linux-kernel - Re: [PATCH] added support for ams AS3722 regulator

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Message-ID: <20130814173710.GC2401@sirena.org.uk>
Date:	Wed, 14 Aug 2013 18:37:10 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Florian Lobmaier <florian.lobmaier@....com>
Cc:	linux-kernel@...r.kernel.org, lgirdwood@...il.com
Subject: Re: [PATCH] added support for ams AS3722 regulator

On Wed, Aug 14, 2013 at 04:58:02PM +0200, Florian Lobmaier wrote:

> +++ b/drivers/regulator/Kconfig
> @@ -533,5 +533,12 @@ config REGULATOR_AS3711
>  	  This driver provides support for the voltage regulators on the
>  	  AS3711 PMIC
>  
> +config REGULATOR_AS3722
> +        tristate "ams AS3722 PMIC regulators"
> +        depends on MFD_AS3722
> +        help
> +          This driver provides support for the voltage regulators of the
> +          ams AS3722 PMIC.
> +
>  endif

Keep this and the Makefile sorted please.

> + * as3722 ldo0 extended input range (0.825-1.25V)  */
> +static int as3722_ldo0_is_enabled(struct regulator_dev *dev)
> +{
> +	u32 val;
> +	struct as3722 *as3722 = rdev_get_drvdata(dev);
> +
> +	as3722_reg_read(as3722, AS3722_LDOCONTROL0_REG, &val);
> +	return (val & AS3722_LDO0_CTRL_MASK) != 0;
> +}

These all look like you could use the standard regmap helpers.

> +static int as3722_ldo0_list_voltage(struct regulator_dev *dev,
> +				    unsigned selector)
> +{
> +	if (selector >= AS3722_LDO0_VSEL_MAX)
> +		return -EINVAL;
> +
> +	return 800000 + (selector + 1) * 25000;
> +}

This is just a linear mapping, use the standard helpers - the same thing
applies to most of the driver, it seems like there's standard helpers
for most of the enable and voltage management.

> +static int __init as3722_regulator_init(void)
> +{
> +	return platform_driver_register(&as3722_regulator_driver);
> +}
> +
> +subsys_initcall(as3722_regulator_init);

Modern platforms should just be able to register as a normal driver and
use deferred probing to sort out the init order.

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