Re: [RFC] regmap: Add regmap_field APIs

[Lars-Peter Clausen <lars@metafoo.de>]

[...]
> +int regmap_field_write(struct regmap_field *field, unsigned int val)
> +{
> +	int field_bits;
> +	unsigned int reg_mask;
> +	field_bits = field->msb - field->lsb + 1;
> +	reg_mask = ((BIT(field_bits) - 1) << field->lsb);
> +	return regmap_update_bits(field->regmap, field->reg,
> +				reg_mask, val << field->lsb);

Considering that you'd do the same calculations over and over again it would
probably make more sense store the mask rather than the msb in the struct

> +}
> +EXPORT_SYMBOL_GPL(regmap_field_write);