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Subject: Re: [PATCH v2 3/3] power: supply: bq24190_charger: Export current
 regulator
Content-Language: fr, en-US
To:     Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Cc:     Alexandre Courbot <acourbot@nvidia.com>,
        azkali <a.ffcc7@gmail.com>, CTCaer <ctcaer@gmail.com>,
        Sebastian Reichel <sre@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>, linux-pm@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20230824112741.201353-1-linkmauve@linkmauve.fr>
 <20230824131342.206784-1-linkmauve@linkmauve.fr>
 <20230824131342.206784-4-linkmauve@linkmauve.fr>
From:   Christophe JAILLET <christophe.jaillet@wanadoo.fr>
In-Reply-To: <20230824131342.206784-4-linkmauve@linkmauve.fr>
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Le 24/08/2023 à 15:13, Emmanuel Gil Peyrot a écrit :
> From: Alexandre Courbot <acourbot@nvidia.com>
> 
> This prevents the charger from ever going over the current limit.
> 
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
> Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
> ---
>   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;

Nit: Un-needed init.

> +
> +	ret = bq24190_read(bdi, BQ24190_REG_SS, &ss_reg);
> +	if (ret < 0)
> +		goto error;
> +
> +	if (max_uA == 0 && ss_reg != 0)
> +		return ret;

ret is known to be 0 here. If it is the intension, return 0 would be 
more explicit. Otherwise a ret = -<error_code> is missing.

Just my 2c,

CJ

> +
> +	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;
> +}

...