On Mon, Aug 06, 2018 at 03:04:44PM +0300, Stefan Popa wrote:

> +	if (!regmap_volatile(map, reg) || !regmap_readable(map, reg)) {
> +		ret = -EINVAL;
> +		goto out_unlock;
> +	}

I suggested having an explicit operation to check if a register supports
this mode of operation when I reviewed an earlier version, I didn't
notice a reply on that?