linux-kernel - Re: [PATCH v11 4/4] power: supply: bq25150 introduce the bq25150

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Message-ID: <95fcf5ae-cf49-4618-08cc-da7487450e53@ti.com>
Date:   Thu, 28 May 2020 10:43:05 -0400
From:   "Andrew F. Davis" <afd@...com>
To:     Ricardo Rivera-Matos <r-rivera-matos@...com>, <sre@...nel.org>,
        <pali@...nel.org>, <robh@...nel.org>
CC:     <dmurphy@...com>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <sspatil@...roid.com>
Subject: Re: [PATCH v11 4/4] power: supply: bq25150 introduce the bq25150

On 5/28/20 10:05 AM, Ricardo Rivera-Matos wrote:
> +static int bq2515x_set_precharge_current(struct bq2515x_device *bq2515x,
> +					int val)
> +{
> +	int ret;
> +	unsigned int pchrgctrl;
> +	unsigned int icharge_range;
> +	unsigned int precharge_reg_code;
> +	u16 precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
> +	u16 precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_1875_UA;


Why u16? looks like it gets promoted everywhere it's used anyway.


> +
> +	ret = regmap_read(bq2515x->regmap, BQ2515X_PCHRGCTRL, &pchrgctrl);
> +	if (ret)
> +		return ret;
> +
> +	icharge_range = pchrgctrl & BQ2515X_ICHARGE_RANGE;
> +
> +	if (icharge_range) {
> +		precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_3750_UA;
> +		precharge_multiplier = BQ2515X_ICHG_RNG_1B1_UA;

This is a little hard to read when we have a default value overwritten
in an if, it basically hides the else logic, suggest:


if (icharge_range) {
	precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_3750_UA;
	precharge_multiplier = BQ2515X_ICHG_RNG_1B1_UA;
} else {
	precharge_max_ua = BQ2515X_PRECHRG_ICHRG_RNGE_1875_UA;
	precharge_multiplier = BQ2515X_ICHG_RNG_1B0_UA;
}


> +	}
> +	if (val > precharge_max_ua || val < BQ2515X_ICHG_MIN_UA)
> +		return -EINVAL;
> +
> +	precharge_reg_code = val / precharge_multiplier;
> +
> +	ret = bq2515x_set_charge_disable(bq2515x, 1);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_update_bits(bq2515x->regmap, BQ2515X_PCHRGCTRL,
> +				BQ2515X_PRECHARGE_MASK, precharge_reg_code);
> +	if (ret)
> +		return ret;
> +
> +	return bq2515x_set_charge_disable(bq2515x, 0);
> +}

[snip]

> +
> +static int bq2515x_set_ilim_lvl(struct bq2515x_device *bq2515x, int val)
> +{
> +	int i = 0;
> +	unsigned int array_size = ARRAY_SIZE(bq2515x_ilim_lvl_values);
> +
> +	if (val >= bq2515x_ilim_lvl_values[array_size - 1]) {


Isn't this check the same as is done in first iteration of the below loop?

Andrew


> +		i = array_size - 1;
> +	} else {
> +		for (i = array_size - 1; i > 0; i--) {
> +			if (val >= bq2515x_ilim_lvl_values[i])
> +				break;
> +		}
> +	}
> +	return regmap_write(bq2515x->regmap, BQ2515X_ILIMCTRL, i);
> +}
> +