regcache_reg_needs_sync
bool regcache_reg_needs_sync(struct regmap *map, unsigned int reg,
if (regcache_reg_needs_sync(map, r, v)) {
if (!regcache_reg_needs_sync(map, reg, val))
if (!regcache_reg_needs_sync(map, reg, val))
if (!regcache_reg_needs_sync(map, regtmp, val)) {