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Message-ID: <20180123101055.28c4786a@dell-desktop.home>
Date: Tue, 23 Jan 2018 10:10:55 +0100
From: Mylene Josserand <mylene.josserand@...e-electrons.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Russell King - ARM Linux <linux@...linux.org.uk>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Chen-Yu Tsai <wens@...e.org>,
linux-arm-kernel@...ts.infradead.org,
"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
devicetree@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Quentin Schulz <quentin.schulz@...e-electrons.com>
Subject: Re: [PATCH v2 1/2] Input: edt-ft5x06 - Add support for regulator
Hello Dimitry,
Thank you for the review!
Le Mon, 22 Jan 2018 09:42:08 -0800,
Dmitry Torokhov <dmitry.torokhov@...il.com> a écrit :
> 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);
> > + return error;
> > + };
>
> As 0-day pounted out, this semicolon is not needed.
Yes, thanks, I will fix that in next version.
>
> > +
> > + if (tsdata->vcc) {
>
> You do not need to check for non-NULL here, devm_regulator_get() wil
> lnever give you a NULL. If regulator is not defined in DT/board
> mappings, then dummy regulator will be provided. You can call
> regulator_enable() and regulator_disable() and other regulator APIs
> with dummy regulator.
Okay, thanks for the explanation, I will remove that.
>
> > + error = regulator_enable(tsdata->vcc);
> > + if (error < 0) {
> > + dev_err(&client->dev, "failed to enable vcc: %d\n",
> > + error);
> > + return error;
> > + }
> > + }
> > +
> > tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
> > "reset", GPIOD_OUT_HIGH);
> > if (IS_ERR(tsdata->reset_gpio)) {
> > @@ -1122,20 +1141,34 @@ static int edt_ft5x06_ts_remove(struct i2c_client *client)
> > static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
> > {
> > struct i2c_client *client = to_i2c_client(dev);
> > + struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
> >
> > if (device_may_wakeup(dev))
> > enable_irq_wake(client->irq);
> >
> > + if (tsdata->vcc)
>
> Same here.
yep
>
> > + regulator_disable(tsdata->vcc);
> > +
> > return 0;
> > }
> >
> > static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
> > {
> > struct i2c_client *client = to_i2c_client(dev);
> > + struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
> > + int ret;
> >
> > if (device_may_wakeup(dev))
> > disable_irq_wake(client->irq);
> >
> > + if (tsdata->vcc) {
>
> And here.
yep
>
> > + ret = regulator_enable(tsdata->vcc);
> > + if (ret < 0) {
> > + dev_err(dev, "failed to enable vcc: %d\n", ret);
> > + return ret;
> > + }
>
> Since power to the device may have been cut, I think you need to
> restore the register settings to whatever it was (factory vs work
> mode, threshold, gain and offset registers, etc, etc).
Okay. Could you tell me how can I do that?
>
> > + }
> > +
> > return 0;
> > }
> >
> > --
> > 2.11.0
> >
>
> Thanks.
>
About your V2's review, you suggested to add support for wake/reset in
suspend/resume (that I forgot in this version). I wanted to add it but
with my board, I can't test suspend/resume. What should I do about
that?
If I send a V3 in next few days, do you think you will have time to
merge it for v4.16?
Thank you in advance,
Best regards,
Mylène
--
Mylène Josserand, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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