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Message-ID: <20180807085944.337bf20b@dell-desktop.home>
Date: Tue, 7 Aug 2018 08:59:44 +0200
From: Mylène Josserand <mylene.josserand@...tlin.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: robh+dt@...nel.org, mark.rutland@....com,
maxime.ripard@...tlin.com, wens@...e.org,
linux-input@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
thomas.petazzoni@...tlin.com
Subject: Re: [PATCH v4 1/3] Input: edt-ft5x06 - Add support for regulator
Hello Dmitry,
Thank you again for the review.
On Wed, 25 Jul 2018 17:47:32 -0700
Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> Hi Mylène,
>
> On Wed, Jul 25, 2018 at 09:34:08AM +0200, Mylène Josserand wrote:
> > Add the support of regulator to use it as VCC source.
> >
> > Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
> > Reviewed-by: Rob Herring <robh@...nel.org>
> > ---
> > .../bindings/input/touchscreen/edt-ft5x06.txt | 1 +
> > drivers/input/touchscreen/edt-ft5x06.c | 43 ++++++++++++++++++++++
> > 2 files changed, 44 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 1e18ca0d1b4e..dcde719094f7 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;
> > @@ -963,6 +965,13 @@ edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
> > }
> > }
> >
> > +static void edt_ft5x06_disable_regulator(void *arg)
> > +{
> > + struct edt_ft5x06_ts_data *data = arg;
> > +
> > + regulator_disable(data->vcc);
> > +}
> > +
> > static int edt_ft5x06_ts_probe(struct i2c_client *client,
> > const struct i2c_device_id *id)
> > {
> > @@ -991,6 +1000,28 @@ 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);
> > + if (error != -EPROBE_DEFER)
> > + dev_err(&client->dev, "failed to request regulator: %d\n",
> > + error);
> > + return error;
> > + }
> > +
> > + error = regulator_enable(tsdata->vcc);
> > + if (error < 0) {
> > + dev_err(&client->dev, "failed to enable vcc: %d\n",
> > + error);
> > + return error;
> > + }
>
> It is better to put the chip into reset and then power up the regulatori
> and take it out of the reset, rather than power up and then toggle reset
> on and off.
okay, thanks, I will update it.
>
> > +
> > + error = devm_add_action_or_reset(&client->dev,
> > + edt_ft5x06_disable_regulator,
> > + tsdata);
> > + if (error)
> > + return error;
> > +
> > tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
> > "reset", GPIOD_OUT_HIGH);
> > if (IS_ERR(tsdata->reset_gpio)) {
> > @@ -1120,9 +1151,12 @@ 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);
> > + else
> > + regulator_disable(tsdata->vcc);
> >
> > return 0;
> > }
> > @@ -1130,9 +1164,18 @@ static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
> > 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);
> > + else {
> > + ret = regulator_enable(tsdata->vcc);
> > + if (ret < 0) {
> > + dev_err(dev, "failed to enable vcc: %d\n", ret);
> > + return ret;
> > + }
> > + }
>
> I believe I mentioned in other review that once you powered up the
> device, you need to restore its settings, include switching to factory
> mode, if it was in factory mode, and restoring threshold/gain/offset
> settings.
Yes, I will update the driver with that but as I told you in a previous
mail, I can't test the suspend/resume :(
Best regards,
--
Mylène Josserand, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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