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asoc-simple-card：升级到内核 6.18.x 后出现解析错误

您好，

这是我为内核 6.6.52 编写的工作 DT：

/ {
codec: max98357a@0{
        compatible = "maxim,max98357a";
        #sound-dai-cells = <0>;
        pinctrl-names = "default";
        pinctrl-0 = <&sdmode_en>;
        sdmode-gpios = <&gpio4 28 GPIO_ACTIVE_HIGH>;
        status = "okay";
    };

    sound {
        compatible = "simple-audio-card";

        simple-audio-card,name = "SAI3 MAX98357A";
        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 = <&sai3>;
            clocks = <&clk IMX8MP_CLK_SAI3>;
            clock-names = "mclk";
            //system-clock-frequency = <&clk IMX8MP_CLK_AUDIOMIX_SAI3_MCLK1>;
            dai-tdm-slot-num = <2>;
            dai-tdm-slot-width = <32>;
        };

        codec_dai: simple-audio-card,codec {
            sound-dai = <&codec>;
            //clocks = <&clk IMX8MP_CLK_SAI3>;
        };
    };
};
&sai3{
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_sai3>;
    #sound-dai-cells = <0>;

    clocks = <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_SAI3_IPG>,
             <&clk IMX8MP_CLK_DUMMY>,
             <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_SAI3_MCLK1>,
             <&clk IMX8MP_CLK_DUMMY>,
             <&clk IMX8MP_CLK_DUMMY>,
             <&clk IMX8MP_AUDIO_PLL1_OUT>,
             <&clk IMX8MP_AUDIO_PLL2_OUT>;
    clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3", "pll8k", "pll11k";

    assigned-clocks = <&clk IMX8MP_CLK_SAI3>,
                      <&clk IMX8MP_AUDIO_PLL1>,
                      <&clk IMX8MP_AUDIO_PLL2>;

    assigned-clock-parents = <&clk IMX8MP_AUDIO_PLL2_OUT>,
                             <&clk IMX8MP_AUDIO_PLL1_OUT>;
    // Try common MCLK rates that divide well to 48 kHz multiples
    // Option A: 24.576 MHz (very common for MAX98357A + 48 kHz)
    assigned-clock-rates = <24576000>,       // PLL2 for 48 kHz
                           <22579200>;       // PLL1 for 44.1 kHz

    // Option B (if 44.1 kHz needed later): use PLL1 + 22579200
    //assigned-clock-rates = <22579200>;
    fsl,sai-asynchronous;
    fsl,sai-mclk-direction-output;
    status = "okay";
};

升级到内核 6.18.20 后，SAI3 无法探测，而且我的声卡也无法工作。

启动日志显示：
平台声音：延迟探测待处理：asoc-simple-card：解析错误

从内核 6.6.52 到 6.18.x，DT 语法有哪些变化？我没有找到任何相关信息。我该如何调查解析错误？

i.MX 8M | i.MX 8M Mini | i.MX 8M Nano

Linux

Yocto Project

Re: asoc-simple-card: parse error after upgrading to kernel 6.18.x

你好，

能否请您分享一下您的dmesg日志？

顺祝商祺！

Re: asoc-simple-card: parse error after upgrading to kernel 6.18.x

嗨，豪尔赫，

dmesg 日志和运行设备树（./dtc -I fs -O dts /proc/device-tree > /tmp/running.dts）随附的。

Re: asoc-simple-card: parse error after upgrading to kernel 6.18.x

您好，

我向前迈出了一步。启用内核配置选项 CONFIG_IMX_AIPSTZ=y 后，声卡设备即可使用。

由于 sai3 节点是 aips5 的子节点，因此我还需要在设备树中启用 aips5：

&aips5 {
status = "okay";
};

现在我收到以下错误信息：

[ 13.081746] fsl-sai 30c30000.sai: ASoC error (-110): at snd_soc_dai_hw_params() on sai-tx-rx
[ 13.090223] sai-tx-rx-HiFi: ASoC error (-110): at __soc_pcm_hw_params() on sai-tx-rx-HiFi

speaker-test -c 2 -r 48000 -t sine 2>&1 | head -20
[ 31.368187] fsl-sai 30c30000.sai: ASoC error (-110): at snd_soc_dai_hw_params() on sai-tx-rx
[ 31.376682] sai-tx-rx-HiFi: ASoC error (-110): at __soc_pcm_hw_params() on sai-tx-rx-HiFi
Unable to set hw params for playback: Connection timed out

speaker-test 1.2.11

Playback device is default
Stream parameters are 48000Hz, S16_LE, 2 channels
Sine wave rate is 440.0000Hz
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 24 to 131072
Period size range from 12 to 16383
Periods = 4
Setting of hwparams failed: Connection timed out

Re: asoc-simple-card: parse error after upgrading to kernel 6.18.x

我明白了，声音正常了。

我的内核配置：

CONFIG_SND_IMX_SOC=m
CONFIG_SND_IMX_SOC=m
CONFIG_SND_SOC_FSL_SAI=m
CONFIG_SND_SOC_FSL_UTILS=m
CONFIG_IMX_AIPSTZ=y

设备树部分：

/{
    codec: max98357a@0{
        compatible = "maxim,max98357a";
        #sound-dai-cells = <0>;
        pinctrl-names = "default";
        pinctrl-0 = <&sdmode_en>;
        sdmode-gpios = <&gpio4 28 GPIO_ACTIVE_HIGH>;
        status = "okay";
    };

    sound {
        compatible = "simple-audio-card";
        status = "okay";
        simple-audio-card,name = "SAI3 MAX98357A";
        simple-audio-card,format = "i2s";
        simple-audio-card,widgets = "Speaker", "Speaker Ext";
        simple-audio-card,routing = "Speaker Ext", "Speaker";
        simple-audio-card,bitclock-master = <&cpu_dai>;
        simple-audio-card,frame-master = <&cpu_dai>;

        cpu_dai: simple-audio-card,cpu {
            sound-dai = <&sai3>;
            clocks = <&clk IMX8MP_CLK_SAI3>;
            clock-names = "mclk";
            //system-clock-frequency = <&clk IMX8MP_CLK_AUDIOMIX_SAI3_MCLK1>;
            dai-tdm-slot-num = <2>;
            dai-tdm-slot-width = <32>;
        };

        codec_dai: simple-audio-card,codec {
            sound-dai = <&codec>;
        };
    };
};

&sdma2 {
    status = "okay";
    fsl,sdma-ram-script-name = "imx/sdma/sdma-imx7d.bin";
};

&aips5 {
    status = "okay";
};

&audio_blk_ctrl {
    status = "okay";
    assigned-clocks = <&clk IMX8MP_AUDIO_PLL1>,
                      <&clk IMX8MP_AUDIO_PLL2>;
    assigned-clock-rates = <393216000>, <361267200>;
};

&sai3{
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_sai3>;
    #sound-dai-cells = <0>;
    assigned-clocks = <&clk IMX8MP_CLK_SAI3>;
    assigned-clock-parents = <&clk IMX8MP_AUDIO_PLL1_OUT>;
    assigned-clock-rates = <12288000>;

    clocks = <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_SAI3_IPG>,
             <&clk IMX8MP_CLK_DUMMY>,
             <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_SAI3_MCLK1>,
             <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_SAI3_MCLK2>,
             <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_SAI3_MCLK3>;
    clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";

    dmas = <&sdma2 4 2 0>, <&sdma2 5 2 0>;
    dma-names = "rx", "tx";
    
    fsl,sai-asynchronous;
    fsl,sai-mclk-direction-output;
    status = "okay";
};

设备树基础文件为 imx8mp.dtsi