> + /* Check if MCLK provided */
> + rt5659->mclk = devm_clk_get(&i2c->dev, "mclk");
> + if (IS_ERR(rt5659->mclk)) {
> + if (PTR_ERR(rt5659->mclk) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;The correct thing to do here is to check if != -ENOENT and then return the error code. Otherwise you silently ignore errors if a clock was specified, but there was an error requesting it.
