On Tue, Mar 24, 2015 at 01:08:03PM +0100, Markus Pargmann wrote:
> The driver probe fails when there is a subdevice without platform_data.
> Add a error message so it is clear what failed.

...

>  	for (i = 0; i < pdata->num_subdevs; i++) {
> -		if (!pdata->subdevs[i].platform_data)
> +		if (!pdata->subdevs[i].platform_data) {
> +			dev_err(dev, "No data for %d regulator\n", i);
>  			return -EINVAL;
> +		}

Why is the platform data mandatory?  In general the goal is that a
regulator driver should be able to probe with no platform data.