linux-kernel - Re: [PATCH v2 2/2] ASoC: fsl_spdif: Add support for imx6sx platform

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Message-ID: <20200617062457.GA6411@Asurada-Nvidia>
Date:   Tue, 16 Jun 2020 23:24:58 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     timur@...nel.org, Xiubo.Lee@...il.com, festevam@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, lgirdwood@...il.com,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] ASoC: fsl_spdif: Add support for imx6sx platform

On Wed, Jun 17, 2020 at 12:30:17PM +0800, Shengjiu Wang wrote:
> The one difference on imx6sx platform is that the root clock
> is shared with ASRC module, so we add a new flags
> "shared_root_clock" which means the root clock is independent,

"shared" means "not independent", against "independent" ;)

> then we will not do the clk_set_rate and clk_round_rate to avoid
> impact ASRC module usage.
> 
> As add a new flags, we include the soc specific data struct.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>

Can add this once fixing the remaining comments:

Reviewed-by: Nicolin Chen <nicoleotsuka@...il.com>

> +static inline bool fsl_spdif_can_set_clk_rate(struct fsl_spdif_priv *spdif,
> +					      int clk)

Can actually merge into single line as kernel has 100-character
limit now, though 80-char is still preferable for a good coding
style. But I think this one wouldn't be too bad at all.

> @@ -421,7 +456,7 @@ static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
>  	sysclk_df = spdif_priv->sysclk_df[rate];
>  
>  	/* Don't mess up the clocks from other modules */

We can drop this comments now as it's out-of-date and the name of
the new helper function is straightforward enough.

> -	if (clk != STC_TXCLK_SPDIF_ROOT)
> +	if (!fsl_spdif_can_set_clk_rate(spdif_priv, clk))
>  		goto clk_set_bypass;
>  
>  	/* The S/PDIF block needs a clock of 64 * fs * txclk_df */