Re: [PATCH v3 12/14] iio: max1241: simplify using devm_regulator_get_enable()

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 19 Aug 2022 22:58:45 +0300
Alexandru Lazar <alazar@startmail.com> wrote:

> Heya,
> 
> I don't have the hardware at hand (long story, lots of smoke), so all I 
> can do for this patch at the moment is:
> 
> Acked-by: Alexandru Lazar <alazar@startmail.com>
> 
> That being said, IIRC the MAX1241 has no special requirements in this 
> regard, so if other SPI devices work, this one ought to work as well. If 
> anyone's concerned, I can test it, but probably not sooner than a week 
> or so :-(.
> 
> FWIW I really like this, the straightforward regulator boilerplate 
> always felt a tad wrong.
> 
> All the best,
> Alex

Now the dependencies are upstream... Applied to the togreg branch of
iio.git and pushed out as testing so that 0-day can play with it and
because I plan to rebase that tree on rc1 sometime shortly.

Jonathan

> 
> On 8/19/2022 10:20 PM, Matti Vaittinen wrote:
> > Drop open-coded pattern: 'devm_regulator_get(), regulator_enable(),
> > add_action_or_reset(regulator_disable)' and use the
> > devm_regulator_get_enable() and drop the pointer to the regulator.
> > This simplifies code and makes it less tempting to add manual control
> > for the regulator which is also controlled by devm.
> > 
> > Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
> > 
> > ---
> > v2 => v3:
> > New patch
> > ---
> >   drivers/iio/adc/max1241.c | 28 +++-------------------------
> >   1 file changed, 3 insertions(+), 25 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/max1241.c b/drivers/iio/adc/max1241.c
> > index a815ad1f6913..500bb09ab19b 100644
> > --- a/drivers/iio/adc/max1241.c
> > +++ b/drivers/iio/adc/max1241.c
> > @@ -22,7 +22,6 @@ enum max1241_id {
> >   struct max1241 {
> >   	struct spi_device *spi;
> >   	struct mutex lock;
> > -	struct regulator *vdd;
> >   	struct regulator *vref;
> >   	struct gpio_desc *shutdown;
> >   
> > @@ -110,17 +109,6 @@ static const struct iio_info max1241_info = {
> >   	.read_raw = max1241_read_raw,
> >   };
> >   
> > -static void max1241_disable_vdd_action(void *data)
> > -{
> > -	struct max1241 *adc = data;
> > -	struct device *dev = &adc->spi->dev;
> > -	int err;
> > -
> > -	err = regulator_disable(adc->vdd);
> > -	if (err)
> > -		dev_err(dev, "could not disable vdd regulator.\n");
> > -}
> > -
> >   static void max1241_disable_vref_action(void *data)
> >   {
> >   	struct max1241 *adc = data;
> > @@ -147,20 +135,10 @@ static int max1241_probe(struct spi_device *spi)
> >   	adc->spi = spi;
> >   	mutex_init(&adc->lock);
> >   
> > -	adc->vdd = devm_regulator_get(dev, "vdd");
> > -	if (IS_ERR(adc->vdd))
> > -		return dev_err_probe(dev, PTR_ERR(adc->vdd),
> > -				     "failed to get vdd regulator\n");
> > -
> > -	ret = regulator_enable(adc->vdd);
> > +	ret = devm_regulator_get_enable(dev, "vdd");
> >   	if (ret)
> > -		return ret;
> > -
> > -	ret = devm_add_action_or_reset(dev, max1241_disable_vdd_action, adc);
> > -	if (ret) {
> > -		dev_err(dev, "could not set up vdd regulator cleanup action\n");
> > -		return ret;
> > -	}
> > +		return dev_err_probe(dev, ret,
> > +				     "failed to get/enable vdd regulator\n");
> >   
> >   	adc->vref = devm_regulator_get(dev, "vref");
> >   	if (IS_ERR(adc->vref))