linux-kernel - Re: [PATCH 3/4] Regulators: TPS65218: Add Regulator driver for TPS65218 PMIC

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Date:	Tue, 3 Dec 2013 15:16:54 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Keerthy <j-keerthy@...com>
Cc:	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	swarren@...dotorg.org, ijc+devicetree@...lion.org.uk,
	rob@...dley.net, sameo@...ux.intel.com, lee.jones@...aro.org,
	grant.likely@...aro.org, lgirdwood@...il.com,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 3/4] Regulators: TPS65218: Add Regulator driver for
 TPS65218 PMIC

On Tue, Dec 03, 2013 at 12:13:24PM +0530, Keerthy wrote:

> +static int tps65218_ldo1_dcdc3_vsel_to_uv(unsigned int vsel)
> +{
> +	int uV = 0;
> +
> +	if (vsel <= 26)
> +		uV = vsel * 25000 + 900000;
> +	else
> +		uV = (vsel - 26) * 50000 + 1550000;
> +
> +	return uV;
> +}

Use regulator_map_voltage_linear_range() (and similarly for most of the
other functions).

> +static const struct of_device_id tps65218_of_match[] = {
> +	TPS65218_OF_MATCH("ti,tps65218-dcdc1", tps65218_pmic_regs[0]),
> +	TPS65218_OF_MATCH("ti,tps65218-dcdc2", tps65218_pmic_regs[1]),
> +	TPS65218_OF_MATCH("ti,tps65218-dcdc3", tps65218_pmic_regs[2]),
> +	TPS65218_OF_MATCH("ti,tps65218-dcdc4", tps65218_pmic_regs[3]),
> +	TPS65218_OF_MATCH("ti,tps65218-dcdc5", tps65218_pmic_regs[4]),
> +	TPS65218_OF_MATCH("ti,tps65218-dcdc6", tps65218_pmic_regs[5]),
> +	TPS65218_OF_MATCH("ti,tps65218-ldo1", tps65218_pmic_regs[6]),
> +};
> +MODULE_DEVICE_TABLE(of, tps65218_of_match);

Indexing into another array by magic number like this is both error
prone and hard to read.  Either use defined constants or individual
variables for the things being referenced.

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