Revert "regmap: Allow installing custom reg_update_bits function"

This reverts commit 7741c373.

drivers/base/regmap/internal.h

@@ -98,9 +98,6 @@ struct regmap {
 
 	int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
 	int (*reg_write)(void *context, unsigned int reg, unsigned int val);
-	int (*reg_update_bits)(void *context, unsigned int reg,
-			       unsigned int mask, unsigned int val,
-			       bool *change, bool force_write);
 
 	bool defer_caching;
 

drivers/base/regmap/regmap.c

@@ -619,7 +619,6 @@ struct regmap *__regmap_init(struct device *dev,
 		goto skip_format_initialization;
 	} else {
 		map->reg_read  = _regmap_bus_read;
-		map->reg_update_bits = bus->reg_update_bits;
 	}
 
 	reg_endian = regmap_get_reg_endian(bus, config);
@@ -2510,30 +2509,6 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
 	int ret;
 	unsigned int tmp, orig;
 
-	if (map->reg_update_bits) {
-		ret = map->reg_update_bits(map->bus_context, reg, mask, val,
-					   change, force_write);
-		if (ret != 0)
-			return ret;
-
-		/* Fix up the cache by read/modify/write */
-		if (!map->cache_bypass && !map->defer_caching) {
-			ret = regcache_read(map, reg, &orig);
-			if (ret != 0)
-				return ret;
-
-			tmp = orig & ~mask;
-			tmp |= val & mask;
-
-			ret = regcache_write(map, reg, tmp);
-			if (ret != 0)
-				return ret;
-			if (map->cache_only)
-				map->cache_dirty = true;
-		}
-		return ret;
-	}
-
 	ret = _regmap_read(map, reg, &orig);
 	if (ret != 0)
 		return ret;

include/linux/regmap.h

@@ -296,9 +296,6 @@ typedef int (*regmap_hw_reg_read)(void *context, unsigned int reg,
 				  unsigned int *val);
 typedef int (*regmap_hw_reg_write)(void *context, unsigned int reg,
 				   unsigned int val);
-typedef int (*regmap_hw_reg_update_bits)(void *context, unsigned int reg,
-					 unsigned int mask, unsigned int val,
-					 bool *change, bool force_write);
 typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
 typedef void (*regmap_hw_free_context)(void *context);
 
@@ -338,7 +335,6 @@ struct regmap_bus {
 	regmap_hw_gather_write gather_write;
 	regmap_hw_async_write async_write;
 	regmap_hw_reg_write reg_write;
-	regmap_hw_reg_update_bits reg_update_bits;
 	regmap_hw_read read;
 	regmap_hw_reg_read reg_read;
 	regmap_hw_free_context free_context;