linux-kernel - Re: [PATCH v3 3/3] iio: adc: ad7380: new driver for AD7380 ADCs

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Date: Fri, 15 Dec 2023 17:53:16 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: dlechner@...libre.com
Cc: broonie@...nel.org, conor+dt@...nel.org, devicetree@...r.kernel.org,
 jic23@...nel.org, krzysztof.kozlowski+dt@...aro.org, lgirdwood@...il.com,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-spi@...r.kernel.org, michael.hennerich@...log.com, nuno.sa@...log.com,
 robh+dt@...nel.org, stefan.popa@...log.com
Subject: Re: [PATCH v3 3/3] iio: adc: ad7380: new driver for AD7380 ADCs

Le 15/12/2023 à 11:32, David Lechner a écrit :
> This adds a new driver for the AD7380 family ADCs.
> 
> The driver currently implements basic support for the AD7380, AD7381,
> AD7383, and AD7384 2-channel differential ADCs. Support for additional
> single-ended and 4-channel chips that use the same register map as well
> as additional features of the chip will be added in future patches.
> 
> Co-developed-by: Stefan Popa <stefan.popa-OyLXuOCK7orQT0dZR+AlfA@...lic.gmane.org>
> Signed-off-by: Stefan Popa <stefan.popa-OyLXuOCK7orQT0dZR+AlfA@...lic.gmane.org>
> Reviewed-by: Nuno Sa <nuno.sa-OyLXuOCK7orQT0dZR+AlfA@...lic.gmane.org>
> Signed-off-by: David Lechner <dlechner-rdvid1DuHRBWk0Htik3J/w@...lic.gmane.org>
> ---

...

> +static void ad7380_regulator_disable(void *p)
> +{
> +	regulator_disable(p);
> +}
> +
> +static int ad7380_probe(struct spi_device *spi)
> +{
> +	struct iio_dev *indio_dev;
> +	struct ad7380_state *st;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	st = iio_priv(indio_dev);
> +	st->spi = spi;
> +	st->chip_info = spi_get_device_match_data(spi);
> +	if (!st->chip_info)
> +		return dev_err_probe(&spi->dev, -EINVAL, "missing match data\n");
> +
> +	st->vref = devm_regulator_get_optional(&spi->dev, "refio");

Hi,

devm_regulator_get_enable_optional()?
to save some LoC below and ad7380_regulator_disable()

CJ

> +	if (IS_ERR(st->vref)) {
> +		/*
> +		 * If there is no REFIO supply, then it means that we are using
> +		 * the internal 2.5V reference.
> +		 */
> +		if (PTR_ERR(st->vref) == -ENODEV)
> +			st->vref = NULL;
> +		else
> +			return dev_err_probe(&spi->dev, PTR_ERR(st->vref),
> +					     "Failed to get refio regulator\n");
> +	}
> +
> +	if (st->vref) {
> +		ret = regulator_enable(st->vref);
> +		if (ret)
> +			return ret;
> +
> +		ret = devm_add_action_or_reset(&spi->dev, ad7380_regulator_disable,
> +					       st->vref);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	st->regmap = devm_regmap_init(&spi->dev, NULL, st, &ad7380_regmap_config);
> +	if (IS_ERR(st->regmap))
> +		return dev_err_probe(&spi->dev, PTR_ERR(st->regmap),
> +				     "failed to allocate register map\n");
> +
> +	indio_dev->channels = st->chip_info->channels;
> +	indio_dev->num_channels = st->chip_info->num_channels;
> +	indio_dev->name = st->chip_info->name;
> +	indio_dev->info = &ad7380_info;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->available_scan_masks = ad7380_2_channel_scan_masks;
> +
> +	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
> +					      iio_pollfunc_store_time,
> +					      ad7380_trigger_handler, NULL);
> +	if (ret)
> +		return ret;
> +
> +	ret = ad7380_init(st);
> +	if (ret)
> +		return ret;
> +
> +	return devm_iio_device_register(&spi->dev, indio_dev);
> +}

...