Unverified Commit fd80df35 authored by Charles Keepax's avatar Charles Keepax Committed by Mark Brown
Browse files

regcache: Add support for sorting defaults arrays 



The defaults array in regcache must be sorted into ascending register
address order, because binary search is used to locate values in
the array. Add a helper to sort the register defaults array which
can be useful for systems that dynamically create a defaults array
based on external information.

Signed-off-by: default avatarCharles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250217140159.2288784-2-ckeepax@opensource.cirrus.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a54a659f

drivers/base/regmap/regcache.c

+31 −0
Original line number Diff line number Diff line
@@ -21,6 +21,37 @@ static const struct regcache_ops *cache_types[] = { 
	&regcache_flat_ops,

};



static int regcache_defaults_cmp(const void *a, const void *b)

{

	const struct reg_default *x = a;

	const struct reg_default *y = b;



	if (x->reg > y->reg)

		return 1;

	else if (x->reg < y->reg)

		return -1;

	else

		return 0;

}



static void regcache_defaults_swap(void *a, void *b, int size)

{

	struct reg_default *x = a;

	struct reg_default *y = b;

	struct reg_default tmp;



	tmp = *x;

	*x = *y;

	*y = tmp;

}



void regcache_sort_defaults(struct reg_default *defaults, unsigned int ndefaults)

{

	sort(defaults, ndefaults, sizeof(*defaults),

	     regcache_defaults_cmp, regcache_defaults_swap);

}

EXPORT_SYMBOL_GPL(regcache_sort_defaults);



static int regcache_hw_init(struct regmap *map)

{

	int i, j;

include/linux/regmap.h

+7 −0
Original line number Diff line number Diff line
@@ -1352,6 +1352,7 @@ bool regmap_can_raw_write(struct regmap *map); 
size_t regmap_get_raw_read_max(struct regmap *map);

size_t regmap_get_raw_write_max(struct regmap *map);



void regcache_sort_defaults(struct reg_default *defaults, unsigned int ndefaults);

int regcache_sync(struct regmap *map);

int regcache_sync_region(struct regmap *map, unsigned int min,

			 unsigned int max);
@@ -2043,6 +2044,12 @@ static inline bool regmap_might_sleep(struct regmap *map) 
	return true;

}



static inline void regcache_sort_defaults(struct reg_default *defaults,

					  unsigned int ndefaults)

{

	WARN_ONCE(1, "regmap API is disabled");

}



static inline int regcache_sync(struct regmap *map)

{

	WARN_ONCE(1, "regmap API is disabled");