On Tue, Feb 16, 2016 at 05:33:10PM +0000, Srinivas Kandagatla wrote:

> +static int msm8x16_wcd_set_interpolator_rate(struct snd_soc_dai *dai,
> +	u8 rx_fs_rate_reg_val, u32 sample_rate)
> +{
> +	return 0;
> +}

Don't include empty functions, just remove them.