Hi Sylwester,
[snip]
> +static int tm2_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct snd_soc_card *card = &tm2_card;
> + struct tm2_machine_priv *priv;
> + struct device_node *cpu_dai_node, *codec_dai_node;
> + int ret, i;
> +
> + if (!dev->of_node) {
> + dev_err(dev, "DT node is missing\n");
> + return -ENODEV;
> + }
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + snd_soc_card_set_drvdata(card, priv);
> + card->dev = dev;
> +
> + priv->gpio_mic_bias = devm_gpiod_get(dev, "mic-bias",
> + GPIOF_OUT_INIT_LOW);
> + if (IS_ERR(priv->gpio_mic_bias)) {
> + dev_err(dev, "Failed to get mic bias gpio\n");
> + return PTR_ERR(priv->gpio_mic_bias);
> + }
> +
> + ret = snd_soc_of_parse_card_name(card, "model");
> + if (ret < 0) {
> + dev_err(dev, "Card name is not specified\n");
> + return ret;
> + }
> +
> + ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
> + if (ret < 0) {
> + dev_err(dev, "Audio routing is not specified or invalid\n");
> + return ret;
> + }
> +
> + card->aux_dev[0].codec_of_node = of_parse_phandle(dev->of_node,
> + "audio-amplifier", 0);
> + if (!card->aux_dev[0].codec_of_node) {
> + dev_err(dev, "audio-amplifier property invalid or missing\n");
> + return -EINVAL;
> + }
> +
> + cpu_dai_node = of_parse_phandle(dev->of_node, "i2s-controller", 0);
> + if (!cpu_dai_node) {
> + dev_err(dev, "i2s-controllers property invalid or missing\n");
> + ret = -EINVAL;
> + goto err_put_amp;
> + }
> +
> + codec_dai_node = of_parse_phandle(dev->of_node, "audio-codec", 0);
> + if (!codec_dai_node) {
> + dev_err(dev, "audio-codec property invalid or missing\n");
> + ret = -EINVAL;
> + goto err_put_cpu_dai;
> + }
> +
> + for (i = 0; i < card->num_links; i++) {
> + card->dai_link[i].cpu_dai_name = NULL;
> + card->dai_link[i].cpu_name = NULL;
> + card->dai_link[i].platform_name = NULL;
> + card->dai_link[i].codec_of_node = codec_dai_node;
> + card->dai_link[i].cpu_of_node = cpu_dai_node;
> + card->dai_link[i].platform_of_node = cpu_dai_node;
> + }
> +
> + priv->codec_mclk1 = of_clk_get_by_name(codec_dai_node, "mclk1");
> + if (IS_ERR(priv->codec_mclk1)) {
> + dev_err(dev, "Failed to get mclk1 clock\n");
> + ret = PTR_ERR(priv->codec_mclk1);
> + goto err_put_codec_dai;
> + }
I think that you better to use the devm_clk_get() instead of of_clk_get_by_name()
because you don't need to handle the clk_put() when error happen and remove the this driver.
priv->codec_mclk1 = devm_clk_get(dev, "mclk1");
> +
> + /* mclk2 is optional */
> + priv->codec_mclk2 = of_clk_get_by_name(codec_dai_node, "mclk2");
> + if (IS_ERR(priv->codec_mclk2))
> + dev_info(dev, "Not using mclk2 clock\n");
priv->codec_mclk2 = devm_clk_get(dev, "mclk2");
> +
> + ret = devm_snd_soc_register_component(dev, &tm2_component,
> + tm2_ext_dai, ARRAY_SIZE(tm2_ext_dai));
> + if (ret < 0) {
> + dev_err(dev, "Failed to register component: %d\n", ret);
> + goto err_put_mclk;
> + }
> +
> + ret = devm_snd_soc_register_card(dev, card);
> + if (ret < 0) {
> + dev_err(dev, "Failed to register card: %d\n", ret);
> + goto err_put_mclk;
> + }
> +
> + return 0;
> +
> +err_put_mclk:
> + clk_put(priv->codec_mclk1);
> + if (!IS_ERR(priv->codec_mclk2))
> + clk_put(priv->codec_mclk2);
If using the devm_clk_get(), clk_put() is not needed
> +err_put_codec_dai:
> + of_node_put(codec_dai_node);
> +err_put_cpu_dai:
> + of_node_put(cpu_dai_node);
> +err_put_amp:
> + of_node_put(card->aux_dev[0].codec_of_node);
> + return ret;
> +}
> +
> +static int tm2_remove(struct platform_device *pdev)
> +{
> + struct snd_soc_card *card = &tm2_card;
> + struct tm2_machine_priv *priv = snd_soc_card_get_drvdata(card);
> +
> + clk_put(priv->codec_mclk1);
> + if (!IS_ERR(priv->codec_mclk2))
> + clk_put(priv->codec_mclk2);
ditto.
> +
> + of_node_put(card->dai_link[0].codec_of_node);
> + of_node_put(card->dai_link[0].cpu_of_node);
> + of_node_put(card->aux_dev[0].codec_of_node);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id tm2_of_match[] = {
> + { .compatible = "samsung,tm2-audio" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, tm2_of_match);
> +
> +static struct platform_driver tm2_driver = {
> + .driver = {
> + .name = "tm2-audio",
> + .pm = &snd_soc_pm_ops,
> + .of_match_table = tm2_of_match,
> + },
> + .probe = tm2_probe,
> + .remove = tm2_remove,
> +};
> +
> +module_platform_driver(tm2_driver);
> +
> +MODULE_AUTHOR("Inha Song <ideal.song@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("ALSA SoC Exynos TM2 Audio Support");
> +MODULE_LICENSE("GPL v2");
>
Thanks,
Chanwoo Choi
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