linux-kernel - Re: [PATCH 1/2] regulator: tps65132: add regulator driver for TI TPS65132

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Date:   Tue, 7 Mar 2017 13:34:12 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Venkat Reddy Talla <vreddytalla@...dia.com>
Cc:     lgirdwood@...il.com, linux-kernel@...r.kernel.org,
        ldewangan@...dia.com
Subject: Re: [PATCH 1/2] regulator: tps65132: add regulator driver for TI
 TPS65132

On Mon, Mar 06, 2017 at 10:06:58PM +0530, Venkat Reddy Talla wrote:

> +	dis_mask = (id == TPS65132_REGULATOR_ID_VPOS) ?
> +			TPS65132_REG_APPS_DISP : TPS65132_REG_APPS_DISN;

Please don't abuse the ternery operator, write normal if statements so
that people can read the code easily.

> +static int tps65132_disable(struct regulator_dev *rdev)
> +{
> +	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
> +	int act_dis_gpio = tps->reg_pdata[id].active_discharge_gpio;
> +	unsigned int act_dis_time_us = tps->reg_pdata[id].active_discharge_time;
> +
> +	if (gpio_is_valid(act_dis_gpio)) {
> +		gpio_set_value_cansleep(act_dis_gpio, 1);
> +		usleep_range(act_dis_time_us,
> +			act_dis_time_us + TPS65132_ACT_DIS_TIME_SLACK);
> +		gpio_set_value_cansleep(act_dis_gpio, 0);
> +	}

Don't we need to undo the active discharge register write?

> +static int tps65132_get_regulator_dt_data(struct device *dev,
> +		struct tps65132_regulator *tps65132_regs)
> +{
> +	struct tps65132_reg_pdata *rpdata;
> +	struct device_node *rnode;
> +	int id;
> +	int ret;
> +
> +	ret = of_regulator_match(dev, dev->of_node, tps65132_regulator_matches,
> +			ARRAY_SIZE(tps65132_regulator_matches));
> +	if (ret < 0) {
> +		dev_err(dev, "node parsing for regulator failed: %d\n", ret);
> +		return ret;
> +	}

Don't open code this, use of_parse_cb() to parse your extra properties.

> +static int __init tps65132_init(void)
> +{
> +	return i2c_add_driver(&tps65132_i2c_driver);
> +}
> +subsys_initcall(tps65132_init);

You should use module_i2c_driver() for new drivers.

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