linux-kernel - Re: [RFC] regmap: Add regmap

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Message-ID: <51B4A693.4080503@metafoo.de>
Date:	Sun, 09 Jun 2013 18:00:19 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Srinivas KANDAGATLA <srinivas.kandagatla@...com>
CC:	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] regmap: Add regmap_field APIs

[...]
> +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);
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