mclk = devm_clk_get(&pdev->dev, "mclk");
if (IS_ERR(mclk)) {
	dev_err(&pdev->dev, "Failed to get MCLK\n");
	return ret;
}

unsigned int mclk_rate = clk_get_rate(mclk);
if (!mclk_rate) {
	dev_err(&pdev->dev, "Invalid slow clock rate\n");
	return -EINVAL;
}

ret = clk_prepare_enable(mclk);
if (ret) {
	dev_err(&pdev->dev, "Could not enable mclk clock\n");
	return ret;
}