regmap: Add helper function for checking if a register range is volatile

We already have the same code for checking whether a register range is volatile
in two different places. Instead of duplicating it once more  add a small helper
function for checking whether a register range is voltaile.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/base/regmap/regmap.c

@@ -64,6 +64,18 @@ bool regmap_precious(struct regmap *map, unsigned int reg)
 	return false;
 }
 
+static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
+	unsigned int num)
+{
+	unsigned int i;
+
+	for (i = 0; i < num; i++)
+		if (!regmap_volatile(map, reg + i))
+			return false;
+
+	return true;
+}
+
 static void regmap_format_4_12_write(struct regmap *map,
 				     unsigned int reg, unsigned int val)
 {
@@ -483,15 +495,11 @@ EXPORT_SYMBOL_GPL(regmap_read);
 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 		    size_t val_len)
 {
+	size_t val_count = val_len / map->format.val_bytes;
 	int ret;
-	int i;
-	bool vol = true;
-
-	for (i = 0; i < val_len / map->format.val_bytes; i++)
-		if (!regmap_volatile(map, reg + i))
-			vol = false;
 
-	WARN_ON(!vol && map->cache_type != REGCACHE_NONE);
+	WARN_ON(!regmap_volatile_range(map, reg, val_count) &&
+		map->cache_type != REGCACHE_NONE);
 
 	mutex_lock(&map->lock);
 
@@ -519,16 +527,11 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
 {
 	int ret, i;
 	size_t val_bytes = map->format.val_bytes;
-	bool vol = true;
+	bool vol = regmap_volatile_range(map, reg, val_count);
 
 	if (!map->format.parse_val)
 		return -EINVAL;
 
-	/* Is this a block of volatile registers? */
-	for (i = 0; i < val_count; i++)
-		if (!regmap_volatile(map, reg + i))
-			vol = false;
-
 	if (vol || map->cache_type == REGCACHE_NONE) {
 		ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
 		if (ret != 0)