linux-kernel - Re: [PATCH v2 3/3] power: supply: bq24190

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Message-ID: <20230912191416.j6rqwx2vsisu47nl@mercury.elektranox.org>
Date:   Tue, 12 Sep 2023 21:14:16 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
Cc:     Alexandre Courbot <acourbot@...dia.com>,
        azkali <a.ffcc7@...il.com>, CTCaer <ctcaer@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] power: supply: bq24190_charger: Export current
 regulator

Hi,

On Thu, Aug 24, 2023 at 03:13:31PM +0200, Emmanuel Gil Peyrot wrote:
> From: Alexandre Courbot <acourbot@...dia.com>
> 
> This prevents the charger from ever going over the current limit.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> Signed-off-by: Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
> ---

This would need to be documented in the DT binding, but it
duplicates control for POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT
anyways. Please introduce DT property "input-current-limit-microamp"
for this driver, just like e.g. bq2515x_charger.c (and update the DT
binding accordingly).

-- Sebastian

>  drivers/power/supply/bq24190_charger.c | 82 ++++++++++++++++++++++++++
>  1 file changed, 82 insertions(+)
> 
> diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
> index a56122b39687..cc1bd87f4982 100644
> --- a/drivers/power/supply/bq24190_charger.c
> +++ b/drivers/power/supply/bq24190_charger.c
> @@ -530,6 +530,79 @@ static int bq24190_set_otg_vbus(struct bq24190_dev_info *bdi, bool enable)
>  }
>  
>  #ifdef CONFIG_REGULATOR
> +static int bq24190_set_charging_current(struct regulator_dev *dev,
> +			int min_uA, int max_uA)
> +{
> +	struct bq24190_dev_info *bdi = rdev_get_drvdata(dev);
> +	u8 ss_reg;
> +	int in_current_limit;
> +	int ret = 0;
> +
> +	ret = bq24190_read(bdi, BQ24190_REG_SS, &ss_reg);
> +	if (ret < 0)
> +		goto error;
> +
> +	if (max_uA == 0 && ss_reg != 0)
> +		return ret;
> +
> +	if (!(ss_reg & BQ24190_REG_SS_VBUS_STAT_MASK))
> +		in_current_limit = 500;
> +	else
> +		in_current_limit = max_uA / 1000;
> +
> +	return bq24190_set_field_val(bdi, BQ24190_REG_ISC,
> +			BQ24190_REG_ISC_IINLIM_MASK,
> +			BQ24190_REG_ISC_IINLIM_SHIFT,
> +			bq24190_isc_iinlim_values,
> +			ARRAY_SIZE(bq24190_isc_iinlim_values),
> +			in_current_limit);
> +error:
> +	dev_err(bdi->dev, "Charger enable failed, err = %d\n", ret);
> +	return ret;
> +}
> +
> +static const struct regulator_ops bq24190_chrg_ops = {
> +	.set_current_limit = bq24190_set_charging_current,
> +};
> +
> +static const struct regulator_desc bq24190_chrg_desc = {
> +	.name = "charger",
> +	.of_match = "charger",
> +	.type = REGULATOR_CURRENT,
> +	.owner = THIS_MODULE,
> +	.ops = &bq24190_chrg_ops,
> +};
> +
> +static const struct regulator_init_data bq24190_chrg_init_data = {
> +	.constraints = {
> +		.valid_ops_mask = REGULATOR_CHANGE_STATUS | REGULATOR_CHANGE_CURRENT,
> +		.min_uA = 0,
> +		.max_uA = 3000000,
> +	},
> +};
> +
> +static int bq24190_register_chrg_regulator(struct bq24190_dev_info *bdi)
> +{
> +	struct bq24190_platform_data *pdata = bdi->dev->platform_data;
> +	struct regulator_config cfg = { };
> +	struct regulator_dev *reg;
> +	int ret = 0;
> +
> +	cfg.dev = bdi->dev;
> +	if (pdata && pdata->regulator_init_data)
> +		cfg.init_data = pdata->regulator_init_data;
> +	else
> +		cfg.init_data = &bq24190_chrg_init_data;
> +	cfg.driver_data = bdi;
> +	reg = devm_regulator_register(bdi->dev, &bq24190_chrg_desc, &cfg);
> +	if (IS_ERR(reg)) {
> +		ret = PTR_ERR(reg);
> +		dev_err(bdi->dev, "Can't register regulator: %d\n", ret);
> +	}
> +
> +	return ret;
> +}
> +
>  static int bq24190_vbus_enable(struct regulator_dev *dev)
>  {
>  	return bq24190_set_otg_vbus(rdev_get_drvdata(dev), true);
> @@ -611,6 +684,11 @@ static int bq24190_register_vbus_regulator(struct bq24190_dev_info *bdi)
>  	return ret;
>  }
>  #else
> +static int bq24190_register_chrg_regulator(struct bq24190_dev_info *bdi)
> +{
> +	return 0;
> +}
> +
>  static int bq24190_register_vbus_regulator(struct bq24190_dev_info *bdi)
>  {
>  	return 0;
> @@ -1879,6 +1957,10 @@ static int bq24190_probe(struct i2c_client *client)
>  		goto out_charger;
>  	}
>  
> +	ret = bq24190_register_chrg_regulator(bdi);
> +	if (ret < 0)
> +		goto out_charger;
> +
>  	ret = bq24190_register_vbus_regulator(bdi);
>  	if (ret < 0)
>  		goto out_charger;
> -- 
> 2.42.0
> 

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