linux-kernel - Re: [PATCH v2 5/5] iio: adc: ad7944: use devm_regulator_get_enable_read

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Date: Fri, 14 Jun 2024 17:16:54 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: David Lechner <dlechner@...libre.com>, Jonathan Cameron
 <jic23@...nel.org>
Cc: Marcelo Schmitt <marcelo.schmitt1@...il.com>, Nuno Sá
 <nuno.sa@...log.com>, Michael Hennerich <Michael.Hennerich@...log.com>,
 Mark Brown <broonie@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 linux-iio@...r.kernel.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] iio: adc: ad7944: use
 devm_regulator_get_enable_read_voltage

On Wed, 2024-06-12 at 16:03 -0500, David Lechner wrote:
> This makes use of the new devm_regulator_get_enable_read_voltage()
> function to reduce boilerplate code.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---
> 
> v2 changes:
> - don't read voltage from refin regulator
> - avoid else in return value checks
> ---
>  drivers/iio/adc/ad7944.c | 54 +++++++++++-------------------------------------
>  1 file changed, 12 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7944.c b/drivers/iio/adc/ad7944.c
> index e2cb64cef476..f8bf03feba07 100644
> --- a/drivers/iio/adc/ad7944.c
> +++ b/drivers/iio/adc/ad7944.c
> @@ -464,23 +464,17 @@ static const char * const ad7944_power_supplies[] = {
>  	"avdd",	"dvdd",	"bvdd", "vio"
>  };
>  
> -static void ad7944_ref_disable(void *ref)
> -{
> -	regulator_disable(ref);
> -}
> -
>  static int ad7944_probe(struct spi_device *spi)
>  {
>  	const struct ad7944_chip_info *chip_info;
>  	struct device *dev = &spi->dev;
>  	struct iio_dev *indio_dev;
>  	struct ad7944_adc *adc;
> -	bool have_refin = false;
> -	struct regulator *ref;
> +	bool have_refin;
>  	struct iio_chan_spec *chain_chan;
>  	unsigned long *chain_scan_masks;
>  	u32 n_chain_dev;
> -	int ret;
> +	int ret, ref_mv;
>  
>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
>  	if (!indio_dev)
> @@ -531,47 +525,23 @@ static int ad7944_probe(struct spi_device *spi)
>  	 * - external reference: REF is connected, REFIN is not connected
>  	 */
>  
> -	ref = devm_regulator_get_optional(dev, "ref");
> -	if (IS_ERR(ref)) {
> -		if (PTR_ERR(ref) != -ENODEV)
> -			return dev_err_probe(dev, PTR_ERR(ref),
> -					     "failed to get REF supply\n");
> +	ret = devm_regulator_get_enable_read_voltage(dev, "ref");
> +	if (ret < 0 && ret != -ENODEV)
> +		return dev_err_probe(dev, ret, "failed to get REF voltage\n");
>  
> -		ref = NULL;
> -	}
> +	ref_mv = ret == -ENODEV ? 0 : ret / 1000;
>  
>  	ret = devm_regulator_get_enable_optional(dev, "refin");
> -	if (ret == 0)
> -		have_refin = true;
> -	else if (ret != -ENODEV)
> -		return dev_err_probe(dev, ret,
> -				     "failed to get and enable REFIN supply\n");
> +	if (ret < 0 && ret == -ENODEV)
> +		return dev_err_probe(dev, ret, "failed to get REFIN voltage\n");
> +

ret != -ENODEV right?

- Nuno Sá