Re: [PATCH v4 1/3] Input: atmel_mxt_ts: Add support for optional regulators

Paweł Chmiel
2018-12-14T15:11:49Z

Dnia niedziela, 9 grudnia 2018 05:26:12 CET Dmitry Torokhov pisze:
> On Fri, Dec 07, 2018 at 03:28:55PM +0100, Paweł Chmiel wrote:
> > This patch adds optional regulators, which can be used to power
> > up touchscreen. After enabling regulators, we need to wait 150msec.
> > This value is taken from official driver.
> >
> > It was tested on Samsung Galaxy i9000 (based on Samsung S5PV210 SOC).
> >
> > Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> > ---
> > Changes from v3:
> > - Fix checkpatch issues
> > - Drop sentence punctuation from subject of one of patches
> >
> > Changes from v2:
> > - Move code enabling regulators into separate method,
> > to make code more readable.
> >
> > Changes from v1:
> > - Enable regulators only if reset_gpio is present.
> > - Switch from devm_regulator_get_optional to devm_regulator_get
> > ---
> > drivers/input/touchscreen/atmel_mxt_ts.c | 65 +++++++++++++++++++++---
> > 1 file changed, 59 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> > index d3aacd534e9c..1dc8ad0da5af 100644
> > --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> > +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> > @@ -27,6 +27,7 @@
> > #include <linux/interrupt.h>
> > #include <linux/of.h>
> > #include <linux/property.h>
> > +#include <linux/regulator/consumer.h>
> > #include <linux/slab.h>
> > #include <linux/gpio/consumer.h>
> > #include <asm/unaligned.h>
> > @@ -194,10 +195,10 @@ enum t100_type {
> >
> > /* Delay times */
> > #define MXT_BACKUP_TIME 50 /* msec */
> > -#define MXT_RESET_GPIO_TIME 20 /* msec */
> > #define MXT_RESET_INVALID_CHG 100 /* msec */
> > #define MXT_RESET_TIME 200 /* msec */
> > #define MXT_RESET_TIMEOUT 3000 /* msec */
> > +#define MXT_REGULATOR_DELAY 150 /* msec */
> > #define MXT_CRC_TIMEOUT 1000 /* msec */
> > #define MXT_FW_RESET_TIME 3000 /* msec */
> > #define MXT_FW_CHG_TIMEOUT 300 /* msec */
> > @@ -323,6 +324,8 @@ struct mxt_data {
> > struct t7_config t7_cfg;
> > struct mxt_dbg dbg;
> > struct gpio_desc *reset_gpio;
> > + struct regulator *vdd_reg;
> > + struct regulator *avdd_reg;
> >
> > /* Cached parameters from object table */
> > u16 T5_address;
> > @@ -3038,6 +3041,38 @@ static const struct dmi_system_id chromebook_T9_suspend_dmi[] = {
> > { }
> > };
> >
> > +static int mxt_regulator_enable(struct mxt_data *data)
> > +{
> > + int error;
> > +
> > + if (data->reset_gpio) {
> > + error = regulator_enable(data->vdd_reg);
> > + if (error) {
> > + dev_err(&data->client->dev,
> > + "Failed to enable vdd regulator: %d\n", error);
> > + return error;
> > + }
> > +
> > + error = regulator_enable(data->avdd_reg);
> > + if (error) {
> > + dev_err(&data->client->dev,
> > + "Failed to enable avdd regulator: %d\n", error);
>
> This leaves vdd regulator enabled.
Will be fixed in v5 version (will be today)
Thanks for review.
>
> Thanks.
>
>