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Date:   Tue, 23 Jan 2018 10:13:35 +0100
From:   Mylene Josserand <mylene.josserand@free-electrons.com>
To:     Lothar =?UTF-8?B?V2HDn21hbm4=?= <LW@KARO-electronics.de>
Cc:     Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Mark Rutland <mark.rutland@arm.com>,
        devicetree@vger.kernel.org,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        lkml <linux-kernel@vger.kernel.org>,
        Quentin Schulz <quentin.schulz@free-electrons.com>,
        Chen-Yu Tsai <wens@csie.org>, Rob Herring <robh+dt@kernel.org>,
        "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>,
        Maxime Ripard <maxime.ripard@free-electrons.com>,
        Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 1/2] Input: edt-ft5x06 - Add support for regulator
Message-ID: <20180123101335.205681d3@dell-desktop.home>
In-Reply-To: <20180123090414.47bcf118@karo-electronics.de>
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        <CAKdAkRQme1Y+t4qxLGOFojEji1L6z3L0XS4+W0FdQ36-2hxW=A@mail.gmail.com>
        <20180123090414.47bcf118@karo-electronics.de>
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Hello Lothar,

Le Tue, 23 Jan 2018 09:04:14 +0100,
Lothar Waßmann <LW@KARO-electronics.de> a écrit :

> Hi,
> 
> On Mon, 22 Jan 2018 09:42:08 -0800 Dmitry Torokhov wrote:
> > Hi Mylène,
> > 
> > On Thu, Dec 28, 2017 at 8:33 AM, Mylène Josserand
> > <mylene.josserand@free-electrons.com> wrote:  
> > > Add the support of regulator to use it as VCC source.
> > >
> > > Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
> > > ---
> > >  .../bindings/input/touchscreen/edt-ft5x06.txt      |  1 +
> > >  drivers/input/touchscreen/edt-ft5x06.c             | 33 ++++++++++++++++++++++
> > >  2 files changed, 34 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> > > index 025cf8c9324a..48e975b9c1aa 100644
> > > --- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> > > +++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> > > @@ -30,6 +30,7 @@ Required properties:
> > >  Optional properties:
> > >   - reset-gpios: GPIO specification for the RESET input
> > >   - wake-gpios:  GPIO specification for the WAKE input
> > > + - vcc-supply:  Regulator that supplies the touchscreen
> > >
> > >   - pinctrl-names: should be "default"
> > >   - pinctrl-0:   a phandle pointing to the pin settings for the
> > > diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
> > > index c53a3d7239e7..5ee14a25a382 100644
> > > --- a/drivers/input/touchscreen/edt-ft5x06.c
> > > +++ b/drivers/input/touchscreen/edt-ft5x06.c
> > > @@ -39,6 +39,7 @@
> > >  #include <linux/input/mt.h>
> > >  #include <linux/input/touchscreen.h>
> > >  #include <linux/of_device.h>
> > > +#include <linux/regulator/consumer.h>
> > >
> > >  #define WORK_REGISTER_THRESHOLD                0x00
> > >  #define WORK_REGISTER_REPORT_RATE      0x08
> > > @@ -91,6 +92,7 @@ struct edt_ft5x06_ts_data {
> > >         struct touchscreen_properties prop;
> > >         u16 num_x;
> > >         u16 num_y;
> > > +       struct regulator *vcc;
> > >
> > >         struct gpio_desc *reset_gpio;
> > >         struct gpio_desc *wake_gpio;
> > > @@ -993,6 +995,23 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
> > >
> > >         tsdata->max_support_points = chip_data->max_support_points;
> > >
> > > +       tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
> > > +       if (IS_ERR(tsdata->vcc)) {
> > > +               error = PTR_ERR(tsdata->vcc);
> > > +               dev_err(&client->dev, "failed to request regulator: %d\n",
> > > +                       error);  
> >  
> I would check for -EPROBE_DEFER here and omit the error message in this
> case.
> 
> 
> Lothar Waßmann

Sure, I will add this case, thank you for the review.

Best regards,

-- 
Mylène Josserand, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com