diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-05-28 17:45:02 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-05-29 14:00:42 +0100 |
| commit | aa2ff9dbaeddabb5ad166db5f9f1a0580a8bbba8 (patch) | |
| tree | 5c710c63c6e650e003dfd8e6ed088e3149fd984f /drivers/base | |
| parent | 8f3d9f354286745c751374f5f1fcafee6b3f3136 (diff) | |
| download | linux-aa2ff9dbaeddabb5ad166db5f9f1a0580a8bbba8.tar.bz2 | |
regmap: provide helpers for simple bit operations
In many instances regmap_update_bits() is used for simple bit setting
and clearing. In these cases the last argument is redundant and we can
hide it with a static inline function.
This adds three new helpers for simple bit operations: set_bits,
clear_bits and test_bits (the last one defined as a regular function).
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Link: https://lore.kernel.org/r/20200528154503.26304-2-brgl@bgdev.pl
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 59f911e57719..4ad5c5adc0a3 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -2936,6 +2936,28 @@ int regmap_update_bits_base(struct regmap *map, unsigned int reg, } EXPORT_SYMBOL_GPL(regmap_update_bits_base); +/** + * regmap_test_bits() - Check if all specified bits are set in a register. + * + * @map: Register map to operate on + * @reg: Register to read from + * @bits: Bits to test + * + * Returns -1 if the underlying regmap_read() fails, 0 if at least one of the + * tested bits is not set and 1 if all tested bits are set. + */ +int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits) +{ + unsigned int val, ret; + + ret = regmap_read(map, reg, &val); + if (ret) + return ret; + + return (val & bits) == bits; +} +EXPORT_SYMBOL_GPL(regmap_test_bits); + void regmap_async_complete_cb(struct regmap_async *async, int ret) { struct regmap *map = async->map; |