On Thu, Oct 10, 2019 at 09:42:33AM +0200, Nuno Sá wrote:

> +			/* power on */
> +			ret = regulator_enable(st->iovdd);
> +			if (ret)
> +				return ret;
> +
> +			/* there's no timing constraints before enabling dvdd */
> +			ret = regulator_enable(st->dvdd);
> +			if (ret) {
> +				regulator_disable(st->iovdd);
> +				return ret;
> +			}

You could use regulator_bulk_enable() here (and similarly on
disable) but it doesn't fundamentally matter - they do guarantee
that they'll do things in sequence, though they don't wait for
the ramp to complete before kicking off the next enable in the
sequence which can be an issue for some hardware.