linux-kernel - Re: [PATCH v2 3/5] iio: adc: ad7292: use devm_regulator_get_enable_read

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Date: Sat, 15 Jun 2024 13:14:19 +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 3/5] iio: adc: ad7292: use
 devm_regulator_get_enable_read_voltage

On Fri, 14 Jun 2024 10:16:26 -0500
David Lechner <dlechner@...libre.com> wrote:

> On 6/14/24 10:11 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:
> >> * avoid else in return value check
> >> * use macro instead of comment to document internal reference voltage
> >> ---
> >>  drivers/iio/adc/ad7292.c | 36 ++++++------------------------------
> >>  1 file changed, 6 insertions(+), 30 deletions(-)
> >>
> >> diff --git a/drivers/iio/adc/ad7292.c b/drivers/iio/adc/ad7292.c
> >> index 6aadd14f459d..87ffe66058a1 100644
> >> --- a/drivers/iio/adc/ad7292.c
> >> +++ b/drivers/iio/adc/ad7292.c
> >> @@ -17,6 +17,8 @@
> >>  
> >>  #define ADI_VENDOR_ID 0x0018
> >>  
> >> +#define AD7292_INTERNAL_REF_MV 1250
> >> +
> >>  /* AD7292 registers definition */
> >>  #define AD7292_REG_VENDOR_ID		0x00
> >>  #define AD7292_REG_CONF_BANK		0x05
> >> @@ -79,7 +81,6 @@ static const struct iio_chan_spec ad7292_channels_diff[] = {
> >>  
> >>  struct ad7292_state {
> >>  	struct spi_device *spi;
> >> -	struct regulator *reg;
> >>  	unsigned short vref_mv;
> >>  
> >>  	__be16 d16 __aligned(IIO_DMA_MINALIGN);
> >> @@ -250,13 +251,6 @@ static const struct iio_info ad7292_info = {
> >>  	.read_raw = ad7292_read_raw,
> >>  };
> >>  
> >> -static void ad7292_regulator_disable(void *data)
> >> -{
> >> -	struct ad7292_state *st = data;
> >> -
> >> -	regulator_disable(st->reg);
> >> -}
> >> -
> >>  static int ad7292_probe(struct spi_device *spi)
> >>  {
> >>  	struct ad7292_state *st;
> >> @@ -277,29 +271,11 @@ static int ad7292_probe(struct spi_device *spi)
> >>  		return -EINVAL;
> >>  	}
> >>  
> >> -	st->reg = devm_regulator_get_optional(&spi->dev, "vref");
> >> -	if (!IS_ERR(st->reg)) {
> >> -		ret = regulator_enable(st->reg);
> >> -		if (ret) {
> >> -			dev_err(&spi->dev,
> >> -				"Failed to enable external vref supply\n");
> >> -			return ret;
> >> -		}
> >> -
> >> -		ret = devm_add_action_or_reset(&spi->dev,
> >> -					       ad7292_regulator_disable, st);
> >> -		if (ret)
> >> -			return ret;
> >> -
> >> -		ret = regulator_get_voltage(st->reg);
> >> -		if (ret < 0)
> >> -			return ret;
> >> +	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");
> >> +	if (ret < 0 && ret == -ENODEV)  
> > 
> > ret != -ENODEV?  
> 
> yup, I messed this one up
Fixed up whilst applying.  Applied
> 
> > 
> > - Nuno Sá
> >   
>