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regmap: Add support for padding between register and address

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Some devices, especially those with high speed control interfaces, require
padding between the register and the data. Support this in the regmap API
by providing a pad_bits configuration parameter.

Only devices with integer byte counts are supported.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-01-18 10:52:25 +00:00
commit 82159ba8e6
3 changed files with 24 additions and 11 deletions
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2
include/linux/regmap.h
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@ -44,6 +44,7 @@ struct reg_default {
* Configuration for the register map of a device.
*
* @reg_bits: Number of bits in a register address, mandatory.
* @pad_bits: Number of bits of padding between register and value.
* @val_bits: Number of bits in a register value, mandatory.
*
* @writeable_reg: Optional callback returning true if the register
@ -74,6 +75,7 @@ struct reg_default {
*/
struct regmap_config {
int reg_bits;
int pad_bits;
int val_bits;
bool (*writeable_reg)(struct device *dev, unsigned int reg);