linux-kernel - Re: [PATCH] Input: st1232 - Support power supply regulators

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Date:   Thu, 2 Jun 2022 08:38:55 -0500
From:   Rob Herring <robh@...nel.org>
To:     Mike Looijmans <mike.looijmans@...ic.nl>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
        krzysztof.kozlowski+dt@...aro.org, martink@...teo.de,
        geert+renesas@...der.be, john@...anate.com, hechtb@...il.com
Subject: Re: [PATCH] Input: st1232 - Support power supply regulators

On Tue, May 24, 2022 at 10:12:16AM +0200, Mike Looijmans wrote:
> Add support for the VDD and IOVDD power supply inputs. This allows the
> chip to share its supplies with other components (e.g. panel) and manage
> them.
> 
> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
> ---
>  .../input/touchscreen/sitronix,st1232.yaml    |  6 +++

Separate patch please.

>  drivers/input/touchscreen/st1232.c            | 54 ++++++++++++++++---
>  2 files changed, 52 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/sitronix,st1232.yaml b/Documentation/devicetree/bindings/input/touchscreen/sitronix,st1232.yaml
> index 1d8ca19fd37a..240be8d49232 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/sitronix,st1232.yaml
> +++ b/Documentation/devicetree/bindings/input/touchscreen/sitronix,st1232.yaml
> @@ -28,6 +28,12 @@ properties:
>      description: A phandle to the reset GPIO
>      maxItems: 1
>  
> +  vdd-supply:
> +    description: Power supply regulator for the chip
> +
> +  vddio-supply:
> +    description: Power supply regulator for the I2C bus
> +
>  required:
>    - compatible
>    - reg
> diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
> index e38ba3e4f183..d9c9f6f1f11a 100644
> --- a/drivers/input/touchscreen/st1232.c
> +++ b/drivers/input/touchscreen/st1232.c
> @@ -44,6 +44,11 @@
>  #define REG_XY_COORDINATES	0x12
>  #define ST_TS_MAX_FINGERS	10
>  
> +enum st1232_regulators {
> +	ST1232_REGULATOR_VDD,
> +	ST1232_REGULATOR_IOVDD,
> +};
> +
>  struct st_chip_info {
>  	bool	have_z;
>  	u16	max_area;
> @@ -56,6 +61,7 @@ struct st1232_ts_data {
>  	struct touchscreen_properties prop;
>  	struct dev_pm_qos_request low_latency_req;
>  	struct gpio_desc *reset_gpio;
> +	struct regulator_bulk_data regulators[2];
>  	const struct st_chip_info *chip_info;
>  	int read_buf_len;
>  	u8 *read_buf;
> @@ -197,17 +203,36 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
> +static int st1232_ts_power_on(struct st1232_ts_data *ts)
> +{
> +	int err;
> +
> +	err = regulator_bulk_enable(ARRAY_SIZE(ts->regulators), ts->regulators);
> +	if (err)
> +		return err;
> +
> +	usleep_range(5000, 6000);
> +
> +	if (ts->reset_gpio)
> +		gpiod_set_value_cansleep(ts->reset_gpio, 0);
> +
> +	return 0;
> +}
> +
> +static void st1232_ts_power_off(struct st1232_ts_data *ts)
>  {
>  	if (ts->reset_gpio)
> -		gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
> +		gpiod_set_value_cansleep(ts->reset_gpio, 1);
> +	usleep_range(100, 150);
> +	regulator_bulk_disable(ARRAY_SIZE(ts->regulators), ts->regulators);
>  }
>  
> -static void st1232_ts_power_off(void *data)
> +static void st1232_ts_power_off_action(void *data)
>  {
> -	st1232_ts_power(data, false);
> +	st1232_ts_power_off(data);
>  }
>  
> +
>  static const struct st_chip_info st1232_chip_info = {
>  	.have_z		= true,
>  	.max_area	= 0xff,
> @@ -266,6 +291,14 @@ static int st1232_ts_probe(struct i2c_client *client,
>  	ts->client = client;
>  	ts->input_dev = input_dev;
>  
> +	ts->regulators[ST1232_REGULATOR_VDD].supply = "vdd";
> +	ts->regulators[ST1232_REGULATOR_IOVDD].supply = "iovdd";
> +	error = devm_regulator_bulk_get(&client->dev,
> +					ARRAY_SIZE(ts->regulators),
> +					ts->regulators);
> +	if (error)
> +		return error;
> +
>  	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
>  						 GPIOD_OUT_HIGH);
>  	if (IS_ERR(ts->reset_gpio)) {
> @@ -275,9 +308,14 @@ static int st1232_ts_probe(struct i2c_client *client,
>  		return error;
>  	}
>  
> -	st1232_ts_power(ts, true);
> +	error = st1232_ts_power_on(ts);
> +	if (error) {
> +		dev_err(&client->dev, "Failed to power on: %d\n", error);
> +		return error;
> +	}
>  
> -	error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);
> +	error = devm_add_action_or_reset(&client->dev,
> +					 st1232_ts_power_off_action, ts);
>  	if (error) {
>  		dev_err(&client->dev,
>  			"Failed to install power off action: %d\n", error);
> @@ -348,7 +386,7 @@ static int __maybe_unused st1232_ts_suspend(struct device *dev)
>  	disable_irq(client->irq);
>  
>  	if (!device_may_wakeup(&client->dev))
> -		st1232_ts_power(ts, false);
> +		st1232_ts_power_off(ts);
>  
>  	return 0;
>  }
> @@ -359,7 +397,7 @@ static int __maybe_unused st1232_ts_resume(struct device *dev)
>  	struct st1232_ts_data *ts = i2c_get_clientdata(client);
>  
>  	if (!device_may_wakeup(&client->dev))
> -		st1232_ts_power(ts, true);
> +		st1232_ts_power_on(ts);
>  
>  	enable_irq(client->irq);
>  
> -- 
> 2.17.1
> 
>