linux-kernel - Re: [PATCH v1 2/4] ASoC: codecs: pcm179x: Add support for PCM1789

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Date:   Tue, 27 Feb 2018 22:56:29 +0100
From:   Thomas Petazzoni <thomas.petazzoni@...tlin.com>
To:     Mylène Josserand <mylene.josserand@...tlin.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alexandre.belloni@...tlin.com
Subject: Re: [PATCH v1 2/4] ASoC: codecs: pcm179x: Add support for PCM1789

Hello,

On Tue, 27 Feb 2018 22:24:31 +0100, Mylène Josserand wrote:

> diff --git a/sound/soc/codecs/pcm179x-i2c.c b/sound/soc/codecs/pcm179x-i2c.c
> index 795a0657c097..83a2e1508df8 100644
> --- a/sound/soc/codecs/pcm179x-i2c.c
> +++ b/sound/soc/codecs/pcm179x-i2c.c
> @@ -26,10 +26,13 @@
>  static int pcm179x_i2c_probe(struct i2c_client *client,
>  			      const struct i2c_device_id *id)
>  {
> -	struct regmap *regmap;
> +	struct regmap *regmap = NULL;

I don't think this change is useful, since regmap is always initialized
below anyway.


> +	if (mute)
> +		val = ~(PCM1789_MUTE_L_EN | PCM1789_MUTE_R_EN);

That's not really useful with regmap_update_bits() which already does
the masking, no?

> +	else
> +		val = PCM1789_MUTE_L_EN | PCM1789_MUTE_R_EN;
> +	ret = regmap_update_bits(priv->regmap, PCM1789_SOFT_MUTE,
> +				 PCM1789_MUTE_MASK, val);

Couldn't this be:

	if (mute)
		val = 0;
	else
		val = PCM1789_MUTE_MASK;

	ret = regmap_update_bits(priv->regmap, PCM1789_SOFT_MUTE,
				 PCM1789_MUTE_MASK, val);


> +static struct snd_soc_dai_driver pcm1789_dai = {
> +	.name = "pcm1789-hifi",
> +	.playback = {
> +		.stream_name = "Playback",
> +		.channels_min = 2,
> +		.channels_max = 2,
> +		.rates = SNDRV_PCM_RATE_CONTINUOUS,
> +		.rate_min = 10000,
> +		.rate_max = 200000,
> +		.formats = PCM1792A_FORMATS, },

Nit: the closing curly brace should be on a separate line.


> +	if (type == PCM1789)
> +		return devm_snd_soc_register_component(dev,
> +						       &soc_component_dev_pcm1789,
> +						       &pcm1789_dai, 1);
> +

Perhaps a "else" here ?

>  	return devm_snd_soc_register_component(dev,
>  			&soc_component_dev_pcm179x, &pcm179x_dai, 1);

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com