[ 4420.217387] sun4i-dai 1c22400.i2s: Entered sun4i_dai_probe
[ 4420.217395] sun4i-dai 1c22400.i2s: probe 1
[ 4420.217670] test printk
[ 4420.217678] sun4i-dai 1c22400.i2s: probe return 0

sun4i_dai_probe function:

    ret = snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
    if (ret) {
        dev_err(&pdev->dev, "Could not register PCM\n");
        goto err_disable_clk;
    }

    printk("test printk\n");
    dev_dbg(&pdev->dev, "probe return 0\n");
    return 0;

err_disable_clk:
    clk_disable_unprepare(sdai->bus_clk);
    return ret;

static int sun4i_dai_dai_probe(struct snd_soc_dai *dai)
{
    struct sun4i_dai *sdai = snd_soc_dai_get_drvdata(dai);

    /* Enable the whole hardware block */
    regmap_write(sdai->regmap, SUN4I_DAI_CTRL_REG,
             SUN4I_DAI_CTRL_GL_EN);

    snd_soc_dai_init_dma_data(dai, &sdai->playback_dma_data, NULL);

    snd_soc_dai_set_drvdata(dai, sdai);

    printk("%s +%d\n", __func__, __LINE__);   // this doesn't get called !!!!!

    return 0;
}