linux-kernel - Re: [PATCH v2 1/2] Input: edt-ft5x06

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Date:   Tue, 23 Jan 2018 09:04:14 +0100
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Mylène Josserand 
        <mylene.josserand@...e-electrons.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        lkml <linux-kernel@...r.kernel.org>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] Input: edt-ft5x06 - Add support for regulator

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@...e-electrons.com> wrote:
> > Add the support of regulator to use it as VCC source.
> >
> > Signed-off-by: Mylène Josserand <mylene.josserand@...e-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