From aa2ff9dbaeddabb5ad166db5f9f1a0580a8bbba8 Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Thu, 28 May 2020 17:45:02 +0200 Subject: 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 Link: https://lore.kernel.org/r/20200528154503.26304-2-brgl@bgdev.pl Signed-off-by: Mark Brown --- drivers/base/regmap/regmap.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/base') 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; -- cgit v1.2.3