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

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Date: Sat, 15 Jun 2024 13:18:04 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Nuno Sá <noname.nuno@...il.com>, 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 Fri, 14 Jun 2024 10:19:43 -0500
David Lechner <dlechner@...libre.com> wrote:

> On 6/14/24 10:16 AM, Nuno Sá wrote:
> > 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?  
> 
> oof, yeah messed that one too
> 
Fixed up as well and applied.

Enough patches bouncing around that I'd rather clear these little things by
hand than see the patch again :)

Jonathan

> > 
> > - Nuno Sá
> > 
> >   
>