linux-kernel - Re: [PATCH v2 2/2] ASoC: tlv320adcx140: Add the tlv320adcx140 codec driver family

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Date:   Tue, 18 Feb 2020 19:23:21 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] ASoC: tlv320adcx140: Add the tlv320adcx140 codec
 driver family

On Tue, Feb 18, 2020 at 11:21:40AM -0600, Dan Murphy wrote:

A couple of very small things, otherwise this looks good:

> +	if (unlikely(!tx_mask)) {
> +		dev_err(component->dev, "tx and rx masks need to be non 0\n");
> +		return -EINVAL;
> +	}

Do you really need the unlikely() annotation here?  This is *hopefully*
not a hot path.

> +static int adcx140_codec_probe(struct snd_soc_component *component)
> +{
> +	struct adcx140_priv *adcx140 = snd_soc_component_get_drvdata(component);
> +	int sleep_cfg_val = ADCX140_WAKE_DEV;
> +	u8 bias_source;
> +	u8 vref_source;
> +	int ret;
> +
> +	adcx140->supply_areg = devm_regulator_get_optional(adcx140->dev,
> +							   "areg");
> +	if (IS_ERR(adcx140->supply_areg)) {

You should really do the request and defer at the I2C level, that avoids
running through the whole card initialization repeatedly when the device
isn't ready.  Basically try to do all resource aquisition at the device
level and then use it at the card level.

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