> +static int snd_acp5x_suspend(struct device *dev)
> +{
> + int ret;
> + struct acp5x_dev_data *adata;
> +
> + adata = dev_get_drvdata(dev);
> + ret = acp5x_deinit(adata->acp5x_base);
> + if (ret)
> + dev_err(dev, "ACP de-init failed\n");
> + else
> + dev_dbg(dev, "ACP de-initialized\n");
> +
> + return ret;
> +}
> +
> +static int snd_acp5x_resume(struct device *dev)
> +{
> + int ret;
> + struct acp5x_dev_data *adata;
> +
> + adata = dev_get_drvdata(dev);
> + ret = acp5x_init(adata->acp5x_base);
> + if (ret) {
> + dev_err(dev, "ACP init failed\n");
> + return ret;
> + }
> + return 0;
> +}
> +
> +static const struct dev_pm_ops acp5x_pm = {
> + .runtime_suspend = snd_acp5x_suspend,
> + .runtime_resume = snd_acp5x_resume,
> + .resume = snd_acp5x_resume,
use SET_SYSTEM_SLEEP_PM_OPS and SET_RUNTIME_PM_OPS?
also not clear why you don't have a .suspend here?
And to avoid warnings use __maybe_unused for those callbacks when PM is disabled?
