[alsa-devel] [PATCH 1/3] ASoC: simple-card: set cpu dai clk in hw_params

[Kuninori Morimoto]

Hi Daniel

> The simple-card driver currently accepts a clock node in the cpu dai
> sub-node and only uses it as an alternative to the
> 'system-clock-frequency' property to get the current frequency.
> 
> This patch adds another use of the passed clock node. If mclk-fs is
> specified, the clock will be set to the calculated rate (stream rate *
> mclk_fs) in hw_params. This allows platforms to pass a tuneable clock
> as phandle that will automatically be set to the right rates.
> 
> Signed-off-by: Daniel Mack <daniel at zonque.org>
> ---
(snip)
>  	if (mclk_fs) {
>  		mclk = params_rate(params) * mclk_fs;
> +
> +		if (dai_props->cpu_dai.clk)
> +			clk_set_rate(dai_props->cpu_dai.clk, mclk);
> +
>  		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
>  					     SND_SOC_CLOCK_IN);
>  		if (ret && ret != -ENOTSUPP)

Having codec is nice balance ?

Best regards
---
Kuninori Morimoto