topic Re: How to create a sound-card with ESAI in i.MX Processors

How to create a sound-card with ESAI

Riyan — Wed, 18 Nov 2020 12:49:18 GMT

I need to get a sound from radio-device, which use I2S protocol. The radio-device connected to the imx8 processor through ESAI. I have to registrate the radio-device and ESAI in the linux-kernel.

sound-x28 {
        compatible = "simple-audio-card";
        simple-audio-card,name = "x28-audio";
        simple-audio-card,format="i2s";
        simple-audio-card,mclk-fs = <64>;
        simple-audio-card,frame-master = <&sound2_esai>;
        simple-audio-card,bitclock-master = <&sound2_esai>;
        simple-audio-card,widgets =
                "Microphone", "Mic Jack",
                "Line", "Line In",
                "Line", "Line Out",
                "Headphone", "Headphone Jack";
        simple-audio-card,routing =
                "DMIC AIF", "DMic";
        mux-int-port = <1>;
        mux-ext-port = <4>;
        sound2_esai: simple-audio-card,cpu {
            sound-dai = <&esai1 0>;
            system-clock-frequency = <3072000>;
            dai-tdm-slot-num = <2>;
            dai-tdm-slot-width = <32>;
        };
        sound2codec: simple-audio-card,codec {
            sound-dai = <&sound>;
        };
    };
codec_x28: codec_x28 {
            #sound-dai-cells = <0>;
            compatible = "dmic,dmic-codec";
};
&esai1{
    #sound-dai-cells=<1>;
    status="okay";
};

I don't fully understand how phandle #sound-dai-cells works. The sound-device "sound-x28" has passed a registration in the sysfs. But alsa don't see this device through aplay -l. I can't understand where I made a error in dts file. Or should I use another driver? Please, could you show me your dts with ESAI?

Re: How to create a sound-card with ESAI

igorpadykov — Wed, 18 Nov 2020 23:42:24 GMT

Hi Riyan

one can look at sound-cs42888 with esai example on

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8qm-mek.dts?h=imx_5.4.47_2.2.0

and description of audio in i.MX Linux Reference Manual

https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX?tab=In-Depth_Tab

nxp does not support "simple-audio-card" for esai.

Best regards
igor

Re: How to create a sound-card with ESAI

Riyan — Thu, 19 Nov 2020 12:09:09 GMT

Hi Igor,

thank you for the answer. But My custom board have not a chip cs42888. Or are the chip and a codec not the same?

sound-cs42888 {
compatible = "fsl,imx8qm-sabreauto-cs42888",
"fsl,imx-audio-cs42888";
model = "imx-cs42888";
esai-controller = <&esai1>;
audio-codec = <&cs42888>;
asrc-controller = <&asrc0>;
status = "okay";
};

Re: How to create a sound-card with ESAI

igorpadykov — Thu, 19 Nov 2020 13:47:59 GMT

Hi Riyan

one can use cs42888 as example and create support for other chip, follow

Figure 27. ALSA SoC Software Architecture, sect.7.1.4.1 ASoC Driver Source Architecture

i.MX Linux Reference Manual

Best regards
igor

Re: How to create a sound-card with ESAI

Riyan — Thu, 26 Nov 2020 13:42:23 GMT

The problem hasn't been solved yet. I use a driver imx-cs42888.c as you had said. But I get faults:

[ 7.824936] fsl-asoc-card custom-sound: CPU phandle missing or invalid
[ 7.824943] fsl-asoc-card: probe of custom-sound failed with error -22
[ 7.825762] imx-cs42888 custom-sound: failed to find codec platform device

custom-sound {
compatible = "fsl,imx-audio-cs42888";
model = "custom-sound";
esai-controller = <&esai1>;
audio-codec = <&codec>;
asrc-controller = <&asrc0>;
};

codec: codec {
#sound-dai-cells = <0>;
compatible = "dmic,dmic-codec";
};

&esai1{
#sound-dai-cells=<0>;
status="okay";
};

What could I do wrong?

Re: How to create a sound-card with ESAI

Riyan — Thu, 26 Nov 2020 15:19:49 GMT

Please, help me solve the problem

Re: How to create a sound-card with ESAI

dmitry_sidorenkov — Fri, 19 Jan 2024 11:11:46 GMT

imx8qm has esai interface with multiple (4RX and 6 TX) pins, but NXP doesn't provide even single example how to use it existing drivers look useless for example how to use esai bus with 2-3 independent codecs, which can be used in simple-audio-card driver, but this driver can't work with esai because can't setup clocking.
Also, https://source.codeaurora.org is not available.