[PATCH v6 7/7] ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers

[Nicolin Chen]

On Wed, Apr 01, 2020 at 04:45:40PM +0800, Shengjiu Wang wrote:
> EASRC (Enhanced Asynchronous Sample Rate Converter) is a new IP module
> found on i.MX8MN. It is different with old ASRC module.
> 
> The primary features for the EASRC are as follows:
> - 4 Contexts - groups of channels with an independent time base
> - Fully independent and concurrent context control
> - Simultaneous processing of up to 32 audio channels
> - Programmable filter charachteristics for each context
> - 32, 24, 20, and 16-bit fixed point audio sample support
> - 32-bit floating point audio sample support
> - 8kHz to 384kHz sample rate
> - 1/16 to 8x sample rate conversion ratio
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
> Signed-off-by: Cosmin-Gabriel Samoila <cosmin.samoila at nxp.com>

Overall, looks good to me.

Please add:
Acked-by: Nicolin Chen <nicoleotsuka at gmail.com>

> diff --git a/sound/soc/fsl/fsl_easrc.c b/sound/soc/fsl/fsl_easrc.c
> +static int fsl_easrc_normalize_filter(struct fsl_asrc *easrc,

> +	 * If exponent is zero (value == 0), or 7ff (value == NaNs)
[...]
> +	if (exp == 0 || exp == 0x7ff) {
[...]
> +	if ((shift > 0 && exp >= 2047) ||
> +	    (shift < 0 && exp <= 0)) {

Could fit into one line, and would be probably nicer to re-use
"0x7ff" matching previous places, instead of "2047".