status = "okay";

// Note: 'ssi1' (node of first SSI) corresponds to '_SSI0' below.

ssi1 {

     fsl,audmux-port = <MX31_AUDMUX_PORT1_SSI0>;

     fsl,port-config = <

           0x00000000

           IMX_AUDMUX_V2_PDCR_RXDSEL(MX31_AUDMUX_PORT3_SSI_PINS_3)

           >;

       };

aud3 {

      fsl,audmux-port = <MX31_AUDMUX_PORT3_SSI_PINS_3>;

      fsl,port-config = <

          (IMX_AUDMUX_V2_PTCR_TFSDIR |

          IMX_AUDMUX_V2_PTCR_TFSEL(MX31_AUDMUX_PORT1_SSI0) |

          IMX_AUDMUX_V2_PTCR_TCLKDIR |

          IMX_AUDMUX_V2_PTCR_TCSEL(MX31_AUDMUX_PORT1_SSI0))

          IMX_AUDMUX_V2_PDCR_RXDSEL(MX31_AUDMUX_PORT1_SSI0)

          >;

     };

};

&ssi1 {

      fsl,mode = "i2s-master";

      assigned-clocks = <&clks IMX6QDL_CLK_SSI1_SEL>, <&clks IMX6QDL_CLK_SSI1>;

      assigned-clock-parents = <&clks IMX6QDL_CLK_PLL4_AUDIO_DIV>;

      assigned-clock-rates = <0>, <49152000>; // 48kHz on SSI1 clock

      status = "okay";    

};

The MAX98357a codec is connected to SSI1. The soundcard is detected by ALSA. But when i try to play an audio file, i have nothing out on the speaker and there is no I2S signal on the SSI1 pin. Does somebody has any idea for this issue.

Thanks.

Best Regard!

Souleymane

[brobin]

I had some trouble getting the sound card (MA98357a codec with the simple-audio-card) to work with a recent revision of the imx6q (i.MX 6 Quad), so I am sharing my solution, posted here: linux device driver - Audio issue with IMX6 board (max98357a codec) - Stack Overflow 

[igorpadykov · Accepted solution]

Hi Souleymane

statement "MAX98357a codec is connected to SSI1" is not fully correct as

SSI ports are connected through AUDMUX and described in Table 81. AUDMUX Port Allocatio,

Figure 16-1. AUDMUX Block Diagram i.MX6SDL Datasheet and i.MX6SDL Reference Manual

http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6SDLRM.pdf 
http://www.nxp.com/docs/en/data-sheet/IMX6SDLCEC.pdf

So one can check TX6S-8035 module schematic to find what AUDMUX port used for codec

connection.

Best regards
igor
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