linux-kernel - Re: [Patch v2 2/7] Regulator: DA9055 Regulator driver

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Date:	Tue, 9 Oct 2012 16:11:11 +0900
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ashish Jangam <ashish.jangam@...tcummins.com>
Cc:	Liam Girdwood <lrg@...com>, Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, David Dajun Chen <dchen@...semi.com>
Subject: Re: [Patch v2 2/7] Regulator: DA9055 Regulator driver

On Mon, Oct 08, 2012 at 07:00:39PM +0530, Ashish Jangam wrote:

Mostly OK, but there's a few issues including yet more reimplementation
of framework features.

> +static int da9055_list_voltage(struct regulator_dev *rdev,
> +				unsigned int selector)
> +{
> +	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
> +	struct da9055_regulator_info *info = regulator->info;
> +	int volt_uV;
> +
> +	volt_uV = (selector * info->step_uV) + info->min_uV;
> +
> +	if (volt_uV > info->max_uV)
> +		return -EINVAL;
> +
> +	return volt_uV;
> +}

This is regulator_list_voltage_linear()

> +static int da9055_map_voltage(struct regulator_dev *rdev,
> +			      int min_uV, int max_uV)
> +{
> +	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
> +	struct da9055_regulator_info *info = regulator->info;
> +	int ret, sel;
> +
> +	ret = verify_range(info, min_uV, max_uV);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (min_uV < info->min_uV)
> +		min_uV = info->min_uV;
> +
> +	sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
> +
> +	ret = da9055_list_voltage(rdev, sel);
> +	if (ret < 0)
> +		return ret;
> +
> +	return sel;
> +}

This is regulator_map_voltage_linear().

> +             int gpio = pdata->gpio_base + pdata->gpio_ren[id];

> +		sprintf(name, "DA9055 REG %d STATE", id);

snprintf().

> +		/* Set the GPIO I/P pin for controlling the regulator state. */
> +		ret = devm_gpio_request_one(config->dev, gpio, GPIOF_DIR_IN,
> +					    name);
> +		if (ret < 0)
> +			goto err;

We never actually appear to use this GPIO anywhere...  why are we
requesting it?  Also, why is the ability to read the regulator state via
a GPIO associated with controlling it via a GPIO, it's unusual for these
things to be tied together.
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