linux-kernel - Re: [PATCH] regulator: 88pm800: add regulator driver

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Message-ID: <20130522161422.GP1627@sirena.org.uk>
Date:	Wed, 22 May 2013 11:14:22 -0500
From:	Mark Brown <broonie@...nel.org>
To:	yizhang.mrvl@...il.com
Cc:	lgirdwood@...il.com, cxie4@...vell.com, jett.zhou@...vell.com,
	linux-kernel@...r.kernel.org, Yi Zhang <yizhang@...vell.com>
Subject: Re: [PATCH] regulator: 88pm800: add regulator driver

On Wed, May 22, 2013 at 08:10:53PM +0800, yizhang.mrvl@...il.com wrote:

You need a DT binding document for any new DT bindings like this one.

> +static const unsigned int BUCK1_table[] = {
> +	/* 0x00-0x4F: from 0.6 to 1.5875V with step 0.0125V */
> +	/* 0x50-0x7F: from 1.6 to 1.8V with step 0.05V */

Write this out as code, don't use a big table for large sets of
voltages.

> +static int pm800_list_voltage(struct regulator_dev *rdev, unsigned index)
> +{
> +	struct pm800_regulator_info *info = rdev_get_drvdata(rdev);
> +	int ret = -EINVAL;
> +
> +	if (info->vol_table && (index < rdev->desc->n_voltages))
> +		ret = info->vol_table[index];
> +
> +	return ret;
> +}

For things that are just table lookups use the framework helpers.

> +static int choose_voltage(struct regulator_dev *rdev, int min_uv, int max_uv)
> +{

Similarly here.

> +static int pm800_set_voltage(struct regulator_dev *rdev,
> +			     int min_uv, int max_uv, unsigned *sel)
> +{
> +	*sel = choose_voltage(rdev, min_uv, max_uv);
> +	if (*sel < 0)
> +		return -EINVAL;
> +	return regulator_set_voltage_sel_regmap(rdev, *sel);
> +}

Implement map_voltage.

> +	for_each_child_of_node(nproot, np) {
> +		if (!of_node_cmp(np->name, info->desc.name)) {
> +			config->init_data =
> +				of_get_regulator_init_data(&pdev->dev, np);
> +			config->of_node = np;
> +			break;
> +		}
> +	}

Use of_regulator_match().

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