linux-kernel - Re: [PATCH v3 2/2] iio: tsl2772: Use regulator_bulk

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Date:   Wed, 31 Jul 2019 18:48:57 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     Brian Masney <masneyb@...tation.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] iio: tsl2772: Use regulator_bulk_() APIs

Brian Masney <masneyb@...tation.org> 于2019年7月31日周三 下午5:40写道：
>
> Hi Chuhong,
>
> On Wed, Jul 31, 2019 at 11:04:23AM +0800, Chuhong Yuan wrote:
> > Use regulator_bulk_() APIs to shrink driver size.
> >
> > Signed-off-by: Chuhong Yuan <hslester96@...il.com>
>
> Just a few minor nitpicks below. Overall, this is looking nice.
>
> > ---
> > Changes in v3:
> >   - Split v2 into two patches.
> >   - Add dev_err to log error messages.
> >   - Add a check for EPROBE_DEFER.
> >
> >  drivers/iio/light/tsl2772.c | 82 +++++++++++--------------------------
> >  1 file changed, 24 insertions(+), 58 deletions(-)
> >
> > diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
> > index f1134f183be7..fd6d44297dba 100644
> > --- a/drivers/iio/light/tsl2772.c
> > +++ b/drivers/iio/light/tsl2772.c
> > @@ -134,6 +134,12 @@ enum {
> >       TSL2772_CHIP_SUSPENDED = 2
> >  };
> >
> > +enum {
> > +     TSL2772_SUPPLY_VDD = 0,
> > +     TSL2772_SUPPLY_VDDIO = 1,
> > +     TSL2772_NUM_SUPPLIES = 2
> > +};
> > +
> >  /* Per-device data */
> >  struct tsl2772_als_info {
> >       u16 als_ch0;
> > @@ -161,8 +167,7 @@ struct tsl2772_chip {
> >       struct mutex prox_mutex;
> >       struct mutex als_mutex;
> >       struct i2c_client *client;
> > -     struct regulator *vdd_supply;
> > -     struct regulator *vddio_supply;
> > +     struct regulator_bulk_data reg[TSL2772_NUM_SUPPLIES];
>
> I prefer that this was named something other than 'reg'. Maybe
> 'supplies'? I know that there are a few other drivers in IIO that use
> this name.
>

I have used grep "regulator_bulk_data" in drivers/iio but find no variable
is named "supplies"...

> >       u16 prox_data;
> >       struct tsl2772_als_info als_cur_info;
> >       struct tsl2772_settings settings;
> > @@ -697,46 +702,7 @@ static void tsl2772_disable_regulators_action(void *_data)
> >  {
> >       struct tsl2772_chip *chip = _data;
> >
> > -     regulator_disable(chip->vdd_supply);
> > -     regulator_disable(chip->vddio_supply);
> > -}
> > -
> > -static int tsl2772_enable_regulator(struct tsl2772_chip *chip,
> > -                                 struct regulator *regulator)
> > -{
> > -     int ret;
> > -
> > -     ret = regulator_enable(regulator);
> > -     if (ret < 0) {
> > -             dev_err(&chip->client->dev, "Failed to enable regulator: %d\n",
> > -                     ret);
> > -             return ret;
> > -     }
> > -
> > -     return 0;
> > -}
> > -
> > -static struct regulator *tsl2772_get_regulator(struct tsl2772_chip *chip,
> > -                                            char *name)
> > -{
> > -     struct regulator *regulator;
> > -     int ret;
> > -
> > -     regulator = devm_regulator_get(&chip->client->dev, name);
> > -     if (IS_ERR(regulator)) {
> > -             if (PTR_ERR(regulator) != -EPROBE_DEFER)
> > -                     dev_err(&chip->client->dev,
> > -                             "Failed to get %s regulator %d\n",
> > -                             name, (int)PTR_ERR(regulator));
> > -
> > -             return regulator;
> > -     }
> > -
> > -     ret = tsl2772_enable_regulator(chip, regulator);
> > -     if (ret < 0)
> > -             return ERR_PTR(ret);
> > -
> > -     return regulator;
> > +     regulator_bulk_disable(ARRAY_SIZE(chip->reg), chip->reg);
> >  }
> >
> >  static int tsl2772_chip_on(struct iio_dev *indio_dev)
> > @@ -1804,14 +1770,21 @@ static int tsl2772_probe(struct i2c_client *clientp,
> >       chip->client = clientp;
> >       i2c_set_clientdata(clientp, indio_dev);
> >
> > -     chip->vddio_supply = tsl2772_get_regulator(chip, "vddio");
> > -     if (IS_ERR(chip->vddio_supply))
> > -             return PTR_ERR(chip->vddio_supply);
> > +     chip->reg[TSL2772_SUPPLY_VDD].supply = "vdd";
> > +     chip->reg[TSL2772_SUPPLY_VDDIO].supply = "vddio";
> >
> > -     chip->vdd_supply = tsl2772_get_regulator(chip, "vdd");
> > -     if (IS_ERR(chip->vdd_supply)) {
> > -             regulator_disable(chip->vddio_supply);
> > -             return PTR_ERR(chip->vdd_supply);
> > +     ret = devm_regulator_bulk_get(&clientp->dev, ARRAY_SIZE(chip->reg),
> > +                                                             chip->reg);
>
> This needs to be aligned with devm_regulator_bulk_get, not ARRAY_SIZE.
>
> > +     if (ret < 0) {
> > +             if (ret != -EPROBE_DEFER)
> > +                     dev_err(&clientp->dev, "Failed to get regulators: %d\n", ret);
>
> Add newline.
>
> Brian