linux-kernel - Re: [PATCH 3/4] regulator: add voltage selection capability to mc13783 regulators.

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Date:	Sat, 12 Dec 2009 18:22:39 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Alberto Panizzo <maramaopercheseimorto@...il.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Sascha linux-arm <s.hauer@...gutronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel-infradead <linux-arm-kernel@...ts.infradead.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 3/4] regulator: add voltage selection capability to
 mc13783 regulators.

On Sat, Dec 12, 2009 at 05:56:16PM +0100, Alberto Panizzo wrote:
> This patch, complete the mc13783 regulator subsystem driver with 
> voltage selecting capability.
> Main Switches (SW1AB, SW2AB) are not supported yet.
> 
> Signed-off-by: Alberto Panizzo <maramaopercheseimorto@...il.com>

This is broadly OK but there are a number of issues, mostly stylistic
which it would be better to fix.  scripts/checkpatch.pl will catch a lot
of these.

Acked-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>

on the basis that the code is correct, though.

> +static int mc13783_regulator_list_voltage (struct regulator_dev *rdev, unsigned selector)

These long lines really ought to be wrapped, and you've got an extra
space before the ( which isn't the usual coding style.  There's lots of
other odditities with things like this which checkpatch should catch.

> +static int mc13783_get_best_voltage_index(struct regulator_dev *rdev,
> +						int min_uV, int max_uV)
> +{
> +	int reg_id = rdev_get_id(rdev);
> +	int i;
> +	int bestmatch;
> +	int bestindex;
> +
> +	/*
> +	 * Locate the minimum voltage fitting the criteria on
> +	 * this regulator. The switchable voltages are not
> +	 * in strict falling order so we need to check them
> +	 * all for the best match.
> +	 */
> +	bestmatch = INT_MAX;
> +	bestindex = -1;
> +	for (i = 0; i < mc13783_regulators[reg_id].desc.n_voltages; i++) {
> +		if (mc13783_regulators[reg_id].voltages[i] <= max_uV &&
> +		    mc13783_regulators[reg_id].voltages[i] >= min_uV &&
> +		    mc13783_regulators[reg_id].voltages[i] < bestmatch) {
> +			bestmatch = mc13783_regulators[reg_id].voltages[i];
> +			bestindex = i;
> +		}
> +	}

Not that it makes much difference but you could just ignore max_uV until
you're done then check it once at the end since you're selecting for the
lowest matching voltage anyway.

> +	/* If it is a fixed regulator*/
> +	if (mc13783_regulators[id].desc.n_voltages == 1)
> +	{

if (...)  {

though it might be as well to define the fixed voltage regulators
separately with their own get and list functions rather than special
casing like this.

> +	mc13783_lock(priv->mc13783);
> +	ret = mc13783_reg_read( priv->mc13783,
> +				mc13783_regulators[id].vsel_reg, &val);

Extra space after the (.
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