linux-kernel - Re: [PATCH v1 07/13] iio: chemical: bme680: add regulators

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Message-ID: <20241012125343.729425e5@jic23-huawei>
Date: Sat, 12 Oct 2024 12:53:43 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: vamoirid <vassilisamir@...il.com>
Cc: lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, anshulusr@...il.com, gustavograzs@...il.com,
 andriy.shevchenko@...ux.intel.com, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 07/13] iio: chemical: bme680: add regulators

On Thu, 10 Oct 2024 23:00:24 +0200
vamoirid <vassilisamir@...il.com> wrote:

> From: Vasileios Amoiridis <vassilisamir@...il.com>
> 
> Add support for the regulators described in the dt-binding.
> 
> Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
> ---
>  drivers/iio/chemical/bme680_core.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
> index dedb7edaf43d..a2039b966f20 100644
> --- a/drivers/iio/chemical/bme680_core.c
> +++ b/drivers/iio/chemical/bme680_core.c
> @@ -15,6 +15,7 @@
>  #include <linux/log2.h>
>  #include <linux/module.h>
>  #include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <linux/iio/iio.h>
>  #include <linux/iio/sysfs.h>
> @@ -100,6 +101,12 @@ enum bme680_op_mode {
>  	BME680_FORCED,
>  };
>  
> +static const char *const bme680_supply_names[] = {
> +	"vdd", "vddio"
> +};
> +
> +#define BME680_NUM_SUPPLIES ARRAY_SIZE(bme680_supply_names)
> +
>  struct bme680_data {
>  	struct regmap *regmap;
>  	struct bme680_calib bme680;
> @@ -110,6 +117,8 @@ struct bme680_data {
>  	u16 heater_dur;
>  	u16 heater_temp;
>  
> +	struct regulator_bulk_data supplies[BME680_NUM_SUPPLIES];
> +
>  	union {
>  		u8 buf[3];
>  		unsigned int check;
> @@ -857,6 +866,13 @@ static const struct iio_info bme680_info = {
>  	.attrs = &bme680_attribute_group,
>  };
>  
> +static void bme680_regulators_disable(void *data)
> +{
> +	struct regulator_bulk_data *supplies = data;
> +
> +	regulator_bulk_disable(BME680_NUM_SUPPLIES, supplies);
> +}
> +
>  int bme680_core_probe(struct device *dev, struct regmap *regmap,
>  		      const char *name)
>  {
> @@ -885,6 +901,20 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
>  	data->heater_temp = 320; /* degree Celsius */
>  	data->heater_dur = 150;  /* milliseconds */
>  
> +	regulator_bulk_set_supply_names(data->supplies, bme680_supply_names,
> +					BME680_NUM_SUPPLIES);
> +	ret = devm_regulator_bulk_get(dev, BME680_NUM_SUPPLIES, data->supplies);

devm_regulator_bulk_get_enable() should replace all this with functionally
equivalent code.  You can also have the supplies list local as you don't
then need to hang on to a copy.


> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to get regulators\n");
> +
> +	ret = regulator_bulk_enable(BME680_NUM_SUPPLIES, data->supplies);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to enable regulators\n");
> +
> +	devm_add_action_or_reset(dev, bme680_regulators_disable, data->supplies);

> +
> +	fsleep(BME680_STARTUP_TIME_US);
> +
>  	ret = regmap_write(regmap, BME680_REG_SOFT_RESET, BME680_CMD_SOFTRESET);
>  	if (ret < 0)
>  		return dev_err_probe(dev, ret, "Failed to reset chip\n");