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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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GPG Key ID: 24D68B725D5487D0
3 changed files with 9 additions and 0 deletions
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1
drivers/base/regmap/internal.h
View File

@ -31,6 +31,7 @@ struct regmap_format {
size_t buf_size;
size_t reg_bytes;
size_t pad_bytes;
size_t reg_downshift;
size_t val_bytes;
void (*format_write)(struct regmap *map,
unsigned int reg, unsigned int val);

5
drivers/base/regmap/regmap.c
View File

@ -823,6 +823,7 @@ struct regmap *__regmap_init(struct device *dev,
map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
map->format.pad_bytes = config->pad_bits / 8;
map->format.reg_downshift = config->reg_downshift;
map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
config->val_bits + config->pad_bits, 8);
@ -1735,6 +1736,7 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
return ret;
}
reg >>= map->format.reg_downshift;
map->format.format_reg(map->work_buf, reg, map->reg_shift);
regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
map->write_flag_mask);
@ -1905,6 +1907,7 @@ static int _regmap_bus_formatted_write(void *context, unsigned int reg,
return ret;
}
reg >>= map->format.reg_downshift;
map->format.format_write(map, reg, val);
trace_regmap_hw_write_start(map, reg, 1);
@ -2346,6 +2349,7 @@ static int _regmap_raw_multi_reg_write(struct regmap *map,
unsigned int reg = regs[i].reg;
unsigned int val = regs[i].def;
trace_regmap_hw_write_start(map, reg, 1);
reg >>= map->format.reg_downshift;
map->format.format_reg(u8, reg, map->reg_shift);
u8 += reg_bytes + pad_bytes;
map->format.format_val(u8, val, 0);
@ -2673,6 +2677,7 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
return ret;
}
reg >>= map->format.reg_downshift;
map->format.format_reg(map->work_buf, reg, map->reg_shift);
regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
map->read_flag_mask);

3
include/linux/regmap.h
View File

@ -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;