linux-kernel - Re: [PATCH v3] backlight: lp855x: use private data for regulator control

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Date:	Fri, 7 Aug 2015 00:42:56 +0900
From:	"Jingoo Han" <jingoohan1@...il.com>
To:	"'Milo Kim'" <milo.kim@...com>
Cc:	"'Sean Paul'" <seanpaul@...omium.org>,
	"'Lee Jones'" <lee.jones@...aro.org>,
	"'Linux Kernel Mailing List'" <linux-kernel@...r.kernel.org>,
	"'Jingoo Han'" <jingoohan1@...il.com>
Subject: Re: [PATCH v3] backlight: lp855x: use private data for regulator control

On Monday, July 20, 2015 10:31 PM, Sean Paul wrote:
> On Mon, Jul 20, 2015 at 2:45 AM, Milo Kim <milo.kim@...com> wrote:
> > LP855x backlight device can be enabled by external VDD input.
> > The 'supply' data is used for this purpose.
> > It's kind of private data which runs internally, so there is no reason to
> > expose to the platform data.
> >
> > And devm_regulator_get() is moved from _parse_dt() to _probe().
> > Regulator consumer(lp855x) can control regulator not only from DT but also
> > from platform data configuration in a source file such like board-*.c.
> >
> > v2 -> v3:
> >   The 'power' regulator is optional but the driver should check the error,
> >   '-EPROBE_DEFER' and return. It enables to let the driver retry to get
> >   probed.
> >
> > v1 -> v2:
> >   Keeps optional property '<name>-supply' in LP855x DT binding.
> >
> > Cc: Sean Paul <seanpaul@...omium.org>
> > Cc: Jingoo Han <jingoohan1@...il.com>
> > Cc: Lee Jones <lee.jones@...aro.org>
> > Cc: linux-kernel@...r.kernel.org
> > Signed-off-by: Milo Kim <milo.kim@...com>
> 
> Acked-by: Sean Paul <seanpaul@...omium.org>

Acked-by: Jingoo Han <jingoohan1@...il.com>

Best regards,
Jingoo Han

> 
> > ---
> >  drivers/video/backlight/lp855x_bl.c  | 23 ++++++++++++-----------
> >  include/linux/platform_data/lp855x.h |  2 --
> >  2 files changed, 12 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
> > index 88116b4..f88df9e 100644
> > --- a/drivers/video/backlight/lp855x_bl.c
> > +++ b/drivers/video/backlight/lp855x_bl.c
> > @@ -73,6 +73,7 @@ struct lp855x {
> >         struct device *dev;
> >         struct lp855x_platform_data *pdata;
> >         struct pwm_device *pwm;
> > +       struct regulator *supply;       /* regulator for VDD input */
> >  };
> >
> >  static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)
> > @@ -378,13 +379,6 @@ static int lp855x_parse_dt(struct lp855x *lp)
> >                 pdata->rom_data = &rom[0];
> >         }
> >
> > -       pdata->supply = devm_regulator_get(dev, "power");
> > -       if (IS_ERR(pdata->supply)) {
> > -               if (PTR_ERR(pdata->supply) == -EPROBE_DEFER)
> > -                       return -EPROBE_DEFER;
> > -               pdata->supply = NULL;
> > -       }
> > -
> >         lp->pdata = pdata;
> >
> >         return 0;
> > @@ -425,8 +419,15 @@ static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
> >         else
> >                 lp->mode = REGISTER_BASED;
> >
> > -       if (lp->pdata->supply) {
> > -               ret = regulator_enable(lp->pdata->supply);
> > +       lp->supply = devm_regulator_get(lp->dev, "power");
> > +       if (IS_ERR(lp->supply)) {
> > +               if (PTR_ERR(lp->supply) == -EPROBE_DEFER)
> > +                       return -EPROBE_DEFER;
> > +               lp->supply = NULL;
> > +       }
> > +
> > +       if (lp->supply) {
> > +               ret = regulator_enable(lp->supply);
> >                 if (ret < 0) {
> >                         dev_err(&cl->dev, "failed to enable supply: %d\n", ret);
> >                         return ret;
> > @@ -464,8 +465,8 @@ static int lp855x_remove(struct i2c_client *cl)
> >
> >         lp->bl->props.brightness = 0;
> >         backlight_update_status(lp->bl);
> > -       if (lp->pdata->supply)
> > -               regulator_disable(lp->pdata->supply);
> > +       if (lp->supply)
> > +               regulator_disable(lp->supply);
> >         sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);
> >
> >         return 0;
> > diff --git a/include/linux/platform_data/lp855x.h b/include/linux/platform_data/lp855x.h
> > index 9c7fd1e..1b2ba24 100644
> > --- a/include/linux/platform_data/lp855x.h
> > +++ b/include/linux/platform_data/lp855x.h
> > @@ -136,7 +136,6 @@ struct lp855x_rom_data {
> >                 Only valid when mode is PWM_BASED.
> >   * @size_program : total size of lp855x_rom_data
> >   * @rom_data : list of new eeprom/eprom registers
> > - * @supply : regulator that supplies 3V input
> >   */
> >  struct lp855x_platform_data {
> >         const char *name;
> > @@ -145,7 +144,6 @@ struct lp855x_platform_data {
> >         unsigned int period_ns;
> >         int size_program;
> >         struct lp855x_rom_data *rom_data;
> > -       struct regulator *supply;
> >  };
> >
> >  #endif
> > --
> > 1.9.1
> >

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