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regmap: add configurable downshift for addresses

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Add an additional reg_downshift to be applied to register addresses before
any register accesses. An example of a device that uses this is a VSC7514
chip, which require each register address to be downshifted by two if the
access is performed over a SPI bus.

Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Link: https://lore.kernel.org/r/20220313224524.399947-2-colin.foster@in-advantage.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Colin Foster 2022-03-13 15:45:23 -07:00 • committed by Mark Brown
parent 2d2329787b
commit 86fc59ef81
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3
include/linux/regmap.h
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@ -237,6 +237,8 @@ typedef void (*regmap_unlock)(void *);
* @reg_stride: The register address stride. Valid register addresses are a
* multiple of this value. If set to 0, a value of 1 will be
* used.
* @reg_downshift: The number of bits to downshift the register before
* performing any operations.
* @pad_bits: Number of bits of padding between register and value.
* @val_bits: Number of bits in a register value, mandatory.
*
@ -360,6 +362,7 @@ struct regmap_config {
int reg_bits;
int reg_stride;
int reg_downshift;
int pad_bits;
int val_bits;