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regmap: add regmap_update_bits() helper

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Add the regmap_update_bits() to simply the read/modify/write of registers
in a single command. The function is taken from Linux regmap
implementation.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Neil Armstrong 2018-04-27 11:56:14 +02:00 committed by Tom Rini
parent dbe2fcb87d
commit 285cbcf97f
2 changed files with 24 additions and 0 deletions
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14
drivers/core/regmap.c
View File

@ -132,3 +132,17 @@ int regmap_write(struct regmap *map, uint offset, uint val)
return 0;
}
int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
{
uint reg;
int ret;
ret = regmap_read(map, offset, &reg);
if (ret)
return ret;
reg &= ~mask;
return regmap_write(map, offset, reg | val);
}

10
include/regmap.h
View File

@ -42,6 +42,16 @@ int regmap_read(struct regmap *map, uint offset, uint *valp);
#define regmap_read32(map, ptr, member, valp) \
regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp)
/**
* regmap_update_bits() - Perform a read/modify/write using a mask
*
* @map: The map returned by regmap_init_mem*()
* @offset: Offset of the memory
* @mask: Mask to apply to the read value
* @val: Value to apply to the value to write
*/
int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val);
/**
* regmap_init_mem() - Set up a new register map that uses memory access
*