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

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Message-ID: <2132818.BxtBPRaDeS@acerlaptop>
Date:   Fri, 14 Dec 2018 16:11:49 +0100
From:   Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     nick@...anahar.org, robh+dt@...nel.org, mark.rutland@....com,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/3] Input: atmel_mxt_ts: Add support for  optional regulators

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@...il.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.
> 
>